Auma Aumatic ac 01.2 User manual

Actuator controls

AUMATIC AC 01.2/ACExC 01.2

Modbus RTU

Device integration FieldbusManual

Read operation instructions first.

●Observe safety instructions.

Purpose of the document:

This document contains information for the commissioning staff of the distributed control system and DCS software

engineers.This document is intended to support the actuator integration into the DCS via fieldbus interface.

Reference documents:

●Operation instructions (Assembly, operation, commissioning) for actuator

●Manual (Operation and setting) AUMATIC AC 01.2 Modbus

Reference documents can be downloaded from the Internet (www.auma.com) or ordered directly from AUMA

(refer to <Addresses>).

Table of contents Page

41. Safety instructions................................................................................................................. 41.1. Basic information on safety 41.2. Range of application 51.3. Warnings and notes 51.4. References and symbols

62. General information about Modbus...................................................................................... 62.1. Basic characteristics 62.2. Modbus basic functions 62.3. Transfer mode 62.4. Bus access 62.5. Communication 72.6. Protective functions 72.7. Modbus RTU mode

83. Commissioning...................................................................................................................... 83.1. Introduction 83.1.1. Modbus function overview 83.1.1.1. Functions for data transmission 83.1.1.2. Diagnostic functions 93.1.2. Modbus function and pertaining offset addresses of the AUMATIC 93.1.3. Operation parameters of the actuator

104. Description of the data interface.......................................................................................... 104.1. Input data –signals 104.1.1. Reading input data from the actuator using register functions 124.1.2. Description of the input data 244.1.3. Reading the feedback signals from the actuator using status functions 284.2. Output data –operation commands 284.2.1. Transmitting or reading out operation commands from the actuator using register

functions 294.2.2. Description of the output data 344.2.3. Transmitting operation commands from the actuator using Coil functions 354.3. Redundancy 354.3.1. Redundant behaviour according to AUMA redundancy 374.3.2. Redundant behaviour using both a redundant loop and the SIMA master station

Actuator controls

Table of contents AC 01.2/ACExC 01.2 Modbus RTU

405. Description of Modbus board............................................................................................... 405.1. Indications (indication and diagnostic LEDs)

426. Corrective action.................................................................................................................... 426.1. Troubleshooting 426.2. Diagnostics

447. Technical data......................................................................................................................... 447.1. Modbus interface

468. Appendix................................................................................................................................. 468.1. Proposed wiring diagram for external sensors, 2-wire technology 478.2. Proposed wiring diagram for external sensors, 3-wire technology 488.3. Proposed wiring diagram for external sensors, 4-wire technology 498.4. Parameters

76Index........................................................................................................................................

77Addresses...............................................................................................................................

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU Table of contents

1. Safety instructions

1.1. Basic information on safety

Standards/directives AUMA products are designed and manufactured in compliance with recognised

standards and directives.This is certified in a Declaration of Incorporation and a EC

Declaration of Conformity.

The end user or the contractor must ensure that all legal requirements, directives,

guidelines, national regulations and recommendations with respect to assembly,

electrical connection, commissioning and operation are met at the place of installation.

They include among others applicable configuration guidelines for fieldbus

applications.

Safetyinstructions/warn-

ings All personnel working with this device must be familiar with the safety and warning

instructions in this manual and observe the instructions given. Safety instructions

and warning signs on the device must be observed to avoid personal injury or property

damage.

Qualification of staff Assembly, electrical connection, commissioning, operation, and maintenance must

be carried out exclusively by suitably qualified personnel having been authorised by

the end user or contractor of the plant only.

Prior to working on this product, the staff must have thoroughly read and understood

these instructions and, furthermore, know and observe officially recognised rules

regarding occupational health and safety.

Commissioning Prior to commissioning, it is important to check that all settings meet the requirements

of the application. Incorrect settings might present a danger to the application, e.g.

cause damage to the valve or the installation.The manufacturer will not be held

liable for any consequential damage. Such risk lies entirely with the user.

