Flowserve DDC-100 User Manual

DDC-100

Direct-to-Host

Programming Guide

FCD LMAIM4019-00

(Replaces 435-23009)

Network Control Systems

Contents

1 Introduction 1

1.1 Premise 1

1.2 Emphasis 1

1.3 Audience 2

2 Direct-to-Host Valve Control 3

2.1 Advantages of Direct-to-Host Control 3

2.2 Deliverables for Successful Direct-to-Host Implementations 4

3 Field Unit Monitoring and Control 5

3.1 Use of Coils and Registers for Monitoring and Control 5

3.2 Modbus 6

3.2.1 Modbus Function Code 01 (Read Coil Status) 7

3.2.2 Modbus Function Code 02 (Read Input Status) 8

3.2.3 Modbus Function Code 03 (Read Holding Register) 11

3.2.4 Modbus Function Code 04 (Read Input Register) 18

3.2.5 Modbus Function Code 05 (Force Single Coil) 18

3.2.6 Modbus Function Code 06 (Preset Single Register) 19

3.2.7 Modbus Function Code 08 (Diagnostics) 23

3.2.8 Modbus Function Code 15 (Force Multiple Coils) 24

3.2.9 Modbus Function Code 16 (Preset Multiple Registers) 24

4 The DDC-100 Network 27

Belden 3074F Specifications 27
Belden 3105A Specifications 28
Belden 9841 Specifications 28

4.1 Field Unit Network Communication Channels 28

4.1.1 Field Unit Network Bypass Relays 29

4.1.2 Field Unit Repeater Circuits 29

4.2 Network Topologies 29

4.2.1 Redundant Loop 29

4.2.2 Single-Ended Loop 31

4.2.3 Single-Line Multi-drop 32

4.3 Network Polling 33

4.3.1 Network Communication Errors 35

4.3.2 Network Communication Examples 36

4.4 Network Control 38

4.4.1 Ladder Logic Routines 38

4.4.2 Software Control Modules (C++ or Visual Basic Program) 38

4.4.3 Personal Computer with a Graphical User-Interface 39

5 Interfacing Hardware for the DDC-100 Network 41

5.1 RS-232 to RS-485 Converters 41

5.1.1 RS-232/RS-485 Control Line Steered Converter (P/N 61-825-0966-4) 43

5.1.2 RS-232/RS-485 Converter with RS-485 Self-Steering (P/N 61-825-1032-4) 45

5.2 RS-485 Connection Direct to the DDC-100 Field Unit 48

6 Programming Recommendations 49

6.1 Monitoring Field Unit Status 49

6.2 Issuing Control Commands 50

A Typical DDC-100 Network Installation Assignments 53

Project supplier responsibilities 53

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Figures

Figure 4.1 – DDC-100 Redundant Loop Network 30
Figure 4.2 – DDC-100 Single-Ended Loop Network 31
Figure 4.3 – DDC-100 Single-Line Multi-Drop Network 33
Figure 5.1 – RS-232/RS-485 Converter Dimensions and Rack Mount Kit 43
Figure 5.2 – RS-232/RS-485 Cable Diagram 43
Figure 5.3 – Front and Back Panels of Steered Converter 44
Figure 5.4 – Front and Back Panels of Self-Steering Converter 46

Tables

Table 3.1 – Field Unit Communication Parameters 5
Table 3.2 – Modbus Function Codes Supported 7
Table 3.3 – DDC-100 Coil Assignments, Modbus Function Code 01 Usage for Digital Outputs 8
Table 3.4 – Status Bit Definitions 8
Table 3.4 – Status Bit Definitions (continued) 9
Table 3.5 – Field Unit Register Definitions 12
Table 3.6 – DDC-100 Coil Assignments Modbus Function Code 05 Usage for Digital Outputs 19
Table 3.7 – Modbus 06 Command and Field Unit Holding Register 40001 20
Table 3.8 – Diagnostic Codes Supported by the DDC-100 Field Unit 23
Table 4.1 – Average Field Unit Response Time 34
Table 4.2 – Average Network Scan Time (seconds) 35
Table 5.1 – RS-232/RS-485 Converter Specifications 42
Table 5.2 – Steered Converter Assembly (P/N 22300-7591) 42
Table 5.3 – Self-Steering Converter Assembly (P/N 22300-7601) 42
Table 5.4 – RS-232/RS-485 Converter (P/N 61-825-0966-4) DIP Switch Functions 44
Table 5.5 – RS-232/RS-485 Converter (P/N 61-825-0966-4) RS-232 Connector 44
Table 5.6 – RS-232/RS-485 Converter (P/N 61-825-0966-4) RS-485 Connector 45
Table 5.7 – RS-232/RS-485 Converter (P/N 61-825-0966-4) Jumpers 45
Table 5.8 – RS-232/RS-485 Converter (P/N 61-825-1032-4) RS-232 Connector 46
Table 5.9 – RS-232/RS-485 Converter (P/N 61-825-1032-4) RS-485 Connector 46
Table 5.10 – RS-232/RS-485 Converter (P/N 61-825-1032-4) Jumpers
Table 6.1 – Sample Tag Table for Direct-to-Host applications 51

