Rosemount 3095FB Reference Manual

Reference Manual

00809-0100-4738, Rev DA
May 2006

Rosemount 3095FB

™

MultiVariable

with Modbus® Protocol

Transmitter

www.rosemount.com

Reference Manual

00809-0100-4738, Rev DA
May 2006

Rosemount 3095FB

Rosemount 3095FB
Multivariable
Modbus

Rosemount 3095FB Software Revision 110
Rosemount 3095FB Configurator User Interface Software Revision 2.00

Read this manual before working with the product. For personal and system
safety, and for optimum product performance, make sure you thoroughly
understand the contents before installing, using, or maintaining this product.

Within the United States, Rosemount Inc. has two toll-free assistance numbers.

Customer Central: 1-800-999-9307 (7:00 a.m. to 7:00 p.m. CST)

North American 1-800-654-7768 (24 hours a day – Includes Canada)
Response Center: Equipment service needs.

For equipment service or support needs outside the United States, contact your
local Rosemount representative.

™

Protocol

Technical support, quoting, and order-related questions.

™

Transmitter with

NOTICE

The products described in this document are NOT designed for
nuclear-qualified applications.

Using non-nuclear qualified products in applications that require
nuclear-qualified hardware or products may cause inaccurate readings.

For information on Rosemount nuclear-qualified products, contact your local
Rosemount Sales Representative.

Rosemount 3095FB Multivariable Transmitter with Modbus Protocol may be protected by one or more of the
following U.S. Patent Nos. 4,370,890; 4,612,812; 4,791,352; 4,798,089; 4,818,994; 4,833,922; 4,866,435;
4,926,340; 5,028,746; Des. 358,782. MEXICO PATENTADO NO. 154961.
Other U.S. and foreign patents issued and pending.

Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.
Coplanar and Multivariable are trademarks of Rosemount Inc.
Hastelloy C-276 is a registered trademark of Cabot Corp.
Microsoft and Windows are registered trademarks of Microsoft Corp.

COVER PHOTO: 3095\063AB.tif

SNF-0004

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Reference Manual

00809-0100-4738, Rev DA
May 2006

Rosemount 3095FB

Table of Contents

SECTION 1
Introduction

SECTION 2
Installation

Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Section 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Section 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Section 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Section 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Section 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Appendix C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Mechanical Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Review Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Mount the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Process Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Consider Housing Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Set Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

RTD Assembly (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Connect Wiring and Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Hazardous Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Grounding the Transmitter Case . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Rosemount 305 Integral Manifold. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

Integral Manifold Installation Procedure . . . . . . . . . . . . . . . . . . . 2-20

Integral Manifold Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

SECTION 3
Modbus
Communication

SECTION 4
Operation

Suggestions and Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Installation and Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Navigation & Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Menu Categories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Hot Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Bench Configuration (Standard) . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Bench Calibration Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Field Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

User Interface Software Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

File Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

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Rosemount 3095FB

Transmitter Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Maintenance Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Diagnostics Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-20

View Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

Help Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

SECTION 5
Troubleshooting

APPENDIX A
Specifications and
Reference Data

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Communication problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

Alarms and Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

Remove the transmitter from Service . . . . . . . . . . . . . . . . . . . . . . .5-6

Remove the Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Remove the Electronics Board . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

Removing the Sensor Module from the Electronics Housing . . . . . 5-7

Reassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Attach the Electronics Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10

Install the Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Reassembling the Process Sensor Body . . . . . . . . . . . . . . . . . . . 5-10

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Differential Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Absolute / Gage Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Process Temperature (RTD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7

Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9

Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12

APPENDIX B
Product
Certifications

APPENDIX C
3095FB Modbus
Integration Guide

Approved Manufacturing Locations . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

European Directive Information . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Hazardous Locations Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

North American Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

European Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Approval Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Factory Mutual (FM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Canadian Standards Association (CSA) . . . . . . . . . . . . . . . . . . . . B-6

General Protocol Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Process Variable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Other Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

TOC-2

Reference Manual

00809-0100-4738, Rev DA
May 2006

Section 1 Introduction

Rosemount 3095FB

USING THIS MANUAL This manual provides installation, configuration, calibration, troubleshooting,

and maintenance instructions for the Rosemount
Transmitter with Modbus
3095FB Configurator User Interface Software. This manual consists of the
following chapters:

™

Protocol and for its operation with the Rosemount

®

3095FB Multivariable™

Section 2 Installation

• Install the 3095FB

• Installation flowchart

• Transmitter configuration data

• Installation considerations

• Field installation

• Options and accessories

Section 3 RTU Communication

Rosemount 3095FB Modbus Protocol Guide, Revision F.

Section 4 Operation

• How to use the configuration software

• Installing the software onto a personal computer

• Establishing communications

• Configuring the transmitter

• Creating a configuration file

• Calibrating the transmitter

• Explains each configurator software menu

Section 5 Transmitter Maintenance and Troubleshooting

• Troubleshooting instructions for dealing with potential mechanical or
electrical difficulties.

Section 6 Specifications and Reference Data

• Specification data

• Spare parts information

Appendix A Approvals

• Factory Mutual (FM) certified drawings

• Canada Standards Association (CSA) certified drawings.

Appendix B Product Certifications

Appendix C MODBUS Integration Guide

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Rosemount 3095FB

Reference Manual

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May 2006

1-2

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Rosemount 3095FB

Section 2 Installation

OVERVIEW The information in this section covers installation considerations for the

3095FB MultiVariable Transmitter with Modbus protocol. A Quick Installation
Guide (document number 00825-0100-4738) is shipped with every transmitter
to describe basic pipe-fitting and wiring procedures for initial installation.

SAFETY MESSAGES Procedures and instructions in this section may require special precautions to

ensure the safety of the personnel performing the operation. Review all safety
messages covered in this manual before continuing with the operation.

Warnings

Explosions can result in death or serious injury.

• Do not remove the transmitter covers in explosive environments when the circuit is
live.

• Fully engage both transmitters covers to meet explosion-proof requirements.

• Verify that the operating atmosphere of the transmitter is consistent with the
appropriate hazardous locations certifications.

Electrical shock can result in death or serious injury.

• Avoid contact with the leads and terminals.

Process leaks could result in death or serious injury.

• Install and tighten all four flange bolts before applying pressure.

• Do not attempt to loosen or remove flange bolts while the transmitter is in service.

Replacement equipment or spare parts not approved by Rosemount, Inc. for use as
spare parts could reduce the pressure retaining capabilities of the transmitter and may
render the instrument dangerous.

• Use only bolts supplied or sold by Rosemount, Inc. as spare parts.

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Rosemount 3095FB

Reference Manual

00809-0100-4738, Rev DA

May 2006

Improper assembly of manifolds to traditional housing can damage sensor module.

• For safe assembly of manifold to traditional flange, bolts must break back plane of
flange web (i.e. bolt hold) but must not contact module housing.

GENERAL
CONSIDERATIONS

MECHANICAL
CONSIDERATIONS

Measurement accuracy depends upon proper installation of the transmitter
and impulse piping. Mount the transmitter close to the process and use
minimal impulse piping to achieve best accuracy. Keep in mind the need for
easy access, personnel safety, practical field calibration, and a suitable
transmitter environment. Install the transmitter to minimize vibration, shock,
and temperature fluctuation.

IMPORTANT

Install the enclosed pipe plug in unused conduit openings with a minimum of
five threads engaged to comply with Explosion-Proof requirements. The
transmitter is shipped with the plug installed on transmitters ordered with CSA
Explosion-Proof approval.

“Dimensional Drawings” beginning on page A-5 show dimensional drawings.
Figure 2-4 on page 2-9 shows installation examples.

NOTE

For steam service or for applications with process temperatures greater than
the limits of the transmitter, do not blow down impulse piping through the
transmitter. Flush lines with the blocking valves closed and refill lines with
water before resuming measurement.

ENVIRONMENTAL
CONSIDERATIONS

2-2

NOTE

When the transmitter is mounted on its side, position the Coplanar flange to
ensure proper venting or draining. Mount the flange as shown in Figure 2-4 on
page 2-9, keeping drain/vent connections on the bottom for gas service and
on the top for liquid service.

The following guidelines can help optimize transmitter performance. Mount
the transmitter to minimize ambient temperature changes, vibration,
mechanical shock, and external contact with corrosive materials. Appendix A:
Range and Sensor Limits on page A-1 lists the transmitter temperature
operating limits.

Reference Manual

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May 2006

Rosemount 3095FB

INSTALLATION

Figure 2-1 details the full procedure for installing a new 3095FB.

PROCEDURES

Figure 2-1. Rosemount 3095FB Installation Flowchart

START

Unpack the
Rosemount

3095FB

Review the

3095FB Product

Manual

Hazardous

Location

?

No

Yes

Review Appendix B

A

BENCH

CONFIGURE

Connect Bench

Power Supply

Connect Personal

Computer

Perform Bench

Configuration

Tasks

B

FIELD

INSTALLATION

Review Installation

Considerations

Mount

Transmitter and

Install Bolts

(Optional) Install

RTD Assembly

Make Field Wiring

Connections

Bench

Configure

?

No

B

Yes

A

(Optl.) Perform

Bench Calibration

Tasks

B

Bench

Configuration

Performed

?

Yes

(Optl.) Perform

Field Calibration

Tas ks

DONE

No

Perform

Configuration

Tasks

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Rosemount 3095FB

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May 2006

Review Installation
Considerations

When choosing an installation location and position, take into account the
need for access to the transmitter. For dimensional drawing information see
page A-6.

Process Flange Orientation

Mount the process flanges with sufficient clearance for process connections.
For safety reasons, place the drain/vent valves so the process fluid is directed
away from you when the vents are used. In addition, consider the possible
need for a testing or calibration input.

Housing Rotation

See “Consider Housing Rotation” on page 2-11.

Terminal Side of Electronics Housing

Mount the transmitter so that the terminal side is accessible. A 0.75-inch (19
mm) clearance is required for cover removal. Use a conduit plug on the
unused side of the conduit opening.

Circuit Side of Electronics Housing

Provide 0.75 inches (19 mm) clearance if possible for cover removal. Three
inches of clearance is required for cover removal if a display is installed.

Cover Installation

Always install the electronics housing covers metal-to-metal to ensure a
proper seal.

2-4

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Rosemount 3095FB

May 2006

Mount the Transmitter Figure 2-2 illustrates a typical 3095 installation site. Major components of the

installation are identified in these figures.

Figure 2-2. Typical Rosemount 3095FB Installation Site

3095FB

RTD Connector

Process

Connections

Conduit Opening
for Connections
to RTU and
Power Supply

RTD Assembly

Table 2-1. Transmitter Weight

RTD Cable

Flow

3095-3095f22a

The 3095FB transmitter total weight varies depending on the components
ordered (see Table 2-1). This weight must be securely supported.

Component Weight

3095FB Without Options 6 lb (2,7 kg)
LCD Meter for Aluminum Housing 0.5 lb (0,2 kg)
SST Mounting Bracket for Coplanar Flange 1.0 lb (0,5 kg)
12 ft (3,66 m) cable 0.5 lb (0,2 kg)
24 ft (7,32 m) cable 2.2 lb (1,0 kg)

Mounting Brackets

Optional mounting brackets available with the 3095FB facilitate mounting to a
panel, wall, or 2-inch pipe. The bracket option for use with the Coplanar flange
is 316 SST with 316 SST bolts. Figure 2-3 shows bracket dimensions and
mounting configurations for this option. When installing the transmitter to one
of the mounting brackets, torque the bolts to 125 in-lb.

2-5

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NOTE

Most transmitters are calibrated in the horizontal position. Mounting the
transmitter in any other position will shift the zero point to the equivalent
amount of liquid head caused by the varied mounting position. To reset zero
point, refer to “Sensor Trim” on page 4-16.

Mounting Bolts

The following guidelines have been established to ensure a tight flange,
adapter, or manifold seal. Use only bolts supplied with the transmitter or sold
by Rosemount Inc. as a spare part to the Rosemount 3095FB transmitter.

The Rosemount 3095FB is shipped with the Coplanar flange installed with
four 1.75-inch flange bolts. The following bolts also are supplied to facilitate
other mounting configurations:

• Four 2.25-inch manifold/flange bolts for mounting the Coplanar flange
on a three-valve manifold. In this configuration, the 1.75-inch bolts may
be used to mount the flange adapters to the process connection side of
the manifold.

• (Optional) If flange adapters are ordered, four 2.88-inch flange/adapter
bolts for mounting the flange adapters to the Coplanar flange.

Figure 2-3 shows the optional mounting bracket and mounting configurations.

Stainless steel bolts supplied by Rosemount Inc. are coated with a lubricant to
ease installation. Carbon steel bolts do not require lubrication. No additional
lubricant should be applied when installing either type of bolt. Bolts supplied
by Rosemount Inc. are identified by their head markings:

2-6

Rosemount 3095FB

Figure 2-3. Optional Mounting Brackets and Mounting Configurations

Description Qty.

Flange bolts
Flange/adapter bolts
Manifold/flange bolts

4
4
4

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May 2006

Size
in. (mm)

1.75 (44)

2.88 (73)

2.25 (57)

1.75 (44) x 4

TRANSMITTER WITH
FLANGE BOLTS

2.88 (73) x 4

TRANSMITTER WITH
OPTIONAL FLANGE ADAPTERS
AND FLANGE/ADAPTER BOLTS

2.25 (57) x 4

1.75 (44) x 4

3095-3095D05M, 3095C05A, fieldbus\3095\3095a29A

TRANSMITTER WITH 3-VALVE MANIFOLD
MANIFOLD/FLANGE BOLTS
FLANGE ADAPTERS
AND FLANGE/ADAPTER BOLTS

NOTE
Dimensions are in inches (millimeters)

2-7

Rosemount 3095FB

Reference Manual

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May 2006

Mounting Requirements

Refer to figure 2-4 for examples of the following mounting considerations:

Liquid Flow Measurement

• Place taps to the side of the line to prevent sediment deposits on the
transmitter’s process isolators.

