Flowserve MX-100 User Manual

USER INSTRUCTIONS

MX/DDC-100 Field Unit

FCD LMENIM2329-01 – 03/11

Installation

Operation

Maintenance

Experience In Motion

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

MX/DDC-100 Field Unit Installation and Operation Manual

©2011 Copyright Limitorque. All rights reserved. Printed in the United States of America.

Disclaimer

This document is meant for use with MX Installation and Operation Manual for MX-05 through MX-40. Information
in this document is also applicable to MX-85 through MX-150. No part of this book shall be reproduced, stored in a
retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise without
the written permission of Limitorque. While every precaution has been taken in the preparation of this book, the
publisher assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting
from the use of the information contained herein.

This document is the proprietary information of Limitorque, furnished for customer use ONLY. No other uses are
authorized without written permission from Limitorque.

Limitorque reserves the right to make changes, without notice, to this document and the product it describes.
Limitorque shall not be liable for technical or editorial errors or omissions made herein; nor for incidental and
consequential damages resulting from the furnishing, performance or use of this document.

The choice of system components is the responsibility of the buyer, and how they are used cannot be the liability of
Limitorque. However, Limitorque’s sales team and application engineers are always available to assist you in making
your decision.

This manual contains information that is correct to the best of Limitorque’s knowledge. It is intended to be a guide
and should not be considered as a sole source of technical instruction, replacing good technical judgment, since all
possible situations cannot be anticipated. If there is any doubt as to exact installation, configuration, and/or use, call
Limitorque at [phone]. The latest revisions to this document are available at www.flowserve.com.

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Contents

1 Introduction 5

1.1 Purpose 5

1.2 How to Use this Manual 5

1.3 User Safety 5

1.4 User Knowledge 6

1.5 DDC-100 System Capabilities and Features 6

1.6 General Specifications 7

2 System Components 8

2.1 Introduction 8

2.2 Hardware 8

2.2.1 MX Actuator 9

2.2.2 DDC–100 Field Unit 9

2.2.3 Host Controller 10

2.2.4 Master Station II 11

2.2.5 Network Cable 12

2.3 Software 13

2.3.1 Modbus Protocol 13

2.3.2 Modbus Function Codes 14

2.3.3 Modbus Function Code 01 (Read Coil Status) 14

2.3.4 Modbus Function Code 02 (Read Input Status) 15

2.3.5 Modbus Function Code 03 (Read Holding Register) 17

2.3.6 Modbus Function Code 04 (Read Input Register) 21

2.3.8 Modbus Function Code 06 (Preset Single Register) 23

2.3.9 Modbus Function Code 08 (Diagnostics) 26

2.3.10 Modbus Function Code 15 (Force Multiple Coils) 27

2.3.11 Modbus Function Code 16 (Preset Multiple Registers) 28

3 Installation and Configuration 30

3.1 Site and Network Cable Preparation 30

3.1.1 Site Preparation 30

3.1.2 Network Cable Preparation 30

3.2 Installation Verification 38

3.2.1 Network Cabling Installation Verification 38

3.2.2 Field Unit Installation Verification 38

3.3 Field Unit Configuration 39

3.3.1 Configuring Field Unit Parameters 39

3.4 Configuration Confirmation 44

3.4.1 Checking Connections 44

3.4.2 View Settings 44

3.4.3 Checking the Normal Display 44

4 Associated Documents 46
5 Troubleshooting 48
6 How to Order Parts 50
Appendix – Wiring Diagram 52
Appendix – MX/DDC Register Definitions 56
Appendix – Typical DDC-100 Network Installation Assignments 62

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Figures

Figure 1.1 – Typical DDC-100 system with or without a Master Station II 6
Figure 2.1 – MX-05 actuator 8
Figure 2.2 – DDC-100 field unit 9
Figure 2.3 – Typical direct-to-host arrangement 10
Figure 2.4 – Typical Master Station II (rear view) 11
Figure 2.5 – Redundant connection operation in redundant host loop topology 12
Figure 3.1 – Network connections 30
Figure 3.2 – Removing outer plastic jacket 31
Figure 3.3 – Separating cable parts 32
Figure 3.4 – Stripping conductors 32
Figure 3.5 – Applying heat shrink tubing 33
Figure 3.6 – Ring tongue connectors 33
Figure 3.7 – Connecting network cable to MX terminal block 34
Figure 3.8 – Redundant bi-directional loop topology 36
Figure 3.9 – Daisy chain topology 37
Figure 3.10 – Error Messages 44
Figure A.1 (1 of 2) – Typical MX/DDC-100 wiring diagram 52
Figure A.1 (2 of 2) – Typical MX/DDC-100 wiring diagram 53
Figure A.2 - MX Terminal block 54