1 47

Introduction

1

1.1 Premise

This Programming Guide was written for the user who is connecting Flowserve Limitorque
DDC-100 Network-compatible valve actuators directly to a control system Host computer. These
guidelines provide the information that is necessary to control and monitor the valve actuators
through a serial data communications network.

Your safety and satisfaction are very important to Flowserve. Please follow all instructions carefully
and pay special attention to safety.

1.2 Emphasis

The following methods will be used to emphasize text throughout this manual:

WARNING: Refers to personal safety. This alerts the reader to potential danger or harm.

c

Failure to follow the advice in warning notices could result in personal injury or death.

CAUTION: Directs attention to general precautions, which, if not followed, could result in

a

personal injury and/or equipment damage.

NOTE: Highlights information critical to the understanding or use of these products.

Bold text highlights other important information that is critical to system components.

CAPITALIZED text stresses attention to the details of the procedure.

Underlined text emphasizes crucial words in sentences that could be misunderstood if the word is
not recognized.

The purpose of these emphasized blocks of text is to alert the reader to possible hazards associated
with the equipment and the precautions that can be taken to reduce the risk of personal injury and
damage to the equipment.

Read and become familiar with the material in these guidelines before attempting installation,
operation, or maintenance of the equipment. Failure to observe precautions could result in serious
bodily injury, damage to the equipment, or operational difficulty.

ii DDC-100 Direct-to-Host Programming Guide FCD LMAIM4019-00 FCD LMAIM4019-00 DDC-100 Direct-to-Host Programming Guide 1

1.3 Audience

These guidelines were written to help you successfully connect Limitorque valve actuators directly
to a control system Host computer. You do not have to be an expert in electronics or digital controls
to utilize this manual. However, this manual assumes that you have a working understanding of
valve actuators and a fundamental understanding of control system programming.

The following manuals should be available before attempting to connect the valve actuators to the
control system:

1) Accutronix Installation and Operation for MX-DDC Field Unit Manual

Bulletin LMAIM1329

2) DDC-100 UEC Field Unit (Modbus®) Installation and Operation Manual

Bulletin LMAIM4029

3) DDC-100 UEC Field Unit Wiring and Startup Guidelines

Bulletin LMAIM4022

4) DDC-100 UEC Field Unit Installation and Commissioning Manual

Bulletin LMAIM4030

5) Modicon Modbus Protocol Reference Guide PI-MODBUS-300 Rev. G

available from Modicon

6) Valve actuator installation manual for the specific model(s) to be installed.

An understanding of valve actuators and digital control systems is beneficial to all system users.
Flowserve assistance and training is available to help you operate your system at top efficiency. It
is recommended that you read this entire manual before attempting to install the valve actuators in
your control system.

Direct-to-Host Valve

2

In this document, Direct-to-Host valve control is defined as the use of a customer-supplied
(possibly pre-existing) Host control system (PLC, DCS, PC, etc.) to directly control the actuation of
valves that are equipped with DDC-100 Network-compatible field units. The field units are micro­processor-based devices that can communicate with the Host and respond to Host commands for
valve motion and status. The DDC-100 Network uses the EIA RS-485 standard for the physical layer
and the A.E.G. Modicon Modbus protocol for the command structure.

The Direct-to-Host solution to valve actuation systems provides distinct advantages for many
users. These benefits range from maximizing system design flexibility to utilizing existing plant
equipment for valve actuator control. The customer can emphasize selecting the best equipment
and software that closely matches the application’s requirements. This solution allows the user to
add valve control while avoiding the need to incorporate new control equipment into the facility.
Direct-to-Host functionality is accomplished through the use of open architecture control and
communications in the valve actuator controls that economically accommodate widely available
interfaces for existing SCADA, PLC, or personal computers.