• Mount the transmitter beside or below the taps so gases can vent into
the process line.

• Mount drain/vent valve upward to allow gases to vent.

Gas Flow Measurement

• Place taps in the top or side of the line.

• Mount the transmitter beside or above the taps so liquid will drain into
the process line.

Steam Flow Measurement

• Place taps to the side of the line.

• Mount the transmitter below the taps to ensure that the impulse piping
will stay filled with condensate.

• Fill impulse lines with water to prevent the steam from contacting the
transmitter directly and to ensure accurate measurement start-up.

NOTE

In steam or other elevated temperature services, it is important that
temperatures at the coplanar process flanges not exceed 250 °F (121 °C) for
transmitters with silicone fill or 185 °F (85 °C) for inert fill.

2-8

Rosemount 3095FB

Figure 2-4. Example Installations

Flow

GAS SERVICE

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May 2006

STEAM
SERVICE

Flow

LIQUID SERVICE

Flow

Process Connections The 3095 process connections on the transmitter flange are 1/4–18 NPT.

Flange adapter unions with 1/2–14 NPT connections are available as options.
These are Class 2 threads; use your plant-approved lubricant or sealant when
making the process connections. The process connections on the transmitter
flange are on 2
five-valve manifold. By rotating one or both of the flange adapters, connection
centers of 2, 2

Install and tighten all four flange bolts before applying pressure or process
leakage will result. When properly installed, the flange bolts will protrude
through the top of the module housing. Do not attempt to loosen or remove
the flange bolts while the transmitter is in service.

1

/8-inch (54-mm) centers to allow direct mounting to a three- or

1

/8, or 21/4 inches (51, 54, or 57 mm) may be obtained.

3095\3095b03b, 3095d03b

2-9

Rosemount 3095FB

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May 2006

To install adapters to a Coplanar flange, perform the following procedure:

1. Remove the flange bolts.

2. Leaving the flange in place, move the adapters into position with the

O-ring installed.

3. Clamp the adapters and the Coplanar flange to the transmitter

module using the larger of the bolts supplied.

4. Tighten the bolts. Refer to “Mounting Bolts” on page 2-6 for torque

specifications.

Failure to install proper flange adapter O-rings can cause process leaks, which can
result in death or serious injury.

The two flange adapters are distinguished by unique O-ring grooves. Only use the
O-ring that is designed for its specific flange adapter, as shown below.

ROSEMOUNT 3051S/ 3051/3001/3095/2024

Flange Adapter

O-ring

3051S 3051C 2024

ROSEMOUNT 1151

Refer to the Spare Parts list on page A-9 for the correct part numbers of the flange
adapters and O-rings designed for Rosemount 3051 transmitters.

Teflon Based

Elastomer

Flange Adapter

O-ring

3051-0569A01A

Teflon

Elastomer

When compressed, Teflon® O-rings tend to cold flow, which aids in their
sealing capabilities. Whenever you remove flanges or adapters, visually
inspect the Teflon O-rings. Replace them if there are any signs of damage,
such as nicks or cuts. If they are undamaged, you may reuse them. If you
replace the O-rings, retorque the flange bolts after installation to compensate
for cold flow.

2-10

Impulse Piping

The piping between the process and the transmitter must accurately transfer
the pressure to obtain accurate measurements. There are five possible
sources of error: pressure transfer, leaks, friction loss (particularly if purging is
used), trapped gas in a liquid line, liquid in a gas line, and density variations
between the legs.

Rosemount 3095FB

Reference Manual

00809-0100-4738, Rev DA

May 2006

The best location for the transmitter in relation to the process pipe depends on
the process itself. Use the following guidelines to determine transmitter
location and placement of impulse piping:

• Keep impulse piping as short as possible.

• For liquid service, slope the impulse piping at least 1 inch per foot (8
cm per m) upward from the transmitter toward the process connection.

• For gas service, slope the impulse piping at least 1 inch per foot (8 cm
per m) downward from the transmitter toward the process connection.

• Avoid high points in liquid lines and low points in gas lines.

• Make sure both impulse legs are the same temperature.

• Use impulse piping large enough to avoid friction effects and blockage.

• Vent all gas from liquid piping legs.

• When using a sealing fluid, fill both piping legs to the same level.

• When purging, make the purge connection close to the process taps
and purge through equal lengths of the same size pipe. Avoid purging
through the transmitter.

• Keep corrosive or hot (above 250 °F [121 °C]) process material out of
direct contact with the sensor module and flanges.

• Prevent sediment deposits in the impulse piping.

• Keep the liquid head balanced on both legs of the impulse piping.

• Avoid conditions that might allow process fluid to freeze within the
process flange.

Consider Housing
Rotation

The electronics housing can be rotated up to 180 degrees (left or right) to
improve field access or to better view the optional LCD display. To rotate the
housing, perform the following procedure:

1. Loosen the housing rotation set screw using a 5/64-in. hex wrench.

2. Turn the housing up to 180 degrees to the left or right of its original

3. Retighten the housing rotation set screw.

Set Jumpers Security

You can prevent changes to the transmitter configuration data with the write
protection jumper. Security is controlled by the security (write protect) jumper
located on the electronics board or display face. Position the jumper on the
transmitter circuit board in the “ON” position to prevent accidental or
deliberate change of configuration data.

If the transmitter write protection jumper is in the “ON” position, the transmitter
will not accept any “writes” to its memory. Configuration changes, such as
digital trim and reranging, cannot take place when the transmitter security is
on.

AC Termination (AC)

(as shipped) position. Do not rotate the housing more than 180
degrees without first performing a disassembly procedure (see
“Disassembly Procedures” on page 5-5). Over-rotation will sever the
electrical connection between the sensor module and the electronics
module.

2-11

The RS-485 bus needs to be terminated once at both ends, and should not be
terminated elsewhere on the bus. Setting the AC TERMINATION (AC) switch
to ON provides AC bus termination.

Rosemount 3095FB

Reference Manual

00809-0100-4738, Rev DA

May 2006

NOTE

The RTU may already provide one RS-485 bus termination.

Pull-down (B) and Pull-up (A)

These switches are used to put the RS-485 bus into the idle state. Set these
switches either to both ON (idle state), or to both OFF (lets the bus float). If a
transmitter has multiple communication errors, set these switches to ON (idle
state).

NOTE

Only one device on an RS-485 bus should set the bus to the idle state. In
some installations, the RTU might maintain the bus in the idle state when the
RS-485 bus is inactive.

Baud Rate (S1 and S2)

Table 2-2 identifies four available baud rates for RS-485 Modbus
communications.

Table 2-2. Baud Rate Settings

S1 S2 Baud Rate

OFF OFF 1200

ON OFF 2400

OFF ON 4800

ON ON 9600

Configuring RS485 and Security Jumpers

When shipped from the factory, the RS-485 switches are all set to off, and the
baud rate switches are set to 9600 (see Table 2-2).

To reposition the jumpers, follow the procedure described below.

1. If the transmitter is installed, remove power.

2. Remove the housing cover opposite the field terminal side. Do not

remove the transmitter covers in explosive atmospheres when the
circuit is live.

3. Remove the LCD meter if present.

4. Locate the switches on the output electronics board (see Figure 2-5),

and then move the switch to the desired setting.

5. Reattach the transmitter cover. Transmitter covers must be fully

engaged to meet Explosion-Proof requirements.

2-12

Rosemount 3095FB

Figure 2-5. Output Board Switches

Reference Manual

00809-0100-4738, Rev DA

May 2006

OFF

ON
OFF

ON

<
<

Real-Time
Clock
Battery
Jumper

>
>

ON
OFF

RS-485
Configuration

SECURITY

AC (B ) (A)

ON
OFF

S1 S2

Baud
Rate

OUTPUT ELECTRONICS BOARD

RTD Assembly (Optional) The Rosemount 3095FB MultiVariable Transmitter is compatible with the

Series 68 or Series 78 RTD Assembly.

NOTE

To meet ISSep/CENELEC Flameproof certification, only European
Flameproof Cable Assemblies (Process Temperature Input Codes A, B, or C)
may be used for RTD cable installation.

3095-065AB

2-13

RTD Installation Procedure

All RTD Cable Assemblies use the 3095 RTD Cable Connector.

Rosemount 3095FB

Identify the type of cable being used, and follow the installation steps specific
to the type of cable.

Installing an Armored Shielded RTD Cable

Figure 2-6 details a standard armored shielded RTD cable.

Figure 2-6. Armored Shielded RTD Cable

Washer

Rubber Bushing
(Slide stop to edge

00809-0100-4738, Rev DA

• Armored Shielded RTD Cable

• Shielded RTD Cable (intended for conduit use)

• CENELEC Flameproof RTD Cable

Compression

Cap

Fitting

Reference Manual

May 2006

Connect to

transmitter

3

/4 to 1/2–in. NPT
Adapter
(Screws into RTD
Connection Head)

Compression Fitting

Figure 2-7. Shielded RTD Cable

Cap

Brushing

1. Fully engage the black cable connector to the 3095 RTD connector
(figure 2-9).

2. Tighten the cable adapter until metal contacts metal (figure 2-10).

3. Install the compression fitting

4. Use pliers to tighten the cap onto the compression fitting (figure 2-11).

Installing a Shielded RTD Cable (intended for conduit use)

Figure 2-7 details a standard shielded RTD cable.

Cable Adapter 1/2–14 NPT

Black Cable Connector

1. Fully engage the black cable connector to the 3095 RTD connector
(figure 2-9).

2. Tighten the cable adapter until metal contacts metal (figure 2-10).

3095-0020D01A

2-14

Installing a CENELEC Flameproof RTD Cable

Figure 2-8 details a CENELEC flameproof RTD cable.

Rosemount 3095FB

Figure 2-8. CENELEC Flameproof RTD Cable

Reference Manual

00809-0100-4738, Rev DA

May 2006

1. Fully engage the black cable connector to the 3095 RTD connector
(figure 2-9).

2. Tighten the cable adapter and cable gland until metal contacts metal
(figure 2-10).

Figure 2-9. Engaging the Black Cable Connector

RTD Cable Gland CM20

Cable Adapter

Cable Gland

Black Cable Connector

FIGURE 2-10. Tightening the Cable Adapter

2-15

Rosemount 3095FB

Figure 2-11. Tightening the Cap

Reference Manual

00809-0100-4738, Rev DA

May 2006

Connecting the RTD to the Assembly

Make all necessary wiring connections inside the RTD Flat Connection Head
as explained in the sensor wiring instructions included with the RTD.

Figure 2-12 illustrates a typical wiring configuration of the Rosemount RTD
cable assembly with a 4-wire RTD.

Figure 2-12. RTD Sensor Wiring Diagram

RTD Cable Assembly Wires

White

White

Red

Red

A

A
B
B

3095\3095_23A.eps

Connect Wiring and
Power Up

2-16

The transmitter terminal block is in the compartment of the electronics
housing labeled “FIELD TERMINALS.” The other compartment contains the
transmitter electronics module.

Refer to figure 2-13 to assist in wiring connections.

Rosemount 3095FB

Reference Manual

00809-0100-4738, Rev DA

May 2006

For explosion-proof installations, wiring connections must be made per Appendix B.
For ALL installations, wiring connections must be made in accordance with local or
national installation codes such as the NEC NFPA 70.

NOTES

• Do not run field wiring in conduit or open trays with other
non-transmitter power wiring, or near heavy electrical equipment.

• Shielded wiring is not required, but twisted pairs should be used for
best results. Twisted pair is required for RS-485 bus wiring.

• Runs under 1000 feet should be AWG 22 or larger. Runs from 1000 to
4000 feet should be AWG 20 or larger.

• Wiring should not exceed AWG 16.

• For connections in ambient temperatures above 140 °F (60 °C), use
wiring rated for at least 194 °F (90 °C).

• All connections should be made before applying power to the device.

Incorrect field wiring connections may damage the Rosemount 3095FB. Do not connect
power wiring to the RS-485 terminals.

To make connections, perform the following procedure:

1. Remove the housing cover on the side marked “FIELD TERMINALS.”

Do not remove the cover in explosive atmospheres when the circuit is
live. All power to the transmitter is supplied over the signal wiring.

2. Connect the lead that originates at the positive side of the power

supply to the terminal marked “+” and the lead that originates from the
negative side of the power supply to the terminal marked “–”. Avoid
contact with the leads and terminals.

3. Connect the lead that originates from the “A” line from the RS-485

bus to the terminal marked “A” and the lead that originates from the
“B” line to the terminal marked “B.”

4. Plug and seal unused conduit connections on the transmitter housing

to avoid moisture accumulation in the terminal side of the housing. If
you do not seal the unused connections, mount the transmitter with
the electrical housing positioned downward for drainage. Install wiring
with a drip loop. Arrange the drip loop so the bottom is lower than the
conduit connections and the transmitter housing.

5. Attach and tighten all housing covers. Transmitter covers must be

fully engaged to meet Explosion-Proof requirements and to achieve
the proper environmental seal.