Tables

Table 2.1 – Modbus function codes supported 14
Table 2.2 – DDC-100 coil assignments, Modbus 05 command usage for digital outputs 14
Table 2.3 – Status Bit Definitions 15
Table 2.3 – Status Bit Definitions (continued) 16
Table 2.4 – Register definitions 18
Table 2.4 – Register definitions (continued) 19
Table 2.4 – Register definitions (continued) 20
Table 2.5 – DDC-100 coil assignments, Modbus 05 command usage for digital outputs 22
Table 2.6 – Modbus 06 command and field unit holding register 40001 24
Table 2.7 – Diagnostic Codes Supported by the DDC-100 Field Unit 27
Table 3.3 – Network cable terminations 34
Table 3.4 – MX/DDC digital input configurations (only one selection per row is permitted) 42
Table 3.5 – MX/DDC digital inputs (cross-reference of various inputs) 42
Table 3.6 – Digital input voltages 43
Table 3.7 – MX/DDC digital outputs S1-2 and R1-8 43

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Introduction

1.1 Purpose

This manual explains how to install and operate the Flowserve Limitorque MX™/DDC-100 field unit and is to be used
as an addendum to Bulletin FCD LMENIM2306, MX Electronic Actuator Installation and Operation Manual. Up to 250
actuators, each containing a DDC-100 field unit, may be connected by a single twisted-pair cable to form a DDC-100
network. This network permits the actuators to be operated by various control room devices such as a distributed
control system (DCS), a programmable logic controller (PLC), or a personal computer (PC). The DDC-100 system
communicates status and alarm data from each MX and valve.

1.2 How to Use this Manual

Each section provides the MX user with information on installing and operating the MX field unit.

Section 1 - Introduction

Details user safety and knowledge requirements, system capabilities, and features.

Section 2 - System Components

Focuses on the description of the DDC-100 system hardware and software components.

Section 3 - Installation and Configuration

Provides details for installing and configuring a field unit.

Section 4 - Associated Documents

Provides a list of documents on related subjects for additional MX and DDC-100 system information.

Section 5 - Troubleshooting

Section 6 - How to Order Parts

Appendix A - Wiring Diagram

Details wiring connections.

Appendix B - MX/DDC Register Definitions

Appendix C - Typicl DDC-100 Network Installation Assignments

1.3 User Safety

Safety notices in this manual detail precautions the user must take to reduce the risk of personal injury and damage
to the equipment. The user must read and be familiar with these instructions before attempting installation, operation,
or maintenance. Failure to observe these precautions could result in serious bodily injury, damage to the equipment,

warranty void, or operational difficulty. User must follow local and state safety regulations.

Safety notices are presented in this manual in three forms:

WARNING: c Refers to personal safety. Alerts the user to potential danger. Failure to follow warning notices could

result in personal injury or death.

CAUTION: a Directs the user’s attention to general precautions that, if not followed, could result in personal injury
and/or equipment damage.

NOTE: Highlights information critical to the user’s understanding of the actuator’s installation and operation.

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

1

2

34

5

250

.

.

.

Host controller

Optional
Master
Station

Network
RS-485

MX field
units
(up to 250)

1.4 User Knowledge

It is recommended that the user read this manual in its entirety before the DDC-100 equipped actuator is installed and
operated.

The user needs to have a fundamental knowledge of electronics and microprocessor concepts. An understanding of
valve actuators and digital control systems is beneficial to the field unit user.

1.5 DDC-100 System Capabilities and Features

Limitorque’s distributed digital control (DDC) valve control network supports up to 250 actuators over a single
twisted-pair cable using Modbus™ protocol. MX actuators and other devices can be accessed from a control room
for integration with a plant asset management (PAM) system, distributed control system (DCS), programmable
logic controller (PLC), or personal computer (PC) based network. The DDC-100 system consists of a host system,
controller, network, and field units. A typical DDC-100 system is shown in Figure 1.1.