Control

2.1 Advantages of Direct-to-Host Control

• Freedom to design a valve actuator system to interface directly with customer-preferred supervi­sory equipment with open-market availability and off-the-shelf components.

• Maximizes valve actuator system exibility by utilizing the industry standard protocol of Modbus,

complemented with the EIA RS-485 electrical standard.

• Increases control room equipment utilization while incorporating a cost savings to the customer

through the elimination of unnecessary hardware.

• Supports the use of control system components familiar to the user and eliminates the require­ment to learn third-party interfaces.

• Strengthens control system architecture with components readily available on the open market.

• Encourages parts replacement and support programs favorable to the user.

• Promotes direct downloading of valve actuator data to the supervisory control system without

intervening proprietary hardware or protocols.

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• Provides a safe and reliable communications path between the supervisory control system and

valve actuator network. This eliminates an unnecessary single point of failure that would exist if
the valve control network required a gateway device.

• Enhances the operational relationship between the customer and the customer’s preferred system

integrator.

2.2 Deliverables for Successful
Direct-to-Host Implementations

Each Direct-to-Host installation requires coordination to ensure that every supplier understands
their deliverable responsibilities. When suppliers understand particular obligations and perform
the tasks in an orderly and timely fashion, the DDC-100 Network installation process will progress
very smoothly. Appendix A outlines a “typical” chart detailing areas of responsibility or supplier
deliverables for installing a DDC-100 system. This appendix is a guideline and may vary from
project to project.

Field Unit

3

Monitoring and
Control

Flowserve Limitorque valve actuators that are DDC-100 Network compatible can be controlled and
monitored by sending queries and receiving responses over a serial data network. The DDC-100
Network uses the non-proprietary Modbus message protocol and EIA RS-485 standard for the
physical communication link.

Table 3.1 – Field Unit Communication Parameters

Parameter Options Default

Message Framing RTU, ASCII RTU

Baud Rate 1200, 2400, 4800, 9600, 19,200 9600

Data Bits 8 8

Stop Bits 1 1

Parity None None

Error Checking CRC-16 (RTU), LRC (ASCII) CRC-16 (RTU)

Field Unit Address Range 1–250 Configurable Configurable

3.1 Use of Coils and Registers
for Monitoring and Control

The material in this section is a brief tutorial and general discussion of the use of Modbus queries
and responses to control valve actuators. The detailed discussion of the commands will be given in
Section 3.2.

The Modbus communications protocol allows for working with two types of information—coils
(or bits) and registers (or 16-bit words). Coils are either ON (1) or OFF (0) and are used in direct
relation to relays (that have coils). For example, in a typical actuator, Coil 1 is energized to CLOSE
the actuator and Coil 2 is energized to OPEN the actuator. Register information is used for control
functions that do not involve coils. An example would be to write a command value to energize the
open or close coil or move the actuator to a position of 0 to 100% of open.

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Queries are used to send requests from the Modbus master (Host) to the Modbus slave (DDC-100
Field Unit), and the slave must respond with an appropriate response or an error message.

The Modbus function codes that are supported in the DDC-100 Network are a subset of the
complete Modbus function codes and are listed below:

01 Read Coil Status Reads the ON/OFF status of discrete outputs (coils) in the field units.

02 Read Input Status Reads the ON/OFF status of discrete inputs in the field units.

03 Read Holding Registers Reads the binary contents of holding registers in the field units.

04 Read Input Registers Reads the binary contents of the input registers in the field units.

05 Force Single Coil Forces a single coil to either the ON or OFF state.

06 Preset Single Register Presets a value into a single-holding register.

08 Diagnostics Provides communication tests and checks for internal error conditions in the

field units.

Table 3.2 – Modbus Function Codes Supported

Function

Code

Note: MX-DDC does not support Modbus function code 02.

Name

01 Read Coil Status Bit 0,000 - 9,999

02 Read Input Status 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

Modbus function codes 15 and 16 are supported in:
UEC-3-DDC Modbus Firmware 2.00 and greater
MX-DDC Firmware 02/01.00 and greater

Bit/Register
Addressing

Extended
Addressing Range

15 Force Multiple Coils Forces multiple coils to either the ON or OFF state.

16 Preset Multiple Registers Presets a value into multiple holding registers.

NOTE: All data in Modbus messages are referenced to zero. The first occurrence of a data item is
addressed as item number zero. This includes Coils, Inputs, and Registers. For example, coils 1-8
would be addressed as 0-7, inputs 1-16 would be addressed as 0-15, and registers 1-16 would be
addressed as 0-15.