Operation Prerequisites for safe and smooth operation:

●Correct transport, proper storage, mounting and installation, as well as careful

commissioning.

●Only operate the device if it is in perfect condition while observing these instruc-

tions.

●Immediately report any faults and damage and allow for corrective measures.

●Observe recognised rules for occupational health and safety.

●Observe the national regulations.

●During operation,thehousing warms upandsurface temperatures>60°Cmay

occur.To prevent possible burns, we recommend to the check surface temper-

ature with an appropriate thermometer prior to working with device and to wear

protective gloves, if required.

Protective measures The end user or the contractor are responsible for implementing required protective

measures on site, such as enclosures, barriers, or personal protective equipment

for the staff.

Maintenance Any device modification requires the consent of the manufacturer.

1.2. Range of application

AUMA actuator controls are exclusively designed for the operation of AUMA actuators.

Other applications require explicit (written) confirmation by the manufacturer.The

following applications are not permitted, e.g.:

●motor control

●pump control

No liability can be assumed for inappropriate or unintended use.

Observance of these operation instructions is considered as part of the device's

designated use.

Actuator controls

Safety instructions AC 01.2/ACExC 01.2 Modbus RTU

1.3. Warnings and notes

The following warnings draw special attention to safety-relevant procedures in these

operation instructions, each marked by the appropriate signal word (DANGER,

WARNING, CAUTION, NOTICE).

Indicates an imminently hazardous situation with a high level of risk. Failure

to observe this warning could result in death or serious injury.

Indicates a potentially hazardous situation with a medium level of risk.Failure

to observe this warning could result in death or serious injury.

Indicates a potentially hazardous situation with a low level of risk. Failure to

observe this warning may result in minor or moderate injury.May also be used

with property damage.

Potentially hazardous situation. Failure to observe this warning may result in

property damage. Is not used for personal injury.

Arrangement and typographic structure of the warnings

Type of hazard and respective source!

Potential consequence(s) in case of non-observance (option)

→Measures to avoid the danger

→Further measure(s)

Safety alert symbol warns of a potential personal injury hazard.

The signal word (here: DANGER) indicates the level of hazard.

1.4. References and symbols

The following references and symbols are used in these instructions:

Information The term Information preceding the text indicates important notes and information.

Symbol for CLOSED (valve closed)

Symbol for OPEN (valve open)

Important information before the next step.This symbol indicates what is required

for the next step or what has to be prepared or observed.

Via the menu to parameter

Describes the path within the menu to the parameter. By using the push buttons of

the local controls you may quickly find the desired parameter in the display.

< > Reference to other sections

Terms in brackets shown above refer to other sections of the document which provide

further information on this topic.These terms are either listed in the index, a heading

or in the table of contents and may quickly be found.

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU Safety instructions

2. General information about Modbus

For exchange of information among automation systems and the connected

decentralised field devices, the use of serial fieldbus systems for communication is

state-of-the-art.Thousands of applications have proved impressively that, in

comparison with conventional technology, cost savings of up to 40 % in wiring,

commissioning, and maintenance are achieved by using fieldbus technology.While

in the past the fieldbus systems used were often manufacturer specific and

incompatible with other bus systems, those implemented today are almost exclusively

open and standardized.This means that the user does not depend on individual

suppliers and can choose within a large product range the most suitable product at

the most competitive price.

Modbus is an open fieldbus system used successfully throughout the world.The first

Modbus solution was initiated as early as 1979. Since then, Modbus has developed

into a de-facto standard. Meanwhile, Modbus has been standardised by the IEC

61158 and IEC 61784 standards.This standardization ensures that the investments

by manufacturers and users are protected to the best possible degree and the user

no longer depends on one manufacturer.The application range includes automation

in the areas of manufacturing, processing, and building.