Figure 1.1 – Typical DDC-100 system with or without a Master Station II

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

1.6 General Specifications

Direct-to-Host Specifications:

Direct connection to host controller•

Communicates using the Modbus protocol and the RS-485 electrical standards•

Configurable bitmap•

High-level surge protection on network•

Network Specifications:

Redundant bi-directional loop or daisy chain topology•

Modbus protocol and the RS-485 electrical standards•

High speed—up to 19.2 kbaud communications•

MX Field Unit Specifications:

“• OPEN,” “STOP,” and “CLOSE” commands

“• ESD” and “MOVE–TO” position commands

Actuator status and alarm messages•

Six digital inputs and two analog inputs for user (see • Table 2.2, Register Definitions)

Two surge-protected and mutually isolated communication channels•

MX local control panel configuration•

Torque output (for reference only) and position feedback•

User’s analog input feedback•

Nine digital outputs maximum (three standard/six optional)•

Master Station II (Optional) Specifications:

Supports all Limitorque DDC-100 field units: MX, L120, LY•

Controls up to 250 MOVs•

User-friendly touch panel operator interface:•

Permits configuration and control of DDC-100 network•

Configures communication to host or DCS (Distribution Control System)•

Password protected•

Optional Hot Standby Configuration: Automatically assumes control on Primary Master Failure or on command •
from the DCS or touch panel

Provides realtime status of field units through continuous cyclical polling•

Modbus RTU and TCP/IP:•

Addressable•

RS-232/485/422•

10/100 baseT•

Built-in Web server for ease of actuator and network diagnostics•

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Piece Description

1 Handwheel
2 Declutch Lever
3 Oil Fills (dotted arrow depicts fill on declutch side)
4 Controls Compartment (field unit location)
5 LCD Display
6 Control Knobs
7 Ground Lug
8 Thrust/Torque Base
9 Conduit Entries
10 Terminal Compartment
11 Motor
12 Nameplate

1

2

3

7

8

4

5

11

12

10

6

9

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

System Components

2.1 Introduction

This section gives an overview of the components used in the DDC-100 system. The field unit is installed in each MX
actuator. The network cable connects the field unit to the network via the actuator terminal block. The network cable is
connected to a host controller or Master Station II.

2.2 Hardware

NOTE: Recommended storage procedures are detailed in Bulletin FCD LMENIM2314, MX Maintenance and Spare
Parts Manual. Failure to comply with recommended procedures will void the warranty. For longer-term storage,

contact Flowserve for procedures and recommendations.

Figure 2.1 – MX-05 actuator

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

2.2.1 MX Actuator

The MX is a multi-turn valve actuator designed for operation of ON-OFF and modulating valve applications. This
actuator controls the opening and closing of valves. See Figure 2.1.

Features of the MX include:

Non-intrusive setup•

Separately sealed terminal chamber•

Absolute encoder for valve position sensing (no battery required) •

32-character graphical LCD display with 180° rotation •

Sophisticated electronic control, monitoring, and diagnostic capabilities with LimiGard™ technology •

2.2.2 DDC–100 Field Unit

The DDC-100 field unit is installed in the MX controls compartment. This unit permits the actuator to be controlled by
a host controller or Master Station II via the DDC-100 network. The field unit includes two high-level, surge-protected,
and isolated network communication channels, configurable digital I/O, and configuration via LCD screen. The
following commands and information may be transmitted over the DDC-100 network:

“• OPEN,” “STOP,” and “CLOSE” commands

“• ESD” and “MOVE–TO” position commands

Actuator status and alarm messages•

Six digital inputs and two analog inputs for user (see • Table 2.2, Register Definitions)

Two surge-protected and mutually isolated communication channels•

MX local control panel configuration•

Torque output (for reference only) and position feedback•

User’s analog input feedback•

Nine digital outputs maximum (three standard/six optional)•

Figure 2.2 – DDC-100 field unit

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

DCS PC/PAM PLC

1 250

52

3 4

RS-485

2.2.3 Host Controller

In the DDC-100 system, the network can be connected directly to a host controller without an interposing Master
Station II.