3.2 Modbus

The Modbus protocol was developed by A.E.G. 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 communications. The slave devices (field
units in the actuators) respond to the queries from the master. Modbus only permits one master to
communicate at any given time (simultaneous communication is prohibited) for assuring process
control integrity.

The controlling device (master) must conform to the Modbus protocol as defined in the Modicon
Modbus Protocol Reference Guide PI-MODBUS-300 Rev. G 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 3.2.

The choice of which query to use in a particular situation can significantly affect the efficiency of the
network. As an example, consider the situation where the Host requires the status of the coils, the
status of the digital inputs, the status of the faults, and the status of the timers and analog chan­nels. This information can be obtained by using the 01 - Read Coil Status query, the 02 - Read Input
Status query, and 04 - Read Input Register query. To obtain this information, the Host would have
to send three separate queries, and the field unit would have to respond to each query separately.
A more efficient way to accomplish this same request for information would be through the use of
the 03 - Read Holding Register query. The Host would issue the 03 query (specifying the registers
to read), and the field unit would respond with one response that would contain all of the requested
information. The latter approach would generate considerably less network traffic than the former
approach, improving network capacity and response times.

In the strict sense, all transmissions from the Modbus master are called commands. In this manual,
a request for information, however, may be referred to as a query. Usually the term query will only
be used in conjunction with function codes (01), (02), (03), (04), and (08), which typically request
data. Commands are used in conjunction with function codes (05), (06), (15) and (16), which
typically initiate field unit action.

Examples

• The coil known as “coil 1” in the eld unit is addressed as coil 0000 in the data address eld of a

Modbus message.

• Digital input 129 decimal is addressed as digital input 0080 hex (128 decimal).

• Holding register 40001 is addressed as register 0000 in the data address eld of the message.

The function code field already specifies “holding register” operation. Therefore the reference
“4XXXX” is implicit.

• Holding register 40009 is addressed as register 0008 hex (8 decimal).

3.2.1 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 3.3. For the MX/DDC or UEC-3-DDC
Field Unit, 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.

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Table 3.3 – DDC-100 Coil Assignments, Modbus Function Code 01 Usage for Digital Outputs

Coil

Number

1 00 Close / Stop Close / Stop Close / Stop Do Not Use

2 01 Open / Stop Open / Stop Close / Stop Do Not Use

3 02 AS-1 Lockout or Relay #3 Lockout or Relay #3 Relay #3

4 03 AS-2 Do Not Use Relay #4 Relay #4

5 04 AS-3 Do Not Use Relay #5 Relay #5

6 05 AS-4 Relay #6 Relay #6 Relay #6

7 06 AR-1 (Opt) Do Not Use Do Not Use Relay #21

8 07 AR-2 (Opt) Do Not Use Do Not Use Relay #12

9 08 AR-3 (Opt) Do Not Use Do Not Use Do Not Use

Note 1: Relay #2 is physical Relay K2.

Note 2: Relay #1 is physical Relay K1.

Bit

Number

MX/DDC UEC-3-DDC DDC-100 Clamshell I/O Module

Example

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

Query 0301000000083C2E

Response 03010118503A

Message Breakdown

Query Response

03 Slave (Field Unit) Address 03

01 Function 01 Function

00 Starting Address Hi 01 Byte Count

00 Starting Address Lo 18 1 Data (Coils 8 - 1)

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.

Slave (Field Unit)
Address

3.2.2 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 3.4.