2-17

Rosemount 3095FB

Figure 2-13. Field Wiring Connections

RS-485 Bus

+

User-Provided

Power Supply

-

Reference Manual

00809-0100-4738, Rev DA

May 2006

A

B

Inductive-based transient protectors, including the Rosemount 470, can
adversely affect the output of the 3095FB transmitter. Do not use the
Rosemount 470 for transient protection with the 3095FB. If your application
requires transient protection, install the Transient Protection Terminal Block
(Section 5: Troubleshooting).

Signal Wiring Grounding

Do not run signal wiring in conduit or open trays with power wiring, or near
heavy electrical equipment. You may ground the signal wiring at any one point
on the signal loop, or leave it ungrounded. The negative terminal of the power
supply is a recommended grounding point. Device must be properly grounded
or earthed according to local electric codes.

Power Supply

The transmitter requires between 7.5 and 30 V dc to operate and provide
complete functionality. The dc power supply should provide power with less
than 2% ripple.

RS-485 Bus

• The 3095FB does not provide electrical isolation between the RS-485
bus and the transmitter power supply.

• Maintain a bus topology and minimize stub length.

• Figure 2-14 identifies multidrop wiring topology. Up to 32 devices may
be wired on one RS-485 bus.

• The RS-485 bus needs to be terminated once at both ends, and should
not be terminated elsewhere on the bus. Setting the 3095FB AC
termination (AC) switch to ON (see page 2-11) is one method to
provide AC bus termination.

2-18

NOTE

The RTU may already provide one RS-485 bus termination.

Rosemount 3095FB

Figure 2-14. RS-485 Multidrop Topology

Twisted pair required

120 ohm

RS-485 Bus

Reference Manual

00809-0100-4738, Rev DA

May 2006

A

B

120

ohm

RTU

User-Provided

Power Supply

HAZARDOUS
LOCATIONS

A

RS-485

B

+

PWR

-

A

B

+

-

Rosemount

3095FB

Twisted pair not required

A

RS-485

B

+

PWR

-

Rosemount

3095FB

. . .

A

RS-485

B

+

PWR

-

Rosemount

3095FB

The Rosemount 3095FB Transmitter has explosion-proof housing and
circuitry. Individual transmitters are clearly marked with a tag indicating the
certifications they carry. See Appendix B for specific approval categories and
installation drawings.

NOTE

Once a device labeled with multiple approvals is installed, it should not be
reinstalled using any other approval type(s). Permanently mark the
certification label to distinguish the installed approval type from unused
approval types.

Grounding the
Transmitter Case

2-19

The transmitter case should always be grounded in accordance with national
and local electrical codes. The most effective transmitter case grounding
method is direct connection to earth ground with minimal impedance.

Methods for grounding the transmitter case include:

• Internal Ground Connection: The Internal Ground Connection screw
is inside the FIELD TERMINALS side of the electronics housing. This
screw is identified by a ground symbol, and is standard on all
Rosemount 3095FB transmitters.

• External Ground Assembly: This assembly is included with the
transient protection terminal block. The External Ground Assembly can
also be ordered as a spare part (03031-0398-0001).

NOTE

Do not ground the RS-485 bus at any point on the bus.

Rosemount 3095FB

Reference Manual

00809-0100-4738, Rev DA

May 2006

NOTE

The transient protection terminal block does not provide transient protection
unless the transmitter case is properly grounded. Use the above guidelines to
ground the transmitter case. Do not run the transient protection ground wire
with field wiring as the ground wire may carry excessive current if a lighting
strike occurs. Grounding the transmitter case via threaded conduit connection
may not provide sufficient ground.

ROSEMOUNT 305
INTEGRAL MANIFOLD

Integral Manifold
Installation Procedure

The Rosemount 3095FB can be fitted with a 305 Integral Manifold. Supported
manifolds include:

• Traditional Manifold (Rosemount RM style only)

• 3-Valve Coplanar Manifold

• 5-Valve Coplanar Manifold

To install a Rosemount 305 Integral Manifold to a 3095FB transmitter:

1. Inspect the Teflon sensor module O-rings. If the O-rings are

undamaged, reusing them is recommended. If the O-rings are
damaged (if they have nicks or cuts, for example), replace them with
new O-rings.

IMPORTANT

If replacing the O-rings, take care not to scratch or deface the O-ring grooves
or the surface of the isolating diaphragm while you remove the damaged
O-rings.

2. Install the Integral Manifold on the sensor module. Use the four

2.25-in. manifold bolts for alignment. Finger tighten the bolts, then
tighten the bolts incrementally in a cross pattern to final torque value.
See “Mounting Bolts” on page 2-6 for complete bolt installation
information and torque values. When fully tightened, the bolts should
extend through the top of the module housing.

3. If the Teflon O-rings have been replaced, the flange bolts should be

re-tightened after installation to compensate for cold flow of the
O-rings.

2-20

NOTE

Always perform a zero trim on the transmitter/manifold assembly after
installation to eliminate mounting effects.

Reference Manual

00809-0100-4738, Rev DA

Rosemount 3095FB

May 2006

Integral Manifold
Operation

In normal operation the two block valves between the process and instrument ports will be open and the equalizing
valve(s) will be closed.

L

Test

(Plugged)

Isolate
(open)

Process

Drain/
Vent
Valve

Isolate

(open)

H

Equalize

(closed)

Process

THREE-VALVE

L

Isolate
(open)

Drain/
Vent
Valve

Tes t / Vent

Port

(closed) (closed)

Isolate

(open)

HH

Equalize

(closed)

Process

FIVE-VALVE

L

Tes t / Vent

Isolate

(open)

Port

(Plugged)

Tes t

Isolate

(open)

Process

Equalize
(closed)

Test/ Vent (Closed)

Equalize

(closed)

FIVE-VALVE NAT. GAS

To check zero the 3095FB, close the block valve to the low pressure (downstream side) of the transmitter first.

Tes t / Vent

(closed)

Isolate

(closed)

Port

(Plugged)

Isolate

Tes t

(open)

Process

Equalize

(closed)

Test/ Vent (Closed)

FIVE-VALVE NAT. GAS

Drain/
Vent
Valve

Isolate
(open)

H

Equalize

(closed)

Process

THREE-VALVE

L

Drain/
Vent
Valve

Isolate

(closed)

Test/ Vent

Port

(closed)

Isolate

(open)

HH

Equalize

(closed)

Process

L

FIVE-VALVE

Next, open the center (equalize) valve(s) to equalize the pressure on both sides of the transmitter.

Tes t / Vent

(closed)

Isolate

(closed)

Port

(Plugged)

Isolate

Tes t

(open)

Process

Equalize

(open)

Test/ Vent (Closed)

FIVE-VALVE NAT. GAS

Drain/
Vent
Valve

Isolate
(open)

H

Equalize

(open)

Process

THREE-VALVE

L

Drain/
Vent
Valve

Isolate

(closed)

Test/ Vent

Port

(closed)

Isolate

(open)

HH

Equalize

(open)

Process

L

FIVE-VALVE

Equalize

(closed)

Equalize

(open)

L

Tes t

(Plugged)

Isolate

(closed)

Process

L

Tes t

(Plugged)

Isolate

(closed)

Process

2-21

Reference Manual

00809-0100-4738, Rev DA

Rosemount 3095FB

The manifold valves are now in the proper configuration for zeroing the transmitter. To return the transmitter to
service, close the equalizing valve(s) first.

May 2006

Drain/
Vent
Valve

Isolate
(open)

H

Equalize

(closed)

Process

THREE-VALVE

L

Drain/
Vent
Valve

Isolate

(closed)

Test/ Vent

Port

(closed)

HH

Equalize

(closed)

Isolate

(open)

Process

FIVE-VALVE

L

Next, open the block valve on the low pressure side of the transmitter.

Drain/
Vent
Valve

Isolate

(open)

H

Equalize
(closed)

Process

THREE-VALVE

L

Drain/
Vent
Valve

Isolate
(open)

Test/ Vent

Port

(closed)

HH

Equalize

(closed)

Isolate
(open)

Process

FIVE-VALVE

L

(closed)

Isolate

(closed)

(closed)

Isolate
(open)

Tes t/
Vent

(Plugged)

Tes t/
Vent

(Plugged)

Tes t

Isolate

(open)

Process

Tes t

Isolate

(open)

Process

Equalize

(closed)

Test/ Vent (Closed)

Equalize

(closed)

FIVE-VALVE NAT. GAS

Equalize

(closed)

Test/ Vent (Closed)

Equalize

(closed)

Process

FIVE-VALVE NAT. GAS

L

Test

(Plugged)

Isolate

(closed)

Process

L

Test

(Plugged)

Isolate

(open)

2-22

Reference Manual

00809-0100-4837, Rev DA
May 2006

Rosemount 3095FB

Section 3 Modbus Communication

Review the Modbus Protocol Guide for the Rosemount 3095FB Multivariable
Transmitter with Modbus Protocol, Revision F in the next few pages.

Use this document to determine which process variables and status bits you
wish to retrieve from the Rosemount 3095FB.

Suggestions and Tips We recommend that you review the Modbus Protocol Guide in the following

manner:

1. Read Sections 1–3 to gain an overview of how the Rosemount

3095FB implements the Modbus RTU protocol.

2. Read Sections 4–9 as needed to determine which Rosemount

3095FB registers will require read/write actions in order to meet your
process control needs.

NOTE

Be sure to consider Section 3: 8.0 in the Modbus Protocol Guide. The only
way to detect transmitter exceptions is by polling the registers described in
this section.

NOTE

Additional registers may be added to the Modbus Protocol Guide with future
software revisions and upgrades.

NOTE

The following functions are only available for Rosemount 3095FB
Transmitters with software revision 107 or greater:

- Configurable Floating Point Format (Section 3: 3.4)

- Scaled Integers (Section 3: 5.3)

- Duplicate Modbus Register Functionality including 32-bit floating

point registers (Section 3: 2.3.1)

www.rosemount.com

Rosemount 3095FB Multivariable Transmitter

with Modbus Protocol

Modbus Protocol Guide

Report Number: D9500114

Revision: F

Page 1 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

TABLE OF CONTENTS

1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.2 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.3 Abbreviations, Definitions, and Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2.0 Overview of Modbus Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2.1 Physical Communications Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2.2 Transactions on Modbus Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2.2.1 Address Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2.2.2 Function Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2.2.3 Data Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

2.2.4 Error Check Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

2.2.5 Broadcast mode and address 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

2.3 Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

2.3.1 Register Map (available for 3095FB output board Rev. 107 or later) . . . . . .10

2.3.1.1 Accessing Floating Point Registers . . . . . . . . . . . . . . . . . . . . . . . . . .10

2.3.1.2 Accessing Integer Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

2.3.2 Boolean Map (available for 3095FB output board Rev. 107 or later) . . . . . .12

2.3.2.1 Accessing Boolean Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

2.4 Modbus Function Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

2.5 Exception Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

2.6 Examples of Modbus Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.6.1 Reading and Writing Floating Point Data . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.6.2 Reading and Writing 16 Bit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

2.6.3 Reading and Writing Bit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

3.0 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

3.1 Communication Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

3.2 Communication Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

3.3 Write Protect Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

3.4 Floating Point Formats (available for 3095FB output board Rev. 107 or later) . . . .23

4.0 Sensor and Transmitter Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

4.1 Overview of Sensor and Transmitter Information . . . . . . . . . . . . . . . . . . . . . . . . . . .25

4.2 Transmitter Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

4.3 Identify Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

5.0 Process Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

5.1 Process Variables and Process Variable Unit Codes . . . . . . . . . . . . . . . . . . . . . . . . .31

5.2 Process Variable Limit Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

5.3 Integer Scaling of Process Variables (available for 3095FB output board Rev. 107 or lat-

er) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

5.3.1 Defining Scaled Integers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

5.3.1.1 Method 1: Define the Endpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

5.3.1.2 Method 2: Define Scale and Offset . . . . . . . . . . . . . . . . . . . . . . . . . .38

5.3.2 Scaled Integer Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

5.3.2.1 General Exceptions that Apply to All Scaled Outputs . . . . . . . . . . .41

5.3.2.2 Exceptions that Apply to DP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Page 2 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

5.3.2.3 Exceptions that Apply to SP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

5.3.2.4 Exceptions that Apply to PT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

5.4 Untrimmed and Corrected Process Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

5.5 Process Variable Default Values (PT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

6.0 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

6.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

6.1.1 Calibration Flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

6.2 Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

6.3 Restore Factory Trim Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

7.0 LCD Display Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

8.0 Exception Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

8.1 Diagnostic Status Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

8.1.1 Critical Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

8.1.2 Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.0 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

9.1 Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

9.2 Master Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.3 Restoring Nonvolatile Database to Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . .54

Appendix A: Modbus Mapping Assignments by Data Types . . . . . . . . . . . . . . . . . . . . . . . .57

Appendix B: Modbus Mapping Assignments by Register . . . . . . . . . . . . . . . . . . . . . . . . . .67

Appendix C: Modbus Mapping of 32-bit Floating Point Registers . . . . . . . . . . . . . . . . . . .76

Appendix D: Scaled Integer Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Page 3 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

1.0 Introduction

The readers of this document are expected to have a general understanding of the Modbus proto­col. If you do not have the required knowledge of the Modbus protocol, the Modbus documents
referenced in Section 1.2, on page 4 of this document should be of help. Also Section 2.0, on
page 6 of this document contains a brief overview of the Modbus protocol.

1.1 Purpose

The purpose of this document is to provide the information required to implement within a
host, an effective exchange of data with the Rosemount 3095FB Multivariable Transmitter
with Modbus Protocol. This document defines the Modbus interface and register layout in suf­ficient detail for the 3095FB.