In this configuration, the host sends commands and messages to, and gathers responses from, the field units. The
commands and messages are sent via RS-485 data signals. The gathered responses are stored in a data table in the
host and are periodically updated by sequential polling of the field units. The host controls up to 250 field units. See
Section 3.1.2.3, Network Cable Connection to Host System or Master Station II.

When a host controller is used to directly communicate with the field units, i.e., direct-to-host communications, it
communicates using the Modbus protocol and the RS-485 electrical standard. This host controller can be one of the
following:

Distributed control system (DCS)•

Programmable logic controller (PLC) •

Personal computer (PC)•

Plant Asset Management (PAM) system•

Figure 2.3 – Typical direct-to-host arrangement

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-00 – 2/08

o

l

FUSES

FUSES

l

o

ETHERNET

DO NOT USE

SINGLE

--

+

24VDC

PROPER OPERATION

INSIDE OF UNIT FOR

INPUT ONLY

EXTERNAL 24VDC

MOVE JUMPERS ON

250 V

INPUT

POWER

~1.5A

100-240VAC

ON

OFF

FUSES
2 AMP

DCS

DATA *

GND

CHANNEL B

PRINTER / DEBUG

WITH 110-240VAC

OPTIONAL

DO NOT USE

HOT STANDBY

GND

DATA *

DATA

DCS

PRINTER / DEBUG

ON

OFF

~1.5A

INPUT

100-240VAC

250 V

POWER

2 AMP

FUSES

--

+

24VDC

PROPER OPERATION

INSIDE OF UNIT FOR

INPUT ONLY

EXTERNAL 24VDC

MOVE JUMPERS ON

WITH 110-240VAC

CHANNEL A

DATA

NO SERVICEABLE PARTS INSIDE

1

2

3

5

4

6

9

7

8

10

2.2.4 Master Station II

A Master Station II may be used in the DDC-100 system. Master Station II’s are normally located in the control room,
and serve as the interface between the field units and the host controller. The following functions are provided:

Continuous polling of actuator network•

Message routing to/from field units •

Data concentration •

Data logging •

In this configuration, the Master Station II receives commands from a host controller. The Master Station II communi­cates with the host controller using the Modbus Protocol and the RS-232 or RS-485 electrical standard. See Bulletin
FCD LMENIM5001, DDC-100 Master Station II Installation and Operation Manual for details.

The Master Station II sends commands and messages to, and gathers responses from, the field units. The
commands and messages are sent via RS-485 data signals. The gathered responses are stored in a poll table in the
Master Station II and are periodically updated by sequential polling of the field units. The Master Station II controls up
to 250 field units. See Section 3.1.2.3, Network Cable Connection to Host System or Master Station II.

Figure 2.4 – Typical Master Station II (rear view)

1. Ethernet ports

2. Printer/Debug port

3. DCS port

4. Auxiliary 24 VDC power connection

5. Main power switch and connector for 120-240 VAC

6. Electrostatic ground

7. Hot Standby unit main power switch and connector for 120-240 VAC

8. Hot Standby auxiliary 24 VDC power connection

9. Hot Standby DCS Port

10. Hot Standby Printer/Debug Port

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Signal initiated from host fails to reach
field unit which is located after fault...

Instead, signal routes to field unit using
other side of the loop cable and
completes connection.

2.2.5 Network Cable

The network consists of a shielded, twisted-pair cable that connects all field units and the host/Master Station II. The
cable is normally connected in a loop fashion so that any single break or short will not disable communication.

Figure 2.5 – Redundant connection operation in redundant host loop topology

12

The network cable connects the field units to the host controller or Master Station II. Belden 3074F, 3105A, or 9841
shielded, twisted-pair cable should be used. The use of other cables may result in a reduction of internodal distances
or increased error rate, and is the user’s responsibility.

Belden 3074F Specifications

Key Specifications

Total cable length between repeaters or nodes with repeaters, up to 19.2 kbps: 5000 ft (1.52 km) For loop •
mode, this is the total length between operating field units. If a field unit loses power, then the relays internal
to the field unit connect the A1 Channel to the A2 Channel, which effectively doubles the length of the cable
(assuming a single field unit fails). To ensure operation within specifications in the event of power failure to
field units, this consideration must be added. Example: To ensure operation within specification when any two
consecutive field units lose power, the maximum length of cable, up to 19.2 kbps, should not exceed 5000 ft
(1.52 km) per every four field units. See Section 3.1.2.3, Network Cable Connection to Host Controller or
Master Station II.