Table 3.4 – Status Bit Definitions

Bit Number

129 128 Opened Not Used

130 129 Closed Not Used

131 130 Stopped Not Used

132 131 Opening Not Used

133 132 Closing Not Used

134 133 Valve jammed Not Used

135 134 Actuator switched to local mode Not Used

136 135 Combined fault Not Used

Modbus

Bit

Address

UEC-3-DDC and DDC-100 Clamshell I/O Module

Table 3.4 – Status Bit Definitions (continued)

Bit Number

137 136 Over-temperature fault Not Used

138 137 Actuator failing to de-energize Not Used

139 138 Channel A fault Channel A fault

140 139 Channel B fault Channel B fault

141 140 Open torque switch fault Not Used

142 141 Close torque switch fault Not Used

143 142 Valve operated manually fault Not Used

144 143 Phase error Not Used

145 144

146 145

147 146

148 147

149 148

150 149

151 150

152 151

153 152

154 153

155 154

156 155 Local emergency shutdown is active Not Used

157 156

158 157 Wrong rotation Not Used

159 158 Opening in local mode Not Used

160 159 Closing in local mode Not Used

161 160 Close contactor (interlocked) Not Used

162 161 Open contactor (interlocked) Not Used

163 162 Lockout or user, Relay 3 Relay 3

164 163

165 164

166 165 User, Relay 6 Relay 6

167 166 Close contactor (non-interlocked) Relay 2 (K2)

168 167 Open contactor (non-interlocked) Relay 1 (K1)

169 168 Field unit software vs. ID Field unit software vs. ID

170 169 Field unit software vs. ID Field unit software vs. ID

171-176 170-175 Field unit software vs. ID Field unit software vs. ID

177 176 Remote switch User Input 8

178 177 Thermal overload User Input 9

Modbus

Bit

Address

UEC-3-DDC and DDC-100 Clamshell I/O Module

Input “open verify” is not active after open
command is initiated

Input “close verify” is not active after close
command is initiated

Input “open verify” is active after open
command is de-energized

Input “close verify” is active after close
command is de-energized

“Ph_det” (Phase Detect) input is active.
One or more phases is missing

“Ph_seq” (Phase Sequence) input is active.
Reverse phase sequence is occurring

Valve manually moved from mid-travel to
open

Valve manually moved from open to
mid-travel

Valve manually moved from mid-travel to
close

Valve manually moved from close to
mid-travel

Network emergency shutdown (ESD) is
active

Field unit microprocessor has reset since
the last poll

Local pushbutton switch LED (UEC-3)
Relay 4 (Clamshell)

Local pushbutton switch LED (UEC-3)
Relay 5 (Clamshell)

Not Used

Not Used

Not Used

Not Used

Not Used

Not Used

Not Used

Not Used

Not Used

Not Used

Not Used

Relay 4

Relay 5

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Table 3.4 – Status Bit Definitions (continued)

Bit Number

179 178 Open torque switch User Input 10

180 179 Open limit switch User Input 11

181 180 Close torque switch User Input 12

182 181 Close limit switch User Input 13

183 182 Aux. Open Input User Input 14

184 183 Aux. Close Input User Input 15

185 184 User Input 0 User Input 0

186 185 User Input 1 User Input 1

187 186 User Input 2 User Input 2

188 187 User Input 3 User Input 3

189 188 User Input 4 User Input 4

190 189 User Input 5 User Input 5

191 190 Input 6 User Input 6

192 191 Input 7 User Input 7

193 192 Analog Input 1 lost Analog Input 1 lost

194 193 Analog Input 2 lost Analog Input 2 lost

195 194 Analog Input 3 lost Analog Input 3 lost

196 195 Analog Input 4 lost Analog Input 4 lost

197 196 Network Channels A/B timed out Network Channels A/B timed out

198 197 Reserved Reserved

199 198 Reserved Reserved

200 199 Reserved Reserved

201 200 Reserved Reserved

202 201 Reserved Reserved

203 202 Reserved Reserved

204 203 Reserved Reserved

205 204 Lost Phase Input User Input 18

206 205 Phase Reverse Input User Input 19

207 206 Input 8 User Input 16

208 207 Input 9 User Input 17

Modbus

Bit

Address

UEC-3-DDC and DDC-100 Clamshell I/O Module

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

1

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).

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

Data (Inputs 10136 - 10129)

2

Data (Inputs 10144 - 10137)

3.2.3 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 3.5 for a complete listing of the holding registers.