2.1. Basic characteristics

Modbus defines the technical and functional features of a serial fieldbus system used

for interconnecting distributed digital automation devices. Modbus distinguishes

between master and slave devices.

Master devices Master devices control data traffic on the bus.A master is allowed to send messages

without an external request. Masters are also called "active devices" in the Modbus

protocol.

Slave device Slave devices such as AUMA Modbus actuators are peripheral devices.Typical

slave devices are input/output devices, valves, actuators, and measuring transducers.

They do not have bus access rights, i.e.they may only acknowledge received

messages or, at the request of a master, transmit messages to that master. Slaves

are also called ‘passive devices’.

2.2. Modbus basic functions

Modbus uses a master-slave technique where only the master can initiate a

transaction.The slaves respond by supplying the requested data in a response

message or by executing the action requested in the query.

The Modbus telegram from the master contains the slave address, a function code

defining the requested action, a data field, and a CRC field.The Modbus slaves’

response message contains fields confirming the requested action and possibly the

requested data as well as a CRC field.

If an error occurs during reception of the telegram or if the slave is unable to perform

the requested action, the slave will generate an error telegram and send it as response

to the master.

2.3. Transfer mode

●RS-485 twisted pair cable or fibre optic cable.

●AUMA actuators with controls AUMATIC AC 01.2/ACExC 01.2 support baud

rates up to 115.2 kbits/s.

2.4. Bus access

●Master-slave technique

●Mono-master system

●Master and slave devices: max.247 devices at one bus, without repeater max.

32 devices.

2.5. Communication

●Master-slave data exchange via request-response cycle (polling procedure).

Actuator controls

General information about Modbus AC 01.2/ACExC 01.2 Modbus RTU

●Modbus RTU protocol

2.6. Protective functions

●Parity check for each telegram byte

●CRC check for each telegram

●Watchdog for AUMA actuators with adjustable failure behaviour.

●Request-response cycle monitoring with configurable timer interval at the

master.

2.7. Modbus RTU mode

Data format for a byte

Coding system:

●8 bit binary, hexadecimal 0-9, A-F

●hexadecimal characters contained in each 8 bit field of the telegram

Bits per byte:

●1 start bit

●8 data bits; least significant bit sent first

●1 bit for even/odd parity, no bit for no parity

●1 stop bit if parity is used, 1 or 2 stop bits if no parity is used.

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU General information about Modbus

3. Commissioning

3.1. Introduction

To commission a Modbus slave, a special configuration of the master using a

configuration file is usually not required.

The Modbus RTU transmission is based on a simple protocol containing the slave

address, a function code with offset address, the process data, and a checksum.

3.1.1. Modbus function overview

3.1.1.1. Functions for data transmission

DescriptionFunction code

(decimal)

Function

Sets an individual bit in the slave to ON or OFF.05Force Single Coil Sets several consecutive bits in the slave to ON or OFF.15Force Multiple Coils Reads out the status of individual pieces of output bit information from the

slave.

01Read Coil Status

Reads out the status of individual pieces of input bit information from the slave.02Read Input Status Writes data to individual Holding Registers (16 bit) of the slave.06Preset Single Register Writes data into consecutive Holding Registers.16Preset Multiple Register Reads out the contents of the Input Data Registers (16 Bit) from the slave04Read Input Register Reads out the contents of the Holding Registers.03Read Holding Register

3.1.1.2. Diagnostic functions

DescriptionFunction code

(decimal)

Function

Reads diagnostic data.

●00 00 Loopback

●00 10 (0AHex) Clear Counters and Diagnostic Register

●00 11 (0BHex) Return Bus Message Count

●00 12 (0CHex) Return Bus Communication Error Count

●00 13 (0DHex) Return Bus Exception Error Count

●00 14 (0EHex) Return Slave Message Count

●00 15 (0FHex) Return Slave No Response Count

●00 16 (10Hex) Return Slave NAK Count

●00 17 (11Hex) Return Slave Busy Count

●00 18 (12Hex) Return Character Overrun Count

08Diagnostics

Reads the device-specific data from the slave.