Resistance/1000 ft = 18 AWG (7 x 26) 6.92 ohms each conductor (13.84 ohms for the pair)•

Capacitance/ft = 14 pF (conductor-to-conductor)•

Capacitance/ft = 14 pF (conductor-to-shield)•

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Belden 3105A Specifications

Total cable length between repeaters or nodes with repeaters, up to 19.2 kbps: 4500 ft (1.37 km) For loop •
mode, this is the total length between operating field units. If a field unit loses power, then the relays internal
to the field unit connect the A1 Channel to the A2 Channel, which effectively doubles the length of the cable
(assuming a single field unit fails). To ensure operation within specifications in the event of power failure to
field units, this consideration must be added. Example: To ensure operation within specification when any two
consecutive field units lose power, the maximum length of cable, up to 19.2 kbps, should not exceed 4500 ft
(1.37 km) per every four field units. See Section 3.1.2.3, Network Cable Connection to Host Controller or

Master Station II.

Key Specifications

Resistance/1000 ft = 22 AWG (7 x 30) 14.7 ohms each conductor (29.4 ohms for the pair)•

Capacitance/ft = 11.0 pF (conductor-to-conductor)•

Capacitance/ft = 20.0 pF (conductor-to-shield)•

Belden 9841 Specifications

Total cable length between repeaters or nodes with repeaters: up to 19.2 kbps: 3500 ft (1 km) For loop mode, •
this is the total length between operating field units. If a field unit loses power, then the relays internal to the
field unit connect the A1 Channel to the A2 Channel, which effectively doubles the length of the cable (assuming
a single field unit fails). To ensure operation within specifications in the event of power failure to field units, this
consideration must be added. Example: To ensure operation within specification when any two consecutive
field units lose power, the maximum length of cable, up to 19.2 kbps, should not exceed 3500 ft (1 km) per
every four field units. See Section 3.1.2.3, Network Cable Connection to Host Controller or Master Station II.

Key Specifications

Resistance/1000 ft = 24 AWG (7 x 32) 24 ohms each conductor (48 ohms for the pair)•

Capacitance/ft = 12.8 pF (conductor-to-conductor)•

Capacitance/ft = 23 pF (conductor-to-shield)•

2.3 Software

2.3.1 Modbus Protocol

The Modbus protocol was developed by AEG Modicon® for communicating to various networked devices. The
relationship between these devices and a central controller is called a master-slave relationship in which the master
(host device) initiates all communication. The slave devices (DDC-100 field units in the actuators) respond to the
queries from the master.

Modbus only permits one device to communicate at any given time (simultaneous communication is prohibited) to
ensure process control integrity.

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

2.3.2 Modbus Function Codes

The controlling device (master) must conform to the Modbus protocol as defined in the Modbus-IDA Modbus
Application Protocol Specification V1.1a (http://www.Modbus-IDA.org) and support Modbus function codes 01
through 06, 08, 15, and 16. These function codes are a subset of the complete protocol and are defined in Table 2.1.

Table 2.1 – Modbus function codes supported

Extended
Function Bit/Register Addressing
Code Name Addressing Range

01 Read Coil Status Bit 0,000 - 9,999
02 Read Discrete Inputs Bit 10.000 - 19,999
03 Read Holding Register Register 40,000 - 49,999
04 Read Input Register Register 30,000 - 39,999
05 Force Single Coil Bit 0,000 - 9,999
06 Preset Single Register Register 40,000 - 49,999
08 Diagnostics N/A N/A
15 Force Multiple Coils Bit 0,000 - 9,999
16 Preset Multiple Registers Register 40,000 - 49,999

See Table 2.2 for a complete listing of MX/DDC holding registers.

2.3.3 Modbus Function Code 01 (Read Coil Status)

This function code is used to read the coil status in the DDC-100 Field Unit. There are nine coils available to be read
on DDC-100 Field Units as shown in Table 2.2. For the MX/DDC, Coil 1 indicates CLOSE contactor and is interlocked
with Coil 2, Coil 2 indicates OPEN contactor and is interlocked with Coil 1. When the I/O Module is used in non-MOV
(motor-operated valve) mode, relays 1 through 6 or coils 3 through 8 are available for user configuration.