1.2 References

Modicon Modbus Protocol Reference Guide

1.3 Abbreviations, Definitions, and Acronyms

Table 1-1 Glossary

Term Description

AP absolute pressure - above absolute zero pressure

C degrees Celsius (5 / 9) * (T(F) - 32)

coil A read/write bit register

Conventional Symbol A symbol which is commonly used in the gas industry in equa-

tions or algorithms or other expressions

CRC Cyclic Redundancy Check

default value The initial value set by software. Some of these may be overwrit-

ten by the user via Modbus commands.

discrete input A read only bit register

DP differential pressure

F degrees Fahrenheit (9 / 5) * T(C) + 32

FP IEEE-754 floating point

floating point register Two consecutive 16 bit registers that store an IEEE 754 floating

point number

Page 4 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 1-1 Glossary

Term Description

FS full scale

GP gage pressure - above atmospheric pressure

holding register A read/write 16 bit register

inH2O inches of water (at defined temperature)

input register A read only 16 bit register

LCD liquid crystal display

psi pounds per square inch

psia pounds per square inch absolute

psig pounds per square inch gauge

PT process temperature

PV(s) process variable(s)

query a request from the master (host) device for a slave device to per-

form an action

register a 16 bit memory location that can be read/write or read only

response a response from a slave device to a master (host) device

SP static pressure

ST sensor temperature

U16 16-bit unsigned integer 0 to 65535

U32 32-bit unsigned integer 0 to 4294967295

U8 8-bit unsigned integer

$ Signifies a hexadecimal number

% Signifies a binary number

Page 5 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

2.0 Overview of Modbus Conventions

The Rosemount 3095FB is a Modbus compatible measurement device. The transmitter supports
8-bit Remote Terminal Unit (RTU) data transmission mode with a subset of read commands,
write commands, and diagnostic commands used by most Modbus compatible host controllers.
The transmitter’s microprocessor emulates Modbus read/write and read only coils and registers.

2.1 Physical Communications Layer

The communications parameters are set at 8 data bits, 1 stop bit, and no parity. These parame­ters are not configurable. The baud rate is selectable using dip switches on the 3095FB output
board. Valid baud rates are 1200, 2400, 4800, and 9600.

2.2 Transactions on Modbus Networks

The Modbus protocol uses a master/slave technique, providing for one master and up to 247
slaves. Only the master can initiate a transaction.

Transactions are either a query/response type where only a single slave is addressed, or a
broadcast/no response type where all slaves are addressed.

The host (master) controller can produce query frames or broadcast frames. Query frames
generate a response frame from one slave device. Broadcast frames address all the slave
devices, which do not respond. A query/response message includes one query frame and one
response frame. A broadcast message includes one broadcast frame. Each frame has an
address field, a function field, a data field, and an error check field.

Table 2-1 Format of Query and Response Frame

Address Field(U8) Function Field(U8) Data Field(Size var-

ies with function)

2.2.1 Address Field

In a query frame, the address field contains a slave’s polling address. In a response frame,
the address field contains the polling address of the responding slave device. In a broadcast
frame, the address field contains a 0.

2.2.2 Function Field

Error Check Field(U16)

In a query frame or a broadcast frame, the function field contains a function code, which
indicates the read, write, or diagnostic command to be performed.

Page 6 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

In a response frame, the function field contains a function code verifying the device’s
response to the command. If the most significant bit in the function field is set, the data field
contains an exception response that explains any errors encountered while processing the
command (see Section 2.5) in the Modbus Protocol Guide.

2.2.3 Data Field

The data field contains information that is specific to each individual function. Section 2.4
gives the data field layout for each function.

2.2.4 Error Check Field

The error check field contains a 16 bit CRC checksum that is used to verify the integrity of
the message frame.

2.2.5 Broadcast mode and address 0

Any query message with a slave address of 0 is a broadcast message. Only Modbus function
codes that write to a register or coil are valid in a broadcast message. Address 0 is reserved
for broadcast messages and therefore is not a valid Modbus slave address.

Page 7 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

2.3 Data Types

The transmitter’s mapped addresses store and use data types supported by many Modbus­compatible PLCs and host controllers. Table 2-2 lists those data types according to their
mapped addresses and corresponding function codes. To increase compatibility with many
different kinds of hosts, the data types have been remapped to several different locations as
shown in Table 2-2. The additional Modbus addresses were implemented in the 3095FB
output board software beginning with Rev.107.

All the registers in this document are referenced to one. The registers in Modbus messages are
referenced to zero. This means the number of the mapped address register (i.e. 0005) is one
higher than the actual number (i.e. 0004) that is sent in the Modbus frame message.

There are a number of 8 bit values that are stored in 16 bit registers. The 8 bit value is stored in
the Least Significant Byte of the 16 bit register. For example the value $24 would be stored as
$0024. This does not apply to ASCII characters which are stored as two characters in each 16
bit register.

Floating point values are stored as single precision IEEE 754 floating point numbers. Since
IEEE 754 floating point numbers are 32 bits long, they must be stored as either two 16-bit reg­isters or as one 32-bit register. The 3095FB supports both types of floating point registers. See
Section 2.3.1 for a more detailed explanation of the register mapping.

Page 8 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 2-2 Data Types According to Function Code and Mapped Address

Address

start

register

1 *

1001
10001

401 *

7401
20401

1 *

3001
30001
40001
50001

Address

end

register

86 *

1086
10086

488 *

7444
20488

214 *

3214
30214
40214
50214

Register

size in

bits

1
1
1

16
32
16

16
16
16
16
16

Accessible

via

function

codes

01, 02, 05 Coil Read/

01, 02 Discrete

03, 04,
06**, 16,
69, 70

03, 04 Input reg-

Address

type

input

Floating
point reg­ister

isters

Access Description

write

Read­only

Read­only and
read/
write

Read­only

Single ON/OFF bit per coil
(Boolean). Shares the same
register range with the Dis­crete Inputs. See Section

2.3.2.

Single ON/OFF bit per coil
(Boolean). Shares the same
register range with the Dis­crete Inputs. See Section

2.3.2.

IEEE 754 floating point
number. Accessed as either
two 16-bit registers or one
32-bit register. See Section

2.3.1.

One 16 bit unsigned integer
per register. Shares the
same register range with
the Holding registers and
ASCII registers. See Sec-

tion 2.3.1.

03, 04, 06, 16Holding

register

03, 04, 06,
16

* Base Address. The other register ranges are duplicate addresses for the base registers. Reading and
writing to these duplicates is the same as reading and writing to the base registers.
** Floating Point numbers can only be written with function code 6 if the register is a 32-bit register.

ASCII
characters

Page 9 of 79

Read/
write

Read/
write

One 16 bit unsigned integer
per register. Shares the
same register range with
the Input registers and
ASCII registers. See Sec-

tion 2.3.1.

Two ASCII characters per
16 bit register. Shares the
same register range with
the Input registers and
Holding registers. See Sec-

tion 2.3.1.

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

2.3.1 Register Map (available for 3095FB output board Rev. 107 or later)

There are two base register blocks used in the register map. These register blocks contain the
integer data and the floating point data. To improve connectivity with many different kinds
of hosts, these base register blocks appear in other address ranges, as shown in Figure 2-1 .

2.3.1.1 Accessing Floating Point Registers

The host can access each floating point register in 3 different locations. To access the 16­bit floating point register pairs in the regions other than the base region, simply add the
base register address (i.e. 401) to the desired range (i.e. 20,000), which gives the new reg­ister address (i.e. 20,401). The 32-bit floating point numbers do not match up one to one
with the base floating point register pairs, because the 32-bit floating point registers take
half the register space of the 16-bit floating point register pairs. To access the 32-bit float­ing point registers (7401-7444) use [Equation 1] or see for the complete layout of the 32­bit register block.

[Equation 1] 32-bit register address = 7401 + (base address - 401) / 2

Examples:

Differential Pressure = 7401 + (401 - 401) / 2 = 7401

Static Pressure = 7401 + (403 - 401) / 2 = 7402

Differential Pressure Damping = 7401 + (441 - 401) / 2 = 7421

For example, the host can read the floating point value for Differential Pressure(DP) from
3 separate register locations. The DP can be read as 16-bit register pairs by reading regis­ters 401-402 or 20401-20402. The DP can also be read as one 32-bit register at location

7401.

2.3.1.2 Accessing Integer Registers

The integer registers consist of the input registers, holding registers, and ASCII registers.
The host can access each integer register in 5 different locations. To access the 16-bit reg­isters in the regions other than the base region, simply add the base register address (i.e.

61) to the desired range (i.e. 3,000), which gives the new register address (i.e. 3,061).

For example, the host can read the Static Pressure (SP) Unit Code from 5 separate loca­tions. The transmitter address can be read from registers 61, 3061, 30061, 40061, or

50061.

Page 10 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Figure 2-1 Register Map

1-214

401-488

3001-3214

7401-7444

30001-30214

40001-40214

50001-50214

Base 16-bit Integers

Base 16-bit Floats

Integers 16-bit

Floats 32-bit

Floats 16-bit20401-20488

Integers 16-bit

Integers 16-bit

Integers 16-bit

32-bit Float
Address

7401

7402

7403

16-bit Float
Address

20401

20402

20403

16-bit Float
Base Address

401

402

403

404

405

406

16-bit Float
Base Address

401

402

403

20404

20405

20406

404

405

406

Page 11 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

2.3.2 Boolean Map (available for 3095FB output board Rev. 107 or later)

There is one base boolean register block used to store boolean data. To improve connectivity
with many different kinds of host, this boolean register block has been duplicated in other
address ranges, as shown in Figure 2-2 .

2.3.2.1 Accessing Boolean Data

The boolean registers can be accessed in 3 different locations. To access the boolean regis­ters in the regions other than the base region, simply add the base register address (i.e. 1)
to the desired range (i.e. 1,000), which gives the new register address (i.e. 1,001).

For example, the host can perform a self test by writing to any of 3 separate coil locations.
A self test can be performed by writing to either coil 1, 1001, or 10001. Whichever coil
location is most convenient for the host can be used.

Figure 2-2 Boolean Map

1-86

1001-1086

Base Coils

Coils

Coils10001-10086

Coil

Address

1001

1002

1003
1004

1005

1006

Coil

Address

10001

10002

10003
10004

10005

Coil

Base Address

1

2

3

4

5

6

Coil

Base Address

1

2

3

4

5

Page 12 of 79

10006

6

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

2.4 Modbus Function Codes

The transmitter supported function codes listed below include read, write, and diagnostic
commands. See Section 2.6 for examples on reading and writing data with Modbus function
codes.

Table 2-3 Explanation of Function Codes Supported by the Rosemount 3095FB

Function

code

Command

type

Description Explanation of function code

01 Read Read coil status Read ON/OFF status of one coil or con-

secutive coils.

02 Read Read input status Read ON/OFF status of one discrete input

or consecutive discrete inputs.

03 Read Read holding regis-

ters

Read binary values of one or more holding
registers.

04 Read Read input registers Read binary values in one or more input

registers.

05 Write Force coil Set coil to a specified ON or OFF state.

06 Write Load register Write a binary value to a holding register.

08 Diagnostic Loopback diagnos-

tic

Sends diagnostic test message to transmit­ter to evaluate communications process­ing.

16 Write Load multiple reg-

isters

Writes values to consecutive holding reg­isters.

69 Read Read multiple

floating point regis­ters

70 Write Load multiple

floating point regis­ters

Page 13 of 79

Read binary values of one or more 32 bit
floating point registers. This function is
specific to the 3095FB.

Write values to consecutive 32 bit floating
point registers. This function is specific to
the 3095FB.

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 2-4 Format of Modbus Functions

START ADDRESS FUNCTION DATA CRC CHECK END

3.5 char times 1 CHAR 1 CHAR n CHARs L CHAR, H CHAR 3.5 char times

query $01 start bit H start bit L bit cnt H bit cnt L

resp $01 byte cnt bit7...bit0 bit15...bit8 ...

resp $81 error code

query $02 start bit H start bit L bit cnt H bit cnt L

resp $02 byte cnt bit7...bit0 bit15...bit8 ...

resp $82 error code

query $03 start reg H start reg L reg cnt H reg cnt L

resp $03 byte cnt data H data L ...

resp $83 error code

query $04 start reg H start reg L reg cnt H reg cnt L

resp $04 byte cnt data H data L ...

resp $84 error code

query $05 bit addr H bit addr L FF/00 00

resp $05 bit addr H bit addr L FF/00 00

resp $85 error code

query $06 reg addr H reg addr L data H data L

resp $06 reg addr H reg addr L data H data L

resp $86 error code

query $08 00 00 data H data L

resp $08 00 00 data H data L

resp $88 error code

query $10 start reg H start reg L reg cnt H reg cnt L byte cnt data H data L ...

resp $10 start reg H start reg L reg cnt H reg cnt L

resp $90 error code

Page 14 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

query $45 start reg H start reg L reg pair

cnt H

resp $45 byte cnt data H data L ...

resp $C5 error code

query $46 start reg H start reg L reg cnt H reg cnt L byte cnt data H data L ...

resp $46 start reg H start reg L reg pair

cnt H

resp $C6 error code

reg pair

cnt L

reg pair

cnt L

2.5 Exception Responses

If the transmitter cannot execute a command issued by a query, the most significant bit in the
response function field is set, and the data field contains an exception response, which
explains why the transmitter cannot execute the command.