●Byte 1: Slave Address

●Byte 2: 0x11 (Function Code)

●Byte 3: Byte Count = 97

●Byte 4: 0x01 (Ident Code)

●Byte 5: 0x00 = Not ready REMOTE, 0xFF = Ready REMOTE

●from byte 6 (vendor, 18 bytes): AUMA Riester GmbH

●from byte 24 (actuator controls order number, 18 bytes)

●from byte 42 (firmware version, 13-byte ASCII string)

●from byte 55 (device tag, 20-byte ASCII string)

●from byte 75 (actuator controls serial number, 13-byte ASCII string)

●from byte 88 (actuator controls serial number, 13-byte ASCII string)

17Report Slave ID

Actuator controls

Commissioning AC 01.2/ACExC 01.2 Modbus RTU

3.1.2. Modbus function and pertaining offset addresses of the AUMATIC

Permissible offset addresses

(hexadecimal)

Permissible offset addresses

(decimal)

Permissible function/func-

tion code

(decimal)

Action

0x0000 to 0x01FF0 to 511Force Single Coil (05)

Force Multiple Coils (15)

Read Coil Status (01)

Read or write process repres-

entation output data (master

outputs) 0x03E8 to 0x04071,000 to 1,031Preset Single Register (06)

Preset Multiple Register (16)

Read Holding Register (03) 0x0000 to 0x01FF0 to 511Read Input Status (02)Read process representation

input data (master inputs) 0x03E8 to 0x04071,000 to 1,031Read Input Register (04) 0x0408 to 0x04271,032 to 1,063Read Holding Register (03) 0x04B0 to 0x05DBView Objects:1,200 to 1,499

(refer to <Parameters>)

Individual parameter requests

from 2,000

Preset Multiple Register (16)

Read Holding Register (03)

Read or write AUMATIC para-

meters

3.1.3. Operation parameters of the actuator

Parameters and instructions for setting of the AUMATIC via Modbus RTU (Modbus

function codes, offset addresses, parameter descriptions as well as the read/write

access codes) are described in the appendix.

Functions to be used

AUMATIC parameters can be written or read using of the following functions:

●Preset Multiple Register (16)

●Read Holding Register (03).

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU Commissioning

4. Description of the data interface

4.1. Input data –signals

The master (controls) can read the state of the slave (actuator) by means of the input

data.

4.1.1. Reading input data from the actuator using register functions

Function to be used: Read Input Register (04)

When using the Read Holding Register (03) function, an additional offset of 32 has

to be addressed (1032 –1063 or 0x0408 –0x0472).

Grey bits are collective signals.They contain the results of a disjunction (OR

operation) of other information.

Byte 3: Actual position high byte (position transmitter)

Byte 4: Actual position low byte (position transmitter)

10010x03E9

10020x03EA

10030x03EB

Byte 9: Input AIN 1 (high byte)

Byte 10: Input AIN 1 (low byte)

10040x03EC

Byte 11 Torque (high byte)

Byte 12:Torque (low byte)

10050x03ED

Actuator controls

Description of the data interface AC 01.2/ACExC 01.2 Modbus RTU

10070x03EF

10080x03F0

10090x03F1

Byte 21: Input AIN 2 (high byte)

Byte 22: Input AIN 2 (low byte)

10100x03F2

10110x03F3

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU Description of the data interface

10130x03F5

10140x03F6

10150x03F7

Byte 33 to byte 40:Reserve1016 –10190x03F8 –0x03FB

4.1.2. Description of the input data

Byte 1: Logical signals

Bits 3, 6, and 7 are collective signals.

Bits 5 and 4 of the logical signals (byte1) indicate a logical operation of the actuator,

i.e.they are set when the actuator has received the command to perform an electrical

operation (also active when e.g.the actuator is in a stepping pause during stepping

mode or waiting for the end of the dead time).