Table 2.2 – DDC-100 coil assignments, Modbus 05 command usage for digital outputs

Coil Number Bit Number Function

1 00 Close/Stop
2 01 Open/Stop
3 02 S1 or R1 (Opt) Latched
4 03 S2 or R2 (Opt) Latched
5 04 R3 (Opt) Latched
6 05 R4 (Opt) Latched
7 06 R5 (Opt) Latched
8 07 R6 (Opt) Latched
9 08 R7 (Opt) Latched
10 09 R8 (Opt) Latched

The normal response to the (05) command is an echo of the command.

Example

Poll field unit number 3 for 8 coils starting at coil 1.

Query: 0301000000083C2E

14

Response: 03010118503A

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Message Breakdown

Query Response

03 Slave (Field Unit) Address 03 Slave (Field Unit) Address

01 Function 01 Function

00 Starting Address Hi 01 Byte Count

00 Starting Address Lo 18

00 No. of Points Hi 503A Error Check (CRC)

08 No. of Points Lo

3C2E Error Check (CRC)

Note 1: 18h equals 00011000 or coils 4 and 5 are ON.

1

Data (Coils 8 - 1)

2.3.4 Modbus Function Code 02 (Read Input Status)

This function code is used to read the discrete input status bits in the DDC-100 Field Unit. The use of this function
code will provide the user with the input status bits that are used to develop holding registers 9 through 13. The
status bit inputs are contained in locations 10129-10208 for each DDC-100 Field Unit and are defined in Table 2.3.

Table 2.3 – Status Bit Definitions

Bit Number

129 128 Opened

130 129 Closed

131 130 Stopped in mid-travel

132 131 Opening

133 132 Closing

134 133 Valve jammed

135 134 Not in remote

136 135 Combined fault

137 136 Over-temperature fault

138 137 Actuator failing to de-energize

139 138 Channel A fault

140 139 Channel B fault

141 140 Open torque switch fault

142 141 Close torque switch fault

143 142 Valve operated manually fault

144 143 Phase error

145 144 Open inhibit active

146 145 Close inhibit active

147 146 Not used

148 147 Not used

149 148 One or more phases is missing

150 149 Reverse phase sequence is occurring

151 150 ESD conflict

152 151 Inhibit conflict

153 152 Use in local/stop (input must be set for CSE and enabled)

154 153 Not used

155 154 Network emergency shutdown (ESD) is active

156 155 Local emergency shutdown is active

Modbus

Bit

Address

MX/DDC

15

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Table 2.3 – Status Bit Definitions (continued)

Bit Number

157 156 Field unit microprocessor has reset since the last poll

158 157 MX in stop move

159 158 Opening in local mode

160 159 Closing in local mode

161 160 Close contactor (interlocked)

162 161 Open contactor (interlocked)

163 162 S1 or R1 (opt)

164 163 S2 or R2 (opt)

165 164 R3 (opt)

166 165 R4 (opt)

167 166 R5 (opt)

168 167 R6 (opt)

169 168 R7 (opt)

170 169 Network relay

171 170 R8 (opt)

172 171 Not used

173-176 172-175 Mov series (0=1, A=9)

177 176 Remote switch

178 177 Thermal overload

179 178 Open torque switch

180 179 Open limit switch

181 180 Close torque switch

182 181 Close limit switch

183 182 Not used

184 183 Not used

185 184 User Input 0

186 185 User Input 1

187 186 User Input 2

188 187 Remote stop input

189 188 Remote open input

190 189 Remote close input

191 190 Not used

192 191 Not used

193 192 Analog board 1 present

194 193 Analog board 2 present

195 194 Analog Input #1 lost

196 195 Analog Input #2 lost

197 196 Network Channels A/B timed out

198 197 Relay board R5-R8 present

199 198 DDC board present

200 199 Relay board R1-R4 and RM present

201 200 FF board present

202 201 PB PA board present

203 202 CLE assigned for input 2

204 203 DNET board present

Modbus

Bit

Address

MX/DDC

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Table 2.3 – Status Bit Definitions (continued)

Bit Number

205 204 Lost Phase Input

206 205 Phase Reverse Input

207 206 Not used

208 207 PB DP board present

Example

Poll field unit number 22 for 16 inputs starting at input 129 with the actuator opening.