If the transmitter receives a query that will take over 250 ms it will respond with the normal
reply even though the command has not completed. Any subsequent query from the host will
result in a Slave Busy (06) response until the first command finishes processing.

...

Table 2-5 Exception Responses

Exception

Response

Description Explanation of Exception Response

01 Illegal function The received message function is not an allowable

action for the transmitter

02 Illegal data address The address referenced in the data field is not an

allowable address for the memory location

03 Illegal data value The value referenced in the data field is not

allowed in the addressed memory location

04 Slave Device Failure An unrecoverable error occurred while the slave

was attempting to perform the requested action.

06 Slave device is busy The slave is engaged in processing a long duration

command. The host should retransmit the mes­sage later when the slave is free.

Page 15 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

2.6 Examples of Modbus Commands

2.6.1 Reading and Writing Floating Point Data

Floating point values must be read or written in a single command to a series of two
consecutive registers. If half of a floating point register is written the 3095FB will return

the Modbus exception Illegal Data Value(03). There are two ways to read a floating point
register pair, using function 03/04 or function 69. When using function 03/04 the user must
always read at least 2 registers to get a valid floating point number, unless they are reading a
32-bit floating point register. Function 69 reads a register pair (two consecutive 16 bit regis­ters). Function 03 and function 04 are interchangeable when working with the 3095FB.
There are two ways to write a 16-bit register pair, using function 16 and function 70. When
writing to a 32-bit register either function 6 or function 16 can be used.

The first three examples show the Modbus message for reading a Differential Pressure (DP)
of 100.00. The last four examples show the Modbus message for writing a DP upper operat­ing limit of 230.00.

See Section 3.4 for information on changing the byte transmission order of the floating point
registers.

Function 04: Reading Floating Point Data from a 16-bit Register Pair

Address Function Starting reg-

# of registers Error check

ister

Query 01 04 01 90 00 02 XXXX

Address Function Byte count Register data

Error check

bytes

Response 01 04 04 42 C8 00 00 XXXX

Function 04: Reading Floating Point Data from a 32-bit Register

Address Function Starting reg-

# of registers Error check

ister

Query 01 04 1C E8 00 01 XXXX

Address Function Byte count Register data

Error check

bytes

Response 01 04 04 42 C8 00 00 XXXX

Page 16 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Function 69: Reading Floating Point Data using a 32-bit Function

Address Function Starting reg-

ister

# of register
pairs

Error check

Query 01 45 01 90 00 01 XXXX

Address Function Byte count Register data

Error check

bytes

Response 01 45 04 42 C8 00 00 XXXX

Function 16: Writing Floating Point Data in a 16-bit Register Pair

Address Function Starting

register

# of reg­isters

byte
count

Register
data bytes

Error
check

Query 01 10 01 A0 00 02 04 43 66 00 00 XXXX

Address Function Starting

register

# of reg­isters

Error
check

Response 01 10 01 A0 00 02 XXXX

Function 06: Writing Floating Point Data in a single 32-bit Register

Address Function Starting

register

Register data
bytes

Query 01 06 1C F0 43 66 00 00 XXXX

Address Function Starting

register

Register data
bytes

Response 01 06 1C F0 43 66 00 00 XXXX

Error
check

Error
check

Page 17 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Function 16: Writing Floating Point Data in a 32-bit Register

Address Function Starting

register

# of reg­isters

byte
count

Register
data bytes

Error
check

Query 01 10 1C F0 00 01 04 43 66 00 00 XXXX

Address Function Starting

register

# of reg­isters

Error
check

Response 01 10 1C F0 00 01 XXXX

Function 70: Writing Floating Point Data using a 32-bit Function

Address Function Starting

register

# of reg­ister

byte
count

Register
data bytes

Error
check

pairs

Query 01 46 01 A0 00 01 04 43 66 00 00 XXXX

Address Function Starting

register

# of reg­isters

Error
check

pairs

Response 01 46 01 A0 00 01 XXXX

Page 18 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

2.6.2 Reading and Writing 16 Bit Registers

Function 04: Reading 16 Bit Register Data

Modbus Protocol Guide

Address Function Starting reg-

# of registers Error check

ister

Query 01 04 00 12 00 01 XXXX

Address Function Byte count Register data

Error check

bytes

Response 01 04 02 00 86 XXXX

Function 16: Writing 16 Bit Register Data

Address Function Starting

register

# of reg­isters

byte
count

Register
data bytes

Query 01 10 00 30 00 01 02 00 24 XXXX

Address Function Starting

register

# of reg­isters

Error
check

Response 01 10 00 30 00 01 XXXX

Error
check

2.6.3 Reading and Writing Bit Registers

If the returned input quantity is not a multiple of eight bits, the remaining bits in the final
data byte will be padded with zeros (toward the high end of the byte). In this case all four of
the bits that were asked for were ON (0000 1111). The rest of the byte was padded with
zeros.

Function 02: Reading Bit Registers

Address Function Starting reg-

# of registers Error check

ister

Query 01 02 00 3A 00 04 XXXX

Address Function Byte count Register data

Error check

bytes

Response0102010F XXXX

Page 19 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

When forcing a coil there are only two valid values that can be sent to the coil. The value
$FF00 will force the coil to 1(ON) and $0000 will force the coil to 0(OFF).

Function 05: Forcing a Single Coil

Address Function Coil address Force data Error check

Query 01 05 00 02 FF 00 XXXX

Address Function Coil address Force data Error check

Response 01 05 00 02 FF 00 XXXX

Page 20 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

3.0 Communications

3.1 Communication Options

The Transmitter Polling Address is used to identify the Modbus slave device to the host
device. No two transmitters on the same multidrop loop can have the same Transmitter Polling
Address.

The Turnaround Delay Time is the time in milliseconds that the 3095FB will wait to respond
after receiving a query from the host. If the Turnaround Delay Time is set to zero the 3095FB
will respond as fast as it can. With a simple polling of the PVs and Status Registers the
3095FB will respond after about 6 milliseconds. This may be too fast for some hosts. The
default Turnaround Delay Time is 50 milliseconds.

Table 3-1 Communication Options

Modbus Access

Address

0016 Holding

0131 Holding

Address

Type

register

register

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3

DESCRIPTION

Attributes

R/W, WP Communi-

R/W, WP Turnaround Delay Time (ms)

Functional

Area

Transmitter Polling Address
cations
Options

in the Modbus Protocol Guide)

range: 1 - 247

range: 0 - 200 ms

Data / Control Default

1

50 ms

Page 21 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

3.2 Communication Statistics

The following registers provide some communication statistics that may be used to gather
diagnostic information. The communications statistics will be reset when the 3095FB loses
power or if a Master Reset is performed. The registers will be reset to zero when the value of
the registers exceed the maximum value for an unsigned 16 bit number.

Table 3-2 Communication Statistics

Modbus Access

Address

Address

Type

0145 Input reg-

ister

0146 Input reg-

Attributes

Functional

Area

RO Communi-

cation Sta-

RO Noise Error Count

tistics

DESCRIPTION

Data / Control

Framing Error Count

ister

0147 Input reg-

RO Overrun Error Count

ister

0148 Input reg-

RO CRC Error Count

ister

0149 Input reg-

RO Busy Count

ister

0150 Input reg-

RO Good Message Count

ister

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3

located in the Modbus Protocol Guide)

3.3 Write Protect Jumper

Once the transmitter has been configured, the configuration data can be protected by moving
the write protection (WP) to the ON position. This jumper is located on the Output Electronics
Board.

If the WP jumper is ON and the host tries to write to a register location that has the attribute
Write Protected (WP), the Modbus exception Illegal Data Address (02) will be returned.

Page 22 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

3.4 Floating Point Formats (available for 3095FB output board software Rev. 107 or later)

The 3095FB has the capability to rearrange the transmission byte order of the floating point
registers. The floating point registers will still be in IEEE 754 format, only the transmission
byte order will change. Writing the Floating Point Format Code affects both the reading and
writing of the floating point registers. All the floating point registers in the transmitter are
affected by this register. The available Floating Point Formats are shown in Table 3-5. Chang­ing the Floating Point Format Code will not affect the transmission byte order of the integer
data.

Table 3-3 Floating Point Format Code

Modbus Access

Address

Address

Type

0132 Holding

register

Attributes

Functional

Area

RW, WP Communi-

cation

DESCRIPTION

Data / Control

Floating Point Format Code

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3

located in the Modbus Protocol Guide)

Table 3-4 Floating Point Format

Byte Order

Notation A B C D

IEEE 754 Float-

SEEE EEEE EMMM MMMM MMMM MMMM MMMM MMMM

ing Point Format

Example Number

$42 $C8 $80 $00

(100.25)

Legend: S = sign bit; E= exponent bits; M = mantissa bits

Table 3-5 Available Floating Point Formats

Floating Point Format Code Byte Transmission Order Example Number (100.25)

0 (default) A B C D $42 C8 80 00

1 C D A B $80 00 42 C8

2 D C B A $00 80 C8 42

3 B A D C $C8 42 00 80

Page 23 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Below is an example of a Modbus message for reading DP (register 401) of 100.25 for each of
the Floating Point Format Codes.

Table 3-6 Floating Point Format Code = 0

Address Function Starting reg-

# of registers Error check

ister

Query 01 04 01 90 00 02 XXXX

Address Function Byte count Register data

Error check

bytes

Response 01 04 04 42 C8 80 00 XXXX

Table 3-7 Floating Point Format Code = 1

Address Function Starting reg-

# of registers Error check

ister

Query 01 04 01 90 00 02 XXXX

Address Function Byte count Register data

Error check

bytes

Response 01 04 04 80 00 42 C8 XXXX

Table 3-8 Floating Point Format Code = 2

Address Function Starting reg-

# of registers Error check

ister

Query 01 04 01 90 00 02 XXXX

Address Function Byte count Register data

Error check

bytes

Response 01 04 04 00 80 C8 42 XXXX

Table 3-9 Floating Point Format Code = 3

Address Function Starting reg-

# of registers Error check

ister

Query 01 04 01 90 00 02 XXXX

Address Function Byte count Register data

Error check

bytes

Response 01 04 04 C8 42 00 80 XXXX

Page 24 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

4.0 Sensor and Transmitter Information

4.1 Overview of Sensor and Transmitter Information

The sensor and transmitter information consists of integer data and ASCII character strings
that provide data about the transmitter. The user can review or change sensor and transmitter
information without affecting the operation of the transmitter. The transmitter information that
are 8 bit values are stored in the Least Significant Byte of their 16 bit register space. For
instance the value $24 would be stored as $0024.

Page 25 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

4.2 Transmitter Info

Modbus Protocol Guide

Table 4-1 Transmitter Info

Modbus Access

Address

Address

Type

0017 Input Reg-

ister

0018 Input Reg-

ister

0019 Input Reg-

ister

0020 Input Reg-

ister

DESCRIPTION

Attributes

RO Materials

Functional

Area

Data / Control

DP Sensor Range Code (U8)
of Con­struction

2

3

-250 to 250 in H2O @ 60 F

-830 to 830 in H2O @ 60 F

RO SP Sensor Range Code (U8)

3

4

0 to 800 psi
0 to 3,626 psi

RO PT Sensor Range Code (U8)

2 -40 to 1200 F

RO Module Isolator Code (U8)

2

3

4

5

15

253

316 Stainless Steel
Hastelloy C
Monel
Tantalum
Gold/Monel
Special

0021 Input Reg-

ister

0022 Holding

register

RO Module Fill Fluid Code (U8)

1

2

250

253

Silicone
Inert
Not Used
Special

R/W, WP flange material code (U8)

0

2

3

4

24

252

253

Page 26 of 79

Carbon Steel
316 Stainless Steel
Hastelloy C

TM

Monel
Kynar
Unknown
Special

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 4-1 Transmitter Info

Modbus Access

Address

Address

Type

0023 Holding

register

Attributes

Functional

Area

R/W, WP Materials

of Con­struction

DESCRIPTION

Data / Control

flange type code (U8)

12

13

14

15

16

17

18

19

20

21

22

23

24

25

250

252

253

Conventional
Coplanar
Remote Seal
Lvl, 3 in, class 150 (ANSI)
Lvl, 4 in, class 150 (ANSI)
Lvl, 3 in, class 300 (ANSI)
Lvl, 4 in, class 300 (ANSI)
Lvl, DN 80, PN 40
Lvl, DN 100, PN 40
Lvl, DN 100, PN 10 / 16
Lvl, 2 in, class 150 (ANSI)
Lvl, 2 in, class 300 (ANSI)
Lvl, DN 50, PN 6
Lvl, DN 50, PN 40
Not Used
Unknown
Special

0024 Holding

register

0025 Holding

register

R/W, WP drain/vent code (U8)

2

3

4

251

252

253

316 Stainless Steel
Hastelloy C

TM

Monel
None
Unknown
Special

R/W, WP O-ring gasket material (U8)

10

11

12

13

250

252

253

PTFE (Teflon R)
Viton
Buna-N
Ethyl-Prop
Not Used
Unknown
Special

Page 27 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 4-1 Transmitter Info

Modbus Access

Address

Address

Type

0026 Holding

register

Attributes

Functional

Area

R/W, WP Materials

of Con­struction

DESCRIPTION

Data / Control

remote seal type (U8)

2

3

4

5

6

7

8

9

10

11

12

250

251

252

253

CTW
EFW
PFW
RFW
RTW
SCW
SSW
High Temperature
FFW
UCW
TSW
Not Used
None
Unknown
Special