Actuator controls

Description of the data interface AC 01.2/ACExC 01.2 Modbus RTU

Table 1: Byte 1: Logical signals

DescriptionValueDesignation

(process representation)

Bit

For limit seating: Limit switch operated in direction OPEN

For torque seating:Torque switch and limit switch operated in direction OPEN

Bit: End p. OPEN

No signal0 For limit seating: Limit switch operated in direction CLOSE

For torque seating:Torque switch and limit switch operated in direction CLOSE

Bit: End p. CLOSED

No signal0 The setpoint is within max. error variable (outer dead band).Is only signalled if

Modbus master has set the Fieldbus SETPOINT bit (process representation output).

Bit: Setpoint reached

No signal0 Collective signal 04:

Contains the result of a disjunction (OR-operation) of all bits comprised in bytes 13

and 14 (Not ready REMOTE 1 and Not ready REMOTE 2).

The actuator cannot be operated from REMOTE.

The actuator can only be operated via the local controls.

Bit: Not ready REMOTE

In bytes 13 and 14, no signals are active (all bits are set to 0).0 An operation command in direction OPEN is performed via fieldbus:Fieldbus OPEN

or Fieldbus SETPOINT (process representation output).This bit remains also set

during operation pauses (e.g.due to the dead time or the reversing prevention time).

Bit: Running OPEN

Operation in direction OPEN via fieldbus is not executed.0 An operation command in direction CLOSE is performed via fieldbus:Fieldbus CLOSE

or Fieldbus SETPOINT (process representation output).This bit remains also set

during operation pauses (e.g.due to the dead time or the reversing prevention time).

Bit: Running CLOSE

Operation in direction CLOSE via fieldbus is not executed.0 Collective signal 02:

Contains the result of a disjunction (OR-operation) of all bits of bytes 17 to 20

(Warning 1 to Warning 4).

Bit: Warnings

In bytes 17 and 20, no warnings are active (all bits are set to 0).0 Collective signal 03:

Contains the result of a disjunction (OR-operation) of all bits of bytes 15 and 16 (Fault

1 and Fault 2).

The actuator cannot be operated.

Bit: Fault

In bytes 15 and 16, no faults are active (all bits are set to 0).0

Byte 2: Actuator signals

Table 2: Byte 2: Actuator signals

DescriptionValueDesignation

(process representation)

Bit

Motor protection tripped1

Bit: Thermal fault

0No signal0

●When connecting to a 3-ph AC system and with internal 24 V DC supply of the

electronics: Phase 2 is missing.

●When connecting to a 3-ph or 1-ph AC system and with external 24 V DC supply

of the electronics: One of the phases L1, L2 or L3 is missing.

Bit: Phase failure

All phases are available.0 Selector switch is in position REMOTE.1

Bit: Sel. sw. REMOTE

2Selector switch is not in position REMOTE.0 Selector switch is in position LOCAL.1

Bit: Sel. sw. LOCAL

3Selector switch is not in position LOCAL.0 Limit switch operated in direction OPEN1

Bit: Limit sw. OPEN

4No signal0 Limit switch operated in direction CLOSE1

Bit: Limit sw. CLOSED

5No signal0

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU Description of the data interface

DescriptionValueDesignation

(process representation)

Bit

Torque switch operated in direction OPEN.1

Bit: Torque sw.OPEN

6No signal0 Torque switch operated in direction CLOSE.1

Bit: Torque sw.CLOSE

7No signal0

Bytes 3 and 4: Actual position

Byte 3 = high byte, byte 4 = low byte.

If a position transmitter (potentiometer, RWG, EWG, or MWG) is installed in the

actuator, bytes 3 and 4 are used to transmit the current actuator position.The value

is transmitted in per mil (value: 0 –1,000).

Byte 5: Device status

Table 3: Byte 5: Device status

DescriptionValueDesignation

(process representation)

Bit

Collective signal 04:

Contains the result of a disjunction (OR-operation) of all bits comprised in bytes 13

and 14 (Not ready REMOTE 1 and Not ready REMOTE 2).