Query: 1602008000107B09

Response: 1602020108CDED

Message Breakdown

Query Response

16 Slave (Field Unit) Address 16 Slave (Field Unit) Address

02 Function 02 Function

00 Starting Address Hi 02 Byte Count

80 Starting Address Lo 01

00 No. of Points Hi 08

10 No. of Points Lo CDED Error Check (CRC)

7B09 Error Check (CRC)

Note 1: 01h equals 0000 0001 (actuator open input bit is ON).

Modbus

Bit

Address

MX/DDC

1

Data (Inputs 10136 - 10129)

2

Data (Inputs 10144 - 10137)

Note 2: 08h equals 0000 1000 (actuator Channel B Fail bit is ON).

2.3.5 Modbus Function Code 03 (Read Holding Register)

This function code is used to read the binary contents of holding registers in the DDC-100 Field Unit. This function
code is typically used during the network polling cycle. A network poll should consist of field unit registers 9 (Status)
and 10 (Fault) as a minimum. Holding register 8 should also be polled when the actuator is configured for the analog
feedback option or position control. See Table 2.4 for a complete listing of the holding registers.

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Table 2.4 – Register definitions

Register # Description Meaning

1 Command Registers 1 and 2 are write-only registers used for Modbus
Function Code 06
2 Argument Registers 1 and 2 are write-only registers used for Modbus
Function Code 06
3 Analog Output 1 Analog Output 1 Value (Default 0-100)
4 Analog Output 2 Analog Output 2 Value (Default 0-100)
5 Analog Input Main Power (Volts)
6 Analog Input Analog Input 1 (Default 0-100)
7 Analog Input Analog Input 2 (Default 0-100)
8 Position Valve Position, Scaled Value (Default 0-100)
9 Status Register 16 Bits of field unit status:
Bit 0 Opened
Bit 1 Closed
Bit 2 Stopped in Mid-Travel
Bit 3 Opening
Bit 4 Closing
Bit 5 Valve jammed
Bit 6 Not in Remote
Bit 7 Combined fault

2

3

Bit 8 Over temperature fault
Bit 9 Future Implementation
Bit 10 Network Channel A fault
Bit 11 Network Channel B fault
Bit 12 Open torque switch fault
Bit 13 Close torque switch fault
Bit 14 Valve-operated manually fault

Bit 15 Phase error

NOTE 1: Default value is scaled 0-100 of span. Changes made to “Analog Scale” affect analog registers (3, 4, 6, 7, 8)

and “move-to” commands. (0-100, 0-255, 0-4095)

1

1

1

User 4-20 mA / 0-20 mA Input

1

User 4-20 mA / 0-20 mA Input

4

(Terminals 5 and 4)

4

(Terminals 13 and 14)

1

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NOTE 2: MX/DDC actuators shipped after 2nd QTR, 1999, have the following definition of Register 9 Bit 6. When this

bit has a value of 1 or true, the actuator is in LOCAL or STOP (unavailable for network control). The actuator
selector switch in REMOTE (available for network control) is indicated by Register 12 Bit 0 having a value of 1
or true.

IMPORTANT: Verify host program when installing an MX/DDC actuator shipped after 2nd QTR, 1999, on a network
commissioned before 2nd QTR, 1999, for proper indication of selector switch values. Failure to verify proper selector
switch indication at the host may cause unsafe conditions at the facility.

MX/DDC actuators shipped prior to 2nd QTR, 1999, have the following definition for Register 9 Bit 6. When this bit has
a value of 1 or true, the actuator selector switch is in LOCAL mode. This bit does not indicate STOP or REMOTE. The
actuator selector switch in REMOTE (available for network control) is indicated by Register 12 Bit 0 having a value of 1
or true. Register 9 Bit 6 value 0 (zero) or false AND Register 12 Bit 0 value 0 (zero) or false indicates selector switch is
in the STOP position.

NOTE 3: Combined Fault bit is high when Bit 5 or 8 or 9 or 15 or (Bits 10 and 11) is high.

NOTE 4: Channel A is physical connection A1. Channel B is physical connection A2. (See Appendix A.)