0027 Holding

register

0028 Holding

register

R/W, WP remote seal fill fluid (U8)

2

3

4

5

6

7

251

252

253

Silicone Oil
Syltherm 800
Inert
Glycerin / H20
Prop Gly / H20
Neobee-M20
None
Unknown
Special

R/W, WP remote seal isolator material (U8)

2

3

5

9

250

251

252

253

316 Stainless Steel
Hastelloy C
Tantalum
Cobalt-Chromium-Nickel
Not Used
None
Unknown
Special

Page 28 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 4-1 Transmitter Info

Modbus Access

Address

Address

Type

0029 Holding

register

0030,
0031

0032-

Holding
register

ASCII R/W, WP user-entered tag (U8x8)

0035

0036-

ASCII R/W, WP user-entered descriptor(U8x16)

0043

Attributes

Functional

Area

R/W, WP Materials

of Con­struction

R/W, WP transmitter

info

DESCRIPTION

Data / Control

number of remote seals (U8)

1

2

250

251

252

One Seal
Two Se al
Not Used
None
Unknown

user-entered date (U24)

day/month/year

i.e. April 26, 1996 = 0x001a, 0x0460

0044­0059

ASCII R/W, WP user entered message (U8x32)

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3

located in the Modbus Protocol Guide)

Page 29 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

4.3 Identify Transmitter

Modbus Protocol Guide

Table 4-2 Identify Transmitter

Modbus Access

Address

Address

Type

0001 Input reg-

ister

0002 Input reg-

ister

0003 Input reg-

ister

0004 Input reg-

ister

0005,
0006

Input reg­ister

DESCRIPTION

Attributes

RO identify

Functional

Area

transmitter

Data / Control

Manufacturer’s Code (U8)
38 Rosemount

RO Transmitter Type Code (U8)

31 3095FB Multivariable Trans­mitter with Modbus Protocol

RO Output Board Software Rev Level

(U8 + U8)
MSB = integer part
LSB = decimal part
i.e. 0x6803 = rev. 104.3

RO Sensor Module Software Rev

Level (U8)

RO Sensor Module Serial Number

(U24)

0007,
0008

0009 Input reg-

Input reg­ister

RO Transmitter Serial Number (U24)

RO Hardware Rev Level (U8)

ister

0010 Input reg-

RO Modbus Specific Rev Level (U8)

ister

0011 Input reg-

ister

RO Sensor Type (U8)

%xxxx xxx1 absolute SP
%xxxx xxx0 gage SP

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3

located in the Modbus Protocol Guide)

Page 30 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

5.0 Process Variables

5.1 Process Variables and Process Variable Unit Codes

Floating point values of process variables, and integer unit codes for the corresponding mea­surement units can be read from the registers shown below. The unit codes are 8 bit integers
that are stored in the Least Significant Byte of their 16 bit register. For instance if the value

$0001 is stored in register 40060 it would represent the unit code 1 (Inches of H2O@ 60o F).

Table 5-1 Process Variables

Modbus Access

Address

0401,
0402

0403,
0404

0405,
0406

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3

Address

Type

FP register RO PVs DP

FP register RO SP

FP register RO PT

Attributes

located in the Modbus Protocol Guide)

Table 5-2 Unit Codes

Functional

Area

DESCRIPTION

Data / Control

Modbus Access

Address Attributes Variable Integer Codes Default

0060 R/W, WP Differen-

tial Pres­sure

0061 R/W, WP Static Pres-

sure

DESCRIPTION

1
2
3
6

3
4
5

Page 31 of 79

inches of water at 60 F
pascals
kilopascals
inches of water at 68 F

kilopascals
Mega Pascals
Pounds per Square Inch

1

5

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-2 Unit Codes

Modbus Access

DESCRIPTION

Address Attributes Variable Integer Codes Default

0062 R/W, WP Process

Tempera -

20
21

Degrees Celsius
Degrees Fahrenheit

21

ture

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in the

Modbus Protocol Guide)

5.2 Process Variable Limit Checking

There are essentially four different limits for each process variable. These are the Upper
Range Limit(URL), Lower Range Limit(LRL), Upper Operating Limit(UOL), and the Lower
Operating Limit(LOL). The host can only change the Upper and Lower Operating Limits. The
Upper Range Limit and the Lower Range Limit are fixed and depend on the range of the sen­sor module.

The UOL and LOL cannot cross each other. Here is the formula that the transmitter uses to
validate the operating limits sent by the host. The 3095FB will return the Modbus exception
Illegal Data Value(03) if invalid operating limits are sent.

Lower Operating Limit:

LRL <= LOL <= (UOL - min_span)

Upper Operating Limit:

(LOL + min_span) <= UOL <= URL

min_span = URL/100

Page 32 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-3 Process Variable Sensor Limits

Address

0413,
0414

0415,
0416

0417,
0418

0419,
0420

0421,
0422

0423,
0424

0425,
0426

Modbus Access

Address

Type

Attributes

Functional

Area

FP register RO Sensor lim-

DESCRIPTION

Data / Control

DP upper range limit

its

FP register RO DP lower range limit

FP register R/W, WP DP upper operating limit

FP register R/W, WP DP lower operating limit

FP register RO SP upper range limit

FP register RO SP lower range limit

FP register R/W, WP SP upper operating limit

0427,

FP register R/W, WP SP lower operating limit

0428

0429,

FP register RO PT upper range limit

0430

0431,

FP register RO PT lower range limit

0432

0433,

FP register R/W, WP PT upper operating limit

0434

0435,

FP register R/W, WP PT lower operating limit

0436

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3located in

the Modbus Protocol Guide)

Page 33 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

5.3 Integer Scaling of Process Variables (available for 3095FB output board software
Rev. 107 or later)

Integer scaling allows the 3095FB to represent the process variables (DP, PT, and SP) as 16 bit
integers.

Figure 5-1 Scaled Integers

65534

output

Scaled
Output

(x1, y1)

input

0

LRL URL

Process Variable Floating Point Input

Where: x1 = Minimum Measured Process Variable

x2 = Maximum Measured Process Variable
y1 = Minimum Scaled Integer Value
y2 = Maximum Scaled Integer Value

(x2, y2)

Page 34 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-4 Process Variable Scaled Integers

Modbus Access

Address

Address

Type

0116 Input reg-

ister

0117 Input reg-

Attributes

Functional

Area

RO PV Scaled

Integers

RO SP

DESCRIPTION

Data / Control

DP

ister

0118 Input reg-

RO PT

ister

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3located in

the Modbus Protocol Guide)

5.3.1 Defining Scaled Integers

There are two separate ways to configure the Scaled Integers. The next two sections describe
the two methods. A holding register is provided to allow the user to choose which of the fol­lowing methods is used to configure the Scaled Integers. Only the registers needed for that
method will be enabled. The Modbus error ILLEGAL DATA VALUE will be returned if an
attempt is made to write to a disabled register. See for implementation examples.

If the Scaled Integers are disabled, all the Scaled Integers will be set to 65535.

Table 5-5 Scaled Integer Method

Modbus Access

Address

Address

Type

0204 Holding

Register

Attributes

Functional

Area

R/W, WP Scaled Integer Method

DESCRIPTION

Data / Control

0 = Disable Scaled Integers
(default)
1= Method 1
2= Method 2

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3)

Page 35 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

5.3.1.1 Method 1: Define the Endpoints

The host can configure the scaled integers just by defining the endpoints (x1,y1 and x2,y2)
for the line shown Figure 5-1 .

The 3095FB will reject endpoints that do not conform to the following limits.

Table 5-6 Limits for Defining Endpoints

Variable Valid Range Type Description

x

1

x

2

y

1

y

2

LRL < x1 < (x2 - min_span) F32 Minimum Measured Value

(x1 + min_span) < x2 < URL F32 Maximum Measured Value

0 < y1 < y

2

U16 Minimum Scaled Integer

y1 < y2 < 65534 U16 Maximum Scaled Integer

The values for x1 and x2 should be configured for the current unit codes. If the host
changes unit codes after the scaled integers are configured using Method 1, the values for

x1 and x2 will be changed to reflect the new unit codes.

Page 36 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-7 PV Scaled Integer Y Value

Modbus Access

Address

Address

Type

0188 Holding

register

0189 Holding

Attributes

Functional

Area

RW PV Scaled

Integers

RW DP_y2

DESCRIPTION

Data / Control

DP_y1

register

0190 Holding

RW SP_y1

register

0191 Holding

RW SP_y2

register

0192 Holding

RW PT_y1

register

0193 Holding

RW PT_y2

register

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Page 37 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-8 PV Scaled Integer X Value

Address

0469,
0470

0471,

Modbus Access

Address

Type

Attributes

Functional

Area

FP register RW PV Scaled

Integers

FP register RW DP_x2

DESCRIPTION

Data / Control

DP_x1

0472

0473,

FP register RW SP_x1

0474

0475,

FP register RW SP_x2

0476

0477,

FP register RW PT_x1

0478

0479,

FP register RW PT_x2

0480

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3)

5.3.1.2 Method 2: Define Scale and Offset

To configure the integer scaling of PVs using Method 2, follow this procedure:

1. Set a maximum integer.

2. Calculate the scale factor for each PV.

3. Calculate the offset for each PV

4. Write the values calculated above to the corresponding registers.

The following formula is used to calculate the scale factor and offset:

[Equation 2] y = A(x) - (B - 32,768)

Where: y = scaled integer output (see Table 5-4)

x = measured value of PV in current units (see Table 5-1)
A = scale factor (see Table 5-10)
B = offset of scaled integer (see Table 5-10)

Page 38 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-9 PV Scaled Integer Maximum Integer

Modbus Access

Address

Address

Type

125 Holding

register

Attributes

Functional

Area

RW PV Scaled

Integers

DESCRIPTION

Data / Control

Maximum Integer (applies to all
PVs)

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Maximum Integer: The maximum integer is the upper limit for the scaled integer output.
If the measured value derives an integer higher than the maximum integer or lower than 0,
the maximum integer plus one will be returned. Also, if any of the error conditions
described in Section 5.3.2 occur the affected scaled integers will be set to the maximum
integer plus one. The maximum integer can be any value from 0 to 65534. The default
maximum integer is 65534.

Page 39 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-10 Scale Factors and Offsets

Modbus Access

Address

Address

Type

0198 Holding

register

0199 Holding

Attributes

Functional

Area

RW PV Scaled

Integers

RW DP Offset

DESCRIPTION

Data / Control

DP Scale Factor

register

0200 Holding

RW SP Scale Factor

register

0201 Holding

RW SP Offset

register

0202 Holding

RW PT Scale Factor

register

0203 Holding

RW PT Offset

register

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3)

Scale Factor: The scale factor is the linear slope of the line represented in Figure 5-1 .
The scale factor is the ratio of the change of the scaled integers compared to the change of
the measured process variable.

The Scale Factor and Offset must be configured for the current unit codes. If the unit
codes are changed the Scale Factor and Offset must be recalculated.

[Equation 3] A = (y2 - y1)/(x2 - x1)

Offset: The offset is calculated using [Equation 4].

[Equation 4] B = A(x1) + 32768 - y

Page 40 of 79

1

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

5.3.2 Scaled Integer Error Conditions

If an error occurs the scaled output will be set to either y2 + 1 (Method 1) or maximum inte­ger + 1 (Method 2).

5.3.2.1 General Exceptions that Apply to All Scaled Outputs

Table 5-11 General Sensor Errors

Attributes Description

AD ST signal is above Upper Internal Limit

AD ST signal is below Lower Internal Limit

AD Sensor module is NOT updating

AD Sensor microprocessor does not respond

If the calculated scaled output is greater than y2 (Method 1) or less than y1 (Method 1) the
value returned is y2 + 1.

If the calculated scaled output is greater than the maximum integer (Method 2) or less than
zero (Method 2) the value returned is maximum integer + 1.

5.3.2.2 Exceptions that Apply to DP

The following exceptions apply only to the differential pressure.

Table 5-12 DP Exceptions

Attributes Description

AD DP signal above Upper Range Limit + 10%

W DP signal above Upper Range Limit

W DP signal below Lower Range Limit

AD DP signal below Lower Range Limit - 10%

AD SP signal above Upper Range Limit + 10%

AD SP signal below Lower Range Limit - 10%

AD SP sensor shorted

AD SP signal is unreasonable - open bridge

Page 41 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

5.3.2.3 Exceptions that Apply to SP

The following exceptions apply only to the static pressure.

Table 5-13 SP Exceptions

Attributes Description

AD SP signal above Upper Range Limit + 10%

W SP signal above Upper Range Limit

W SP signal below Lower Range Limit

AD SP signal below Lower Range Limit - 10%

AD SP sensor shorted

AD SP signal is unreasonable - open bridge

Modbus Protocol Guide

5.3.2.4 Exceptions that Apply to PT

The following exceptions apply only to the process temperature.

Table 5-14 PT Exceptions

Attributes Description

AD PT signal above Upper Range Limit + 10%

W PT signal above Upper Range Limit

W PT signal below Lower Range Limit

AD PT signal below Lower Range Limit - 10%

5.4 Untrimmed and Corrected Process Variables

A 24 bit integer will be provided that shows an integer representation of the process variables
before they have been trimmed and damped.