The actuator cannot be operated from REMOTE.

The actuator can only be operated via the local controls.

Bit: Not ready REMOTE

In bytes 13 and 14, no signals are active (all bits are set to 0).0 Collective signal 02:

Contains the result of a disjunction (OR-operation) of all bits of bytes 17 to 20

(Warning 1 to Warning 4).

Bit: Warnings

In bytes 17 and 20, no warnings are active (all bits are set to 0).0 Collective signal 03:

Contains the result of a disjunction (OR-operation) of all bits of bytes 15 and 16 (Fault

1 and Fault 2).

The actuator cannot be operated.

Bit: Fault

In bytes 15 and 16, no faults are active (all bits are set to 0).0 Collective signal 09:

Indication according to NAMUR recommendation NE 107

Recommendation to perform maintenance.

Contains the result of a disjunction (OR-operation) of all bits of byte 24 (Maintenance

required).

Bit: Maintenance requ.

In all bits of byte 24, no signals are active (all bits are set to 0).0 Collective signal 07:

Indication according to NAMUR recommendation NE 107

Actuator is operated outside the normal operation conditions.

Contains the result of a disjunction (OR-operation) of all bits of bytes 25 to 28 (Out

of specification 1 to 4).

Bit: Out of spec.

In bytes 25 and 28, no signals are active (all bits are set to 0).0 Collective signal 08:

Indication according to NAMUR recommendation NE 107

The actuator is being worked on; output signals are temporarily invalid.

Contains the result of a disjunction (OR-operation) of all bits of bytes 29 and 30

(Function check 1 and 2).

Bit: Function check

In bytes 29 and 30, no signals are active (all bits are set to 0).0 Collective signal 10:

Indication according to NAMUR recommendation NE 107

Actuator function failure, output signals are invalid.

Contains the result of a disjunction (OR-operation) of all bits of byte 23 (Failure).

Bit: Failure

In all bits of byte 23, no signals are active (all bits are set to 0).0 Collective signal 05:

The device is ready for remote control.

No AUMA warnings, AUMA faults or signals according to NAMUR are present.

Bit 7 is set if bits 0 to 6 are deleted.

Bit: Device ok

Contains the result of a disjunction (OR-operation) of bits 0 to 6 (device status).0

Actuator controls

Description of the data interface AC 01.2/ACExC 01.2 Modbus RTU

Byte 6: Operation status

This byte stores information about actuator movement.

Table 4: Byte 6: Operation status

DescriptionValueDesignation

(process representation)

Bit

The actuator is in off-time (e.g.reversing prevention time).1

Bit: Op. pause active

0No signal0 The actuator is in an intermediate position e.g. neither in end position OPEN nor in

end position CLOSED.

Bit: In interm. position

No signal0 The actuator is within the set stepping range.1

Bit: Start step mode

2The actuator is outside the set stepping range.0 No signal (reserved)—3Actuator is running (output drive is moving)

Hard wired collective signal consisting of signals:

●(26) Bit: Running LOCAL

●(27) Bit: Running REMOTE

●(28) Bit: Handwheel oper.

Bit: Actuator running

No signal0 Output drive rotates without electric operation command.1

Bit: Handwheel oper.

5No signal0 Output drive rotates due to operation command from REMOTE.1

Bit: Running REMOTE

6No signal0 Output drive rotates due to operation command from LOCAL.1

Bit: Running LOCAL

7No signal0

Byte 7: Intermediate positions

Table 5: Byte 7: Intermediate positions

DescriptionValueDesignation

(process representation)