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Table 3.5 – Field Unit Register Definitions

Register
Number

Register Name MX/DDC Meaning UEC-3-DDC Meaning

1 Command

2 Argument

3 Analog Output

4 Analog Output

5 Analog Input Main Power Value (Volts) Analog Input 4

6 Analog Input

7 Analog Input

8 Position

Status Register
(Field Units as

9

MOV - Motor­Operated Valve)

Status Register
I/O Module only

9

(Non-Valve
Service)

Registers 1 and 2 are write-only
registers used for Modbus Function
Code 06

Registers 1 and 2 are write-only
registers used for Modbus Function
Code 06

APT Scaled Output Value
(Default 0-100)

ATT Scaled Output Value1
(Default 0-100)

Analog Input 1 (Default 0-100) User
4-20 mA Input (Heavy Smoothing)

Analog Input 2 (Default 0-100) User
4-20 mA Input

Valve Position, Scaled Value (Default
0-100) (0-100, 2-255, 0-4095)2

16 Bits of Field Unit Status 16 Bits of Field Unit Status

Bit 0 Opened Bit 0 Opened

Bit 1 Closed Bit 1 Closed

Bit 2 Stopped Bit 2 Stopped

Bit 3 Opening Bit 3 Opening

Bit 4 Closing Bit 4 Closing

Bit 5 Valve jammed Bit 5 Valve jammed

Bit 6 Actuator switched to local

mode1

Bit 7 Combined fault3 Bit 7 Combined fault3

Bit 8 Over-temperature fault Bit 8 Over-temperature fault

Bit 9 Future Implementation

Bit 10 Network Channel A fault4 Bit 10 Network Channel A fault

Bit 11 Network Channel B fault4 Bit 11 Network Channel B fault

Bit 12 Open torque switch fault Bit 12 Open torque switch fault

Bit 13 Close torque switch fault Bit 13 Close torque switch fault

Bit 14 Valve-operated manually

fault

Bit 15 Phase error Bit 15 Phase error

N/A

Registers 1 and 2 are write-only
registers used for Modbus Function
Code 06

Registers 1 and 2 are write-only
registers used for Modbus Function
Code 06

N/A

Average Torque
(version 2.00 and greater)

Analog Input 3

Analog Input 2

Valve Position, Scaled Value (Default
0-100) OR Analog Input 1

Bit 6 Actuator switched to local

Bit 9 Actuator failing to de-ener-

Bit 14 Valve-operated manually

16 Bits of Field Unit Status

Bits 0-9 Not Used

Bit 10 Network Channel A fault

Bit 11 Network Channel B Fault

Bits 12-15 Not Used

mode

gize

fault

Table 3.5 – Field Unit Register Definitions (continued)

Register

Number

Register Name MX/DDC Meaning UEC-3-DDC Meaning

16 Bits of Field Status 16 Bits of Field Status

Bits 0-3 Not Used

Bit 4 One or more phases are

missing

Bit 5 Reverse phase sequence is

occurring

Bits 6-9 Not Used

Bit 10 Network emergency

shutdown is active

Bit 11 Local PB emergency

shutdown is active

Bit 12 MX microprocessor has

reset since the last poll

Bit 13 Local Stop

Bit 14 Opening in local mode

Bit 15 Closing in local mode

10

Fault Register
(Not Used for I/O
Module)

Bit 0 Input “open verify” is not

active after open command
is initiated

Bit 1 Input “close verify” is not

active after close command
is initiated

Bit 2 Input “open verify” is active

after open command is
de-energized

Bit 3 Input “close verify” is active

after close command is
de-energized

Bit 4 “Ph_det” input is active. One

or more phases are missing

Bit 5 “Ph_seq” input is active.

Reverse phase sequence is
occurring

Bit 6 Valve manually moved from

mid-travel to open

Bit 7 Valve manually moved from

open to mid-travel

Bit 8 Valve manually moved from

mid-travel to close

Bit 9 Valve manually moved from

close to mid-travel

Bit 10 Network emergency

shutdown is active

Bit 11 Local emergency shutdown

is active

Bit 12 Field Unit microprocessor

has reset since the last poll

Bit 13 Wrong rotation

Bit 14 Opening in local mode

Bit 15 Closing in local mode

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Table 3.5 – Field Unit Register Definitions (continued)

Register
Number

Register Name MX/DDC Meaning UEC-3-DDC Meaning

Value of 16 Digital Outputs Value of 16 Digital Outputs

Bit 0 Close contactor (interlocked)

Bit 1 Open contactor (interlocked)

Bit 2 AS-1 Bit 2 Lockout or User Relay 3

Bit 3 AS-2

11 Digital Outputs

12 Digital Inputs 1

Bit 4 AS-3

Bit 5 AS-4

Bit 6 AR-1 (Opt)

Bit 7 AR-2 (Opt)