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Table 2.4 – Register definitions (continued)

Register # Description Meaning

10 Fault Register 16 Bits of field status
Bit 0 Open inhibit active
Bit 1 Close inhibit active
Bit 2 Not Used
Bit 3 Not Used
Bit 4 One or more phases are missing
Bit 5 Reverse phase sequence is occurring
Bit 6 ESD conflict
Bit 7 Inhibit conflict
Bit 8 CSE in local/stop (input must be set for CSE and enabled)
Bit 9 Not Used
Bit 10 Network emergency shutdown is active
Bit 11 Local PB emergency shutdown is active
Bit 12 Field unit microprocessor has reset since the last poll
Bit 13 MX in stop mode
Bit 14 Opening in local mode
Bit 15 Closing in local mode
11 Digital Outputs Value of 16 Digital Outputs
Bit 0 Close contactor (Interlocked)
Bit 1 Open contactor (Interlocked)
Bit 2 S1 or R1 (Opt)
Bit 3 S2 or R2 (Opt)
Bit 4 R3 (Opt)
Bit 5 R4 (Opt)
Bit 6 R5 (Opt)
Bit 7 R6 (Opt)
Bit 8 R7 (Opt)
Bit 9 Network Relay
Bit 10 R8 (Opt)
Bit 11 Not Used
BIT 12-15 MOV Series (0 = 1, A = 9)
12 Digital Inputs 1 Value of 16 Digital Inputs
Bit 0 Remote Switch
Bit 1 Thermal Overload
Bit 2 Open Torque Switch
Bit 3 Open Limit Switch
Bit 4 Close Torque Switch
Bit 5 Close Limit Switch
Bit 6 Not Used
Bit 7 Not Used
Bit 8 User Input 0 (Default=ESD), Terminal 30
Bit 9 User Input 1 (Default=Open Inhibit), Terminal 34
Bit 10 User Input 2 (Default=Close Inhibit), Terminal 35
Bit 11 Remote Stop Input, Terminal 26
Bit 12 Remote Open Input, Terminal 25
Bit 13 Remote Close Input, Terminal 27
Bits 14-15 Not Used

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Table 2.4 – Register definitions (continued)

Register # Description Meaning

13 Digital Inputs 2 Value of 16 Digital Inputs
Bit 0 Analog board 1 present
Bit 1 Analog board 2 present
Bit 2 Analog Input 1 lost
Bit 3 Analog Input 2 lost
Bit 4 Network Channels A/B timed out
Bit 5 Relay board R5-R8 present
Bit 6 DDC board present
Bit 7 Relay board R1-R4 and RM present
Bit 8 Foundation Fieldbus board present
Bit 9 Profibus PA board present
Bit 10 CSE chosen for input 2
Bit 11 DeviceNet board present
Bit 12 Phase lost
Bit 13 Phase reverse
Bit 14 Not Used
Bit 15 Profibus DP board present
14 Timers and Analog Channels Internal compartment temperature
15 User Faults Bits 0-15 Not Used
16 Current State Bits 0-15 Not Used
17 Field Unit Holding Register Special Applications Only
18 Field Unit Holding Register Special Applications Only
19 Field Unit Holding Register Special Applications Only
20 Field Unit Holding Register Special Applications Only
21 Field Unit Holding Register Special Applications Only
22 Field Unit Holding Register Special Applications Only
23 Field Unit Holding Register Special Applications Only
24-44 Reserved Special Applications Only
45-47 Not Named Special Applications Only
48 TP_START_POSITION Special Applications Only
49 TP_STOP_POSITION Special Applications Only
50 TP_SAMPLE Special Applications Only
51 TP_MID_T_HIGH Special Torque Applications Only
52 TP_MID_T_POS Special Applications Only
53 TP_MID_T_AV_VAL Special Torque Applications Only
54 TP_STOP_VAL Special Applications Only
55 TP_BEFORE_ MID_T_HIGH Special Torque Applications Only
56 TP_AFTER_ MID_T_HIGH Special Torque Applications Only

Note 1: Range is +90°C to -55°C. High byte 00 indicates positive (+) and 01 indicates negative (-). Low byte indicates temperature

value.
Example: 0x0019 = +25°C

0x011E = -30°C

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Example

Poll field unit number 125 for 3 registers starting at register 8 with the actuator stopped between the limits and in
local mode.

Query: 7D0300070003BFF6

Response: 7D0306003D084400003E07