The formula for interpreting the 24 bit numbers is shown below.

output = (input - 8388608) * URL

7601920

Where:

input = Untrimmed and Corrected Process Variable
output = Scaled Process Variable

Page 42 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-15 Untrimmed and Corrected Process Variables

Address

0076,
0077

Modbus Access

Address

Type

Input reg­ister

Attributes

Functional

RO PVs

Untrimmed

Area

DESCRIPTION

Data / Control

DP (3 bytes)

and Cor-

0078,
0079

0080,
0081

Input reg­ister

Input reg­ister

RO SP (3 bytes)

rected

RO PT (3 bytes)

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

5.5 Process Variable Default Values (PT)

The 3095FB allows for the enabling and disabling of the PT input. To disable the PT input
turn the RTD present coil OFF. Likewise to enable the PT input turn the RTD present coil ON.
If the RTD present coil is OFF the User Entered PT Value is used.

When entering a User Entered PT Value the current PT unit code is used. If the current PT unit
code is oF then entering a floating point value of 60 in the register pair 455, 456 would set the
User Entered PT Value to 60 oF. If at a later time the PT unit code is changed to oC then the
User Entered PT Value will read as 15.556 oC.

Page 43 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 5-16 RTD Present

Address

Modbus Access

Address

Type

Attributes

Functional

Area

DESCRIPTION

Data / Control

0004 Coil R/W, WP RTD present (0=not present, 1 =

present)

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Table 5-17 User Entered PT Value

Address

Modbus Access

Address

Type

Attributes

Functional

Area

DESCRIPTION

Data / Control

0455,
0456

FP register R/W, WP User Entered PT Value

Default = 60 oF

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Page 44 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

6.0 Calibration

6.1 Calibration

Each process variable in the 3095FB [differential pressure (DP), static pressure (SP), and pro­cess temperature (PT)] can be trimmed. Two types of trims can be performed; offset (zero)
trim and slope (span) trim. To perform a trim the user only has to write the applied value to the
Modbus register while applying an accurate pressure or temperature to the 3095FB. For accu­rate trimming the user should wait for the process variable to stabilize before attempting to
trim the transmitter. The 3095FB will do all the calculations needed to trim the transmitter.

The host should never write the offset (zero) and slope (span) trims at the same time.

For example, if the user wants to trim the DP from 0 to 100 inches of H2O@60 F there are
four steps.

1. Apply the offset(zero) DP to the transmitter. In this case apply 0 inches of H2O@60 F
and wait for the transmitter to stabilize.

2. Write the IEEE 754 floating point number to the register pair 437, 438. In this case
write a zero to the register pair.

3. Apply the slope(span) DP to the transmitter. In this case apply 100 inches of H2O@60
F and wait for the transmitter to stabilize.

4. Write the IEEE 754 floating point number to the register pair 439,440. In this case
write the number 100 to the register pair.

Table 6-1 Calibration

Address

0437,
0438

0439,
0440

Modbus Access

Address

Type

FP register R/W, WP DP calibra-

FP register R/W, WP DP slope (span)

Attributes

Functional

Area

tion

DESCRIPTION

Data / Control

DP offset (zero)

0443,
0444

0445,
0446

FP register R/W, WP SP calibra-

tion

FP register R/W, WP SP slope (span)

Page 45 of 79

SP offset (zero)

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 6-1 Calibration

Address

0449,
0450

0451,

Modbus Access

Address

Type

Attributes

Functional

Area

FP register R/W, WP PT calibra-

tion

FP register R/W, WP PT slope (span)

DESCRIPTION

Data / Control

PT offset (zero)

0452

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

6.1.1 Calibration Flag

A Modbus coil has been provided as a way of flagging the transmitter as being in a Calibra­tion state. This coil is used only for informational use and does not affect the internal opera­tion of the 3095FB. The host has complete control of the Calibration Flag. When the
Calibration Flag is set, the corresponding status bit will turn ON.

It is recommended that this flag be turned on at the start of calibration, and then turned off
when the calibration is complete. The Calibration Flag is useful if for some reason the per­son performing a calibration on the 3095FB gets called away in the middle of the calibra­tion. The 3095FB may be in an unknown state, such as vented to atmosphere. If the
Calibration Flag is set, the host that is polling the 3095FB will be able to see the Calibration
status bit and mark the incoming data as unreliable.

Table 6-2 Calibration Flag

Address

Modbus Access

Address

Type

Attributes

Functional

Area

DESCRIPTION

Data / Control

0003 Coil R/W, WP Calibration Calibration Flag

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Page 46 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

6.2 Damping

A damping factor can also be entered for each process variable. The damping will smooth the
process variable reading when there are rapid input variations. The following damping values
(in seconds) are available. The underlined value is the default.

0.108 0.216 0.432 0.864 1.728 3.456 6.912 13.824 27.648

If the new damping value, sent by the host, is not one of the valid options, the closest damping
value will be selected. Only values of 0 to 30 seconds will be accepted by the 3095FB. If the
value is outside of this range a Modbus exception Illegal Data Value (03) will be returned.

Table 6-3 Damping

Address

0441,

Modbus Access

Address

Type

Attributes

Functional

Area

FP register R/W, WP Damping DP damping

DESCRIPTION

Data / Control

0442

0447,

FP register R/W, WP SP damping

0448

0453,

FP register R/W, WP PT damping

0454

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Page 47 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

6.3 Restore Factory Trim Defaults

Triggering the following coils will cause the 3095FB to revert to the Factory Trim Defaults.
The 3095FB must then be recalibrated.

Table 6-4 Reset Factory Trim Defaults

Modbus Access

Address

Address

Type

Attributes

Functional

Area

0031 Coil R/W, WP Reset Trim

DESCRIPTION

Data / Control

DP

to Factory

0032 Coil R/W, WP SP

Defaults

0033 Coil R/W, WP PT

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Page 48 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

7.0 LCD Display Configuration

If the 3095FB includes an optional LCD display, the user may select which configuration
parameters to display. This is accomplished by the use of the display bit map. The rate at which
the LCD display is updated is also configurable between one and ten seconds.

Table 7-1 Transmitter Info

Modbus Access

Address

0126 Holding

0127,
0128

Address

Type

register

Holding
register

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3

DESCRIPTION

Attributes

R/W, WP LCD LCD Update Rate (1 - 10 seconds)

R/W, WP LCD Display Bit Mask

located in the Modbus Protocol Guide)

Functional

Area

0x0000 0001
0x0000 0002
0x0000 0004
0x0000 0008

Data / Control

Differential Pressure
Static Pressure
Process Temperature
Communication Setup

Page 49 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

8.0 Exception Handling

There are a number of exceptions that may occur. The severity of these may range from a
warning to a critical error. The LCD (if present) will display the error condition depending on
the attributes of the exception. The following tables define the criteria and list the types of
alarms and their attributes.

8.1 Diagnostic Status Bits

There are a number of diagnostic status bits that can give information about the status of the
transmitter. The user can read the status bits as discrete inputs, input registers, or as floating
point registers. This gives the user a variety of ways to get the status of the transmitter. These
registers contain the exact same information. The status registers are placed next to the Float­ing Point PVs. In a polling environment the host should retrieve the PVs and the Status
Registers in a single query. Table 8.1, on page 50 shows the register layout of the diagnostic
status bits in each form (discrete input, input register, and floating point register). The float-

ing point status registers are in a bit mapped format.

A value of zero will indicate that the condition is FALSE (OFF), and a value of one will indi­cate that the condition is TRUE (ON). All reserved bits will be forced to FALSE (OFF).

Meaning of Attributes:
A = Critical Alarm State (Critical Alarm status bit is set)
W = Warning State (Warning status bit is set)
D = LCD will display exception

Table 8-1 Mapping of Status Bits to Coils, Input Registers, and Floating Point Registers

Discrete

Input

Address

0050 0119 0407 15 D Calibration Flag

0051 14 Critical Alarm: The PVs may not be valid

0052 13 Warning: The PVs are outside specification

0053 12 AD DP signal above Upper Range Limit + 10%

0054 11 W DP signal above Upper Range Limit

Input
Register
Address

Floating

Point
Register
Address

Bit

Position Attributes

Description

0055 10 DP signal above Upper Operating Limit

0056 9 DP signal below Lower Operating Limit

0057 8 W DP signal below Lower Range Limit

Page 50 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 8-1 Mapping of Status Bits to Coils, Input Registers, and Floating Point Registers

Discrete

Input

Address

0058 0119

0059 6 AD SP signal above Upper Range Limit + 10%

0060 5 W SP signal above Upper Range Limit

0061 4 SP signal above Upper Operating Limit

0062 3 SP signal below Lower Operating Limit

0063 2 W SP signal below Lower Range Limit

0064 1 AD SP signal below Lower Range Limit - 10%

0065 0 AD SP sensor shorted

0066 0120 0408 15 AD SP signal is unreasonable - open bridge

0067 14 AD PT signal above Upper Range Limit + 10%

0068 13 W PT signal above Upper Range Limit

0069 12 PT signal above Upper Operating Limit

Input
Register
Address

(cont)

Floating

Point
Register
Address

0407
(cont)

Bit

Position Attributes

7 AD DP signal below Lower Range Limit - 10%

Description

0070 11 PT signal below Lower Operating Limit

0071 10 W PT signal below Lower Range Limit

0072 9 AD PT signal below Lower Range Limit - 10%

0073 8 AD RTD is disconnected

0074 7 AD ST signal is above Upper Internal Limit

0075 6 AD ST signal is below Lower Internal Limit

5 Reserved

4 Reserved

3 Reserved

Inputs

Not Available as Discrete

0121 0409 15 AD Sensor module is NOT updating

2 Reserved

1 Reserved

0 Reserved

Page 51 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 8-1 Mapping of Status Bits to Coils, Input Registers, and Floating Point Registers

Discrete

Input

Address

Inputs

Not Available as Discrete

Input
Register
Address

0121 0409 15 AD Sensor module is NOT updating

0121
(cont)

Floating

Point
Register
Address

0409
(cont)

Bit

Position Attributes

14 Reserved

13 AD Sensor microprocessor does not respond

12 AD Sensor board eeprom burn failure

11 AD Sensor hardware incompatible with software

10 AD Sensor CRC error (Static Region)

9 AD Sensor CRC error (Dynamic Region)

8 Reserved

7 Reserved

6 Flash output board eeprom soft (recoverable)

error

5 AD Flash output board eeprom hard (non recover-

able) error

Description

4 Flash output board eeprom time out

3 Reserved

2 AD Nonvolatile Database CRC error

1 Write Protect Status

0 Reserved

**These registers are available at multiple Modbus addresses (see Section 2.3 located in the Modbus Protocol Guide)

Note: Not all of the diagnostic status bits are available as a discrete inputs. The rest of the diagnostic status bits can be read as
either an input register or as a floating point register.

8.1.1 Critical Alarm

The Critical Alarm status bit is linked to the status bits that could cause the PVs to be
incorrect. When a status bit with the Attribute A (Alarm) is set the Critical Alarm status bit
is also set.

8.1.2 Warning

The Warning status bit is linked to the status bits that signify that the transmitter may be
outside of specification. When a Status Bit with the Attribute W (Warning) is set the
Warning Status Bit is also set.

Page 52 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

9.0 Diagnostics

9.1 Self Test

A Self Test will verify the integrity of the some of the crucial areas of nonvolatile memory.

Table 9-1 Self Test

Modbus Access

Address

0001 Coil R/W Diagnos-

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

The procedure for performing a Self Test is as follows:

1. Force the Self Test coil ON. The 3095FB will return a normal response. The Self Test
takes approximately 500 ms.

2. Any errors that are detected will show up in the following status bits. The following
diagnostic status bits will be set or cleared by the Self Test, Master Reset, or cycling
power.

Address

Type

Attributes

the Modbus Protocol Guide)

Functional

Area

tics

DESCRIPTION

Data / Control

self test

Description

Sensor CRC error (Static Region)

Sensor CRC error (Dynamic Region)

Nonvolatile Database CRC error

Page 53 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

9.2 Master Reset

Activating the Master Reset coil performs a software reset of the 3095FB. This is similar to
shutting off the power and then reapplying power. The Master Reset takes approximately 500
milliseconds to complete.

Table 9-2 Master Reset

Modbus Access

Address

Address

Type

Attributes

Functional

Area

0002 Coil R/W Diagnos-

DESCRIPTION

Data / Control

Master Reset

tics

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide

9.3 Restoring Nonvolatile Database to Factory Defaults

Forcing the coils shown below to ON will reset the variables shown in the table below. The
transmitter must then be reset to ensure data integrity.