Bit 8 AR-3 (Opt) Bits 8-15 Field Unit Software vs. ID

Bit 9 Network Relay

Bits 10-15 Not Used

Value of 16 Digital Inputs 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, terminal 21

Bit 9 User Input 1, terminal 10

Bit 10 User Input 2, terminal 9

Bit 11 User Input 3, terminal 6

Bit 12 User Input 4, terminal 7

Bit 13 User Input 5, terminal 5

Bit 14 Opt User Input 6,

terminal 23

Bit 15 Opt User Input 7,

terminal 24

Bit 0 Close contactor (interlocked),

I/O Module as MOV (Motor­Operated Valve)

Bit 1 Open contactor (interlocked),

I/O Module as MOV

Bit 3 UEC-3-DDC Local push-

button switch LED, Relay 4
Clamshell and I/O Module

Bit 4 UEC-3-DDC Local push-

button switch LED, Relay 5
Clamshell and I/O Module

Bit 5 Relay 6 Clamshell and I/O

Module

Bit 6 Relay 2 (K2), I/O Module

(non-interlocked)

Bit 7 Relay 1 (K1), I/O Module

(non-interlocked)

Bit 0 Remote Switch, I/O Module

Input 8

Bit 1 Thermal Overload, I/O

Module Input 9

Bit 2 Open Torque Switch, I/O

Module Input 10

Bit 3 Open Limit Switch, I/O

Module Input 11

Bit 4 Close Torque Switch, I/O

Module Input 12

Bit 5 Close Limit Switch, I/O

Module Input 13

Bit 6 Aux. Open Input, I/O Module

Input 14

Bit 7 Aux. Close Input, I/O Module

Input 15

Bit 8 User Input 0, I/O Module

Input 0

Bit 9 User Input 1, I/O Module

Input 1

Bit 10 User Input 2, I/O Module

Input 2

Bit 11 User Input 3, I/O Module

Input 3

Bit 12 User Input 4, I/O Module

Input 4

Bit 13 User Input 5, I/O Module

Input 5

Bit 14 Input 6, I/O Module Input 6

Bit 15 Input 7, I/O Module Input 7

Table 3.5 – Field Unit Register Definitions (continued)

Register

Number

Register Name MX/DDC Meaning UEC-3-DDC Meaning

Value of 16 Digital Inputs Value of 16 Digital Inputs

Bit 0 Not Used Bit 0 Analog Input 1 lost

Bit 1 Not Used Bit 1 Analog Input 2 lost

Bit 2 Analog input 1 lost Bit 2 Analog Input 3 lost

Bit 3 Analog input 2 lost Bit 3 Analog Input 4 lost

Bit 4 Network Channels A/B

timed out

Bit 5 Not Used Bit 5 Reserved

Bit 6 DDC board present Bit 6 Reserved

Bit 7 I/O option board present Bit 7 Reserved

13 Digital Inputs 2

Timers and

14

Analog Channels

Bit 8 Not Used Bit 8 Reserved

Bit 9 Not Used Bit 9 Reserved

Bit 10 Not Used Bit 10 Reserved

Bit 11 Not Used Bit 11 Reserved

Bit 12 Phase lost

Bit 13 Phase reverse

Bit 14 Opt User Input 8,

terminal 25

Bit 15 Not Used

Bit 15 Input 9, I/O Module Input 17

Bits 0-15 – Not Used

Bit 4 Network Channels A/B

timed out

Bit 12 Phase lost input, I/O Module

Input 18

Bit 13 Phase reverse input, I/O

Module Input 19

Bit 14 Input 8, I/O Module Input 16

Value of 16 Bits

Bit 0 Analog Channel 1 Low

Bit 1 Analog Channel 2 Low

Bit 2 Analog Channel 3 Low

Bit 3 Analog Channel 4 Low

Bit 4 Analog Channel 1 High

Bit 5 Analog Channel 2 High

Bit 6 Analog Channel 3 High

Bit 7 Analog Channel 4 High

Bit 8 Open reversal time-out

Bit 9 Close reversal time-out

Bit 10 Jammed valve time-out

Bit 11 Network Channel A time-out

Bit 12 Network Channel B time-out

Bit 13 User 1 time-out

Bit 14 User 2 time-out

Bit 15 User 3 time-out

14 DDC-100 Direct-to-Host Programming Guide FCD LMAIM4019-00 FCD LMAIM4019-00 DDC-100 Direct-to-Host Programming Guide 15