Table 9-3 Restoring Nonvolatile Database

Modbus Access

DESCRIPTION

Address

Address

Type

Attributes

0035 Coil R/W, WP Restore

Functional

Area

Restore Modbus Section 1
Nonvola­tile Data­base

Transmitter Address

Turnaround Delay Time

Calibration Flag

0036 Coil R/W, WP Restore Modbus Section 2

Message

Descriptor

Transmitter Tag

User Entered Date

Page 54 of 79

Data / Control

1
50 ms
OFF

32 spaces
16 spaces
8 spaces
April 10, 1996

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 9-3 Restoring Nonvolatile Database

Modbus Access

Address

Address

Type

Attributes

Functional

Area

0037 Coil R/W, WP Restore

Nonvola­tile Data­base

Restore Sensor Section 1

DP unit code

SP unit code

DESCRIPTION

PT unit code

RTD present flag

User Entered PT Value

Lower Operating Limits

Upper Operating Limits

0039 Coil R/W, WP Restore Trim Section 1

DP damping

SP damping

PT damping

Scale Integer Method

DP_y1

DP_y2

SP_y1

SP_y2

PT_y1

PT_y2

DP_x1

DP_x2

SP_x1

SP_x2

PT_x1

PT_x2

Maximum Integer

DP Scale Factor

DP Offset

SP Scale Factor

SP Offset

PT Scale Factor

PT Offset

Data / Control

Inches H20 @ 60 F
psi
F
ON
60 F
Lower Range Limit
Upper Range Limit

.864
.864
.864
0
0
65534
0
65534
0
65534

-250
250
0
800

-40
400
65534
131
18
81
32768
148
26848

0041 Coil R/W, WP Restore

Nonvola­tile Data­base

Restore LCD Section 1

LCD Bit Mask

LCD Update Rate

Page 55 of 79

0x0000 000f
3 seconds

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Table 9-3 Restoring Nonvolatile Database

Modbus Access

Address

Address

Type

Attributes

Functional

Area

0049 Coil R/W, WP Restore

Nonvola­tile Data-

Restore Mapping Section

Mapping Addresses

DESCRIPTION

Data / Control

base

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in the Modbus

Protocol Guide

)

Page 56 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Appendix A: Modbus Mapping Assignments by Data Types

Read/Write Coils

Modbus Access

Address

0001 Coil R/W Diagnos-

0002 Coil R/W Master Reset

0003 Coil R/W, WP Calibration Mode (set by host)

0004 Coil R/W, WP RTD present (0=not present, 1 =

0031 Coil R/W, WP Reset Trim

0032 Coil R/W, WP SP

0033 Coil R/W, WP PT

0035 Coil R/W, WP Restore

0036 Coil R/W, WP Restore Modbus Section 2

0037 Coil R/W, WP Restore Sensor Section 1

Address

Type

Attributes

Functional

Area

tics

to Factory
Defaults

Nonvola­tile Data­base

DESCRIPTION

Data / Control

Self Test

present)

DP

Restore Modbus Section 1

0039 Coil R/W, WP Restore Trim Section 1

0041 Coil R/W, WP Restore LCD Section 1

0049 Coil R/W, WP Restore Mapping Section

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Page 57 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Read Only Discrete Inputs

Modbus Protocol Guide

Address

0050­0075

Modbus Access

Address

Type

Attributes

Functional

Coil RO Diagnos-

tics

Area

DESCRIPTION

Data / Control

Status bits

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Floating Point Register Pairs

Address

Modbus Access

Address

Type

Attributes

Functional

Area

DESCRIPTION

Data / Control

0300­0400

0401,
0402

0403,
0404

0405,
0406

0407,
0408

0409,
0410

0411,
0412

0413,
0414

FP register Reserved for future use

FP register RO PVs DP

FP register RO SP

FP register RO PT

FP register RO Diagnos-

Status Bytes

tics

FP register RO Status Bytes

FP register RO Status Bytes

FP register RO Sensor lim-

DP upper range limit

its

Page 58 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Floating Point Register Pairs

Modbus Protocol Guide

Address

0415,
0416

0417,
0418

0419,
0420

0421,
0422

0423,
0424

0425,
0426

0427,
0428

Modbus Access

Address

Type

Attributes

Functional

Area

FP register RO Sensor lim-

DESCRIPTION

Data / Control

DP lower range limit

its

FP register R/W, WP DP upper operating limit

FP register R/W, WP DP lower operating limit

FP register RO SP upper range limit

FP register RO SP lower range limit

FP register R/W, WP SP upper operating limit

FP register R/W, WP SP lower operating limit

0429,
0430

0431,
0432

0433,
0434

0435,
0436

0437,
0438

0439,
0440

0441,
0442

FP register RO PT upper range limit

FP register RO PT lower range limit

FP register R/W, WP PT upper operating limit

FP register R/W, WP PT lower operating limit

FP register R/W, WP DP calibra-

DP offset

tion

FP register R/W, WP DP slope

FP register R/W, WP DP damping

Page 59 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Floating Point Register Pairs

Modbus Protocol Guide

Address

0443,
0444

0445,
0446

0447,
0448

0449,
0450

0451,
0452

0453,
0454

0455,
0456

Modbus Access

Address

Type

Attributes

Functional

Area

FP register R/W, WP SP calibra-

DESCRIPTION

SP offset

tion

FP register R/W, WP SP slope

FP register R/W, WP SP damping

FP register R/W, WP PT calibra-

PT offset

tion

FP register R/W, WP PT slope

FP register R/W, WP PT damping

FP register R/W, WP User

User Entered PT Value

Entered PT

Data / Control

0457,

FP register RO PVs ST

0458

0469,
0470

0471,

FP register RW PV Scaled

DP_x1

Integers

FP register RW DP_x2

0472

0473,

FP register RW SP_x1

0474

0475,

FP register RW SP_x2

0476

0477,

FP register RW PT_x1

0478

0479,

FP register RW PT_x2

0480

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3)

Page 60 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Input Registers

Modbus Protocol Guide

Modbus Access

Address

Address

Type

0001 Input reg-

ister

0002 Input reg-

ister

0003 Input reg-

ister

0004 Input reg-

ister

0005,
0006

0007,
0008

Input reg­ister

Input reg­ister

0009 Input reg-

ister

DESCRIPTION

Attributes

RO Identify

Functional

Area

Data / Control

manufacturer’s code (U8)

transmitter

RO transmitter type code (U8)

RO output board software rev level

(U8)

RO sensor module software rev level

(U8+U8)

RO sensor module serial number

(U32)

RO transmitter serial number (U24)

RO hardware rev level (U8)

0010 Input reg-

ister

0011 Input reg-

ister

0012­0015

Input reg­ister

RO Modbus specific rev level (U8)

RO Sensor Type (U8)

RO Reserved

Page 61 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Input Registers

Modbus Protocol Guide

Modbus Access

Address

Address

Type

0017 Input reg-

ister

0018 Input reg-

ister

0019 Input reg-

ister

0020 Input reg-

ister

0021 Input reg-

ister

0076,
0077

0078,
0079

0080,
0081

Input reg­ister

Input reg­ister

Input reg­ister

DESCRIPTION

Attributes

RO Transmit-

Functional

Area

Data / Control

DP Sensor Range Code (U8)

ter Info

RO SP Sensor Range Code (U8)

RO PT Sensor Range Code (U8)

RO Module Isolator Code (U8)

RO Module Fill Fluid Code (U8)

RO PVs

DP (U24)

Untrimmed

RO SP (U24)

and Cor­rected
Counts

RO PT (U24)

0082,
0083

0084,
0115

Input reg­ister

Input reg­ister

0116 Input reg-

ister

0117 Input reg-

ister

0118 Input reg-

ister

0119­0124

Input reg­ister

RO ST (U24)

RO Reserved

RO PV Scaled

DP

Integers

RO SP

RO PT

RO Diagnos-

Status Bytes(U16)

tics

Page 62 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Input Registers

Modbus Protocol Guide

Modbus Access

Address

Address

Type

0145 Input reg-

ister

Attributes

Functional

Area

RO Communi-

cation Sta-

DESCRIPTION

Data / Control

Framing Error Count

tistics

0146 Input reg-

RO Noise Error Count

ister

0147 Input reg-

RO Overrun Error Count

ister

0148 Input reg-

RO CRC Error Count

ister

0149 Input reg-

RO Busy Count

ister

0150 Input reg-

RO Good Message Count

ister

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Holding Registers

Modbus Access

Address

Address

Type

0016 Holding

register

0022 Holding

register

0023 Holding

register

0024 Holding

register

DESCRIPTION

Attributes

R/W, WP Transmit-

Functional

Area

Data / Control

transmitter address

ter Info

R/W, WP flange material code (U8)

R/W, WP flange type code (U8)

R/W, WP drain/vent code (U8)

Page 63 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Holding Registers

Modbus Protocol Guide

Modbus Access

Address

Address

Type

0025 Holding

register

0026 Holding

register

0027 Holding

register

0028 Holding

register

0029 Holding

register

0030,
0031

Holding
register

0060 Holding

register

0061 Holding

register

DESCRIPTION

Attributes

R/W, WP Transmit-

Functional

Area

Data / Control

O-ring gasket material (U8)

ter info

R/W, WP remote seal type (U8)

R/W, WP remote seal fill fluid (U8)

R/W, WP remote seal isolator material (U8)

R/W, WP number of remote seals (U8)

R/W, WP user-entered date

R/W, WP Modbus

DP

units codes

R/W, WP SP

for PVs

0062 Holding

register

0063­0075

Holding
register

0125 Holding

register

0126 Holding

register

0127,
0128

Holding
register

0131 Holding

register

0132 Holding

register

R/W, WP PT

R/W, WP Reserved Reserved

R/W, WP PV Scaled

Maximum Integer

Integers

R/W, WP LCD LCD Update Rate

R/W, WP LCD Display Bit Mask

R/W, WP Communi-

Turnaround Delay Time

cations

R/W, WP Floating Point Format Code

Page 64 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Holding Registers

Modbus Protocol Guide

Modbus Access

Address

Address

Type

0188 Holding

register

0189 Holding

register

0190 Holding

register

0191 Holding

register

0192 Holding

register

0193 Holding

register

0198 Holding

register

DESCRIPTION

Attributes

R/W, WP PV Scaled

Functional

Area

Data / Control

DP_y1

Integers

R/W, WP DP_y2

R/W, WP SP_y1

R/W, WP SP_y2

R/W, WP PT_y1

R/W, WP PT_y2

R/W, WP DP Scale Factor

0199 Holding

R/W, WP DP Offset

register

0200 Holding

R/W, WP SP Scale Factor

register

0201 Holding

R/W, WP SP Offset

register

0202 Holding

R/W, WP PT Scale Factor

register

0203 Holding

R/W, WP PT Offset

register

0204 Holding

R/W, WP Scaled Integer Method

register

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Page 65 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

ASCII Character Strings

Modbus Protocol Guide

Address

0032­0035

0036-

Modbus Access

Address

Type

Attributes

Functional

Area

ASCII R/W, WP Transmit-

ter info

ASCII R/W, WP user-entered descriptor(U8x16)

DESCRIPTION

Data / Control

user-entered tag (U8x8)

0043

0044-

ASCII R/W, WP user entered message (U8x32)

0059

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

the Modbus Protocol Guide)

Page 66 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Appendix B: Modbus Mapping Assignments by Register

Coils and Discrete Inputs

Modbus Protocol Guide

Modbus Access

Address

0001 Coil R/W Diagnos-

0002 Coil R/W Master Reset

0003 Coil R/W, WP Calibration Mode (set by host)

0004 Coil R/W, WP RTD present (0=not present, 1 =

0031 Coil R/W, WP Reset Trim

0032 Coil R/W, WP SP

0033 Coil R/W, WP PT

0035 Coil R/W, WP Restore

0036 Coil R/W, WP Restore Modbus Section 2

0037 Coil R/W, WP Restore Sensor Section 1

Address

Type

Attributes

Functional

Area

tics

to Factory
Defaults

Nonvola­tile Data­base

DESCRIPTION

Data / Control

Self Test

present)

DP

Restore Modbus Section 1

0039 Coil R/W, WP Restore Trim Section 1

0041 Coil R/W, WP Restore LCD Section 1

0049 Coil R/W, WP Restore Mapping Section

0050­0075

**These registers are available at multiple Modbus addresses (see Section 2.3 located in

Coil RO Diagnos-

tics

*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected

the Modbus Protocol Guide)

Page 67 of 79

Status bits

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Input and Holding Registers (includes Floating Point and ASCII registers)

Modbus Access

Address

Address

Type

0001 Input reg-

ister

0002 Input reg-

ister

0003 Input reg-

ister

0004 Input reg-

ister

0005,
0006

0007,
0008

Input reg­ister

Input reg­ister

0009 Input reg-

ister

DESCRIPTION

Attributes

RO Identify

Functional

Area

Data / Control

manufacturer’s code (U8)

transmitter

RO transmitter type code (U8)

RO output board software rev level

(U8)

RO sensor module software rev level

(U8+U8)

RO sensor module serial number

(U32)

RO transmitter serial number (U24)

RO hardware rev level (U8)

0010 Input reg-

ister

0011 Input reg-

ister

0012­0015

Input reg­ister

0016 Holding

register

RO Modbus specific rev level (U8)

RO Sensor Type (U8)

RO Reserved

R/W, WP Transmit-

Transmitter Polling Address

ter info

Page 68 of 79

Model 3095FB Multivariable Transmitter with Modbus Protocol

Modbus Protocol Guide

Input and Holding Registers (includes Floating Point and ASCII registers)

Modbus Access

Address

Address

Type

0017 Input reg-

ister

0018 Input reg-

ister

0019 Input reg-

ister

0020 Input reg-

ister

0021 Input reg-

ister

0022 Holding

register

0023 Holding

register

DESCRIPTION

Attributes

RO Transmit-

Functional

Area

Data / Control

DP Sensor Range Code (U8)

ter Info

RO SP Sensor Range Code (U8)

RO PT Sensor Range Code (U8)

RO Module Isolator Code (U8)

RO Module Fill Fluid Code (U8)

R/W, WP flange material code (U8)

R/W, WP flange type code (U8)

0024 Holding

register

0025 Holding

register

0026 Holding

register

0027 Holding

register

0028 Holding

register

0029 Holding

register

0030,
0031

Holding
register

R/W, WP drain/vent code (U8)

R/W, WP O-ring gasket material (U8)

R/W, WP remote seal type (U8)

R/W, WP remote seal fill fluid (U8)

R/W, WP remote seal isolator material (U8)

R/W, WP number of remote seals (U8)

R/W, WP user-entered date

Page 69 of 79