Bit

Intermediate position 1 reached1

Bit: Interm. pos. 1

0No signal0 Intermediate position 2 reached1

Bit: Interm. pos. 2

1No signal0 Intermediate position 3 reached1

Bit: Interm. pos. 3

2No signal0 Intermediate position 4 reached1

Bit: Interm. pos. 4

3No signal0 Intermediate position 5 reached1

Bit: Interm. pos. 5

4No signal0 Intermediate position 6 reached1

Bit: Interm. pos. 6

5No signal0 Intermediate position 7 reached1

Bit: Interm. pos. 7

6No signal0 Intermediate position 8 reached1

Bit: Interm. pos. 8

7No signal0

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU Description of the data interface

Byte 8: Discrete inputs

Table 6: Byte 8: Discrete inputs

DescriptionValueDesignation

(process representation)

Bit

A high signal (+24 V DC) is present at digital input 1.1

Bit: Input DIN 1

0No signal0 A high signal (+24 V DC) is present at digital input 2.1

Bit: Input DIN 2

1No signal0 A high signal (+24 V DC) is present at digital input 3.1

Bit: Input DIN 3

2No signal0 A high signal (+24 V DC) is present at digital input 4.1

Bit: Input DIN 4

3No signal0 A high signal (+24 V DC) is present at digital input 5.1

Bit: Input DIN 5

4No signal0 A high signal (+24 V DC) is present at digital input 6.1

Bit: Input DIN 6

5No signal0 No signal (reserved)—6No signal (reserved)—7

Bytes 9 and 10: Input AIN 1

Byte 9 = high byte, byte 10 = low byte.

Byte 9 and byte 10 transmit the value of the first additional free analogue current

input of the Modbus interface.The start and end values can be set at the AC via

push buttons and display. (For operation, please refer to the respective operation

instructions for the actuator.)

If the measuring values are 0.3 mA below the initial value, a signal loss is indicated.

The value is transmitted in per mil (value: 0 –1,000).

Bytes 11 and 12:Torque

Byte 11 = high byte, byte 12 = low byte.

Bytes 11 and 12 transmit the current torque of the actuator (only if an MWG is installed

in the actuator).

The value transmitted is the current torque in percent or per mil of the nominal actuator

torque.

The value is transmitted in per mil (value: 0 –1,000).

●The value 1,000 corresponds to 127,0 % torque in direction OPEN.

●The value 500 is the torque zero point.

●The value 0 corresponds to 127,0 % torque in direction CLOSE.

Byte 13: Not ready REMOTE 1

Table 7: Byte 13: Not ready REMOTE 1

DescriptionValueDesignation

(process representation)

Bit

Wrong operation command

Indicates that several operation commands were received simultaneously via Modbus

(e.g.RemoteOPEN and Remote CLOSE simultaneouslyorRemoteCLOSE/Remote

OPEN and Remote SETPOINT simultaneously) or that the max.value for a setpoint

position has been exceeded (setpoint position > 1,000).

Bit: Wrong oper. cmd

Operation commands are ok.0 Selector switch is in position Local control (LOCAL) or 0(OFF).1

Bit: Sel. sw. not REMOTE

1Selector switch is in position Remote control (REMOTE).0

Actuator controls

Description of the data interface AC 01.2/ACExC 01.2 Modbus RTU

DescriptionValueDesignation

(process representation)

Bit

Actuator is interlocked.1

Bit: Interlock active

2No signal0 Push button STOP of local controls is operated.1

Bit: Local STOP

3No signal0 Operation mode EMERGENCY stop is active (EMERGENCY stop button has been

pressed).

Bit: EMCY stop active

EMERGENCY stop button not pressed (normal operation).0 Operation mode EMERGENCY behaviour is active (EMERGENCY signal was sent).1

Bit: EMCY behav. act.

5No signal0 No valid communication via fieldbus (despite available connection)1

Bit: FailState fieldbus

6Communication via fieldbus is ok.0 The actuator is controlled via the I/O interface (parallel).1

Bit: I/O interface

7The actuator is controlled via fieldbus.0

Byte 14: Not ready REMOTE 2

Table 8: Byte 14: Not ready REMOTE 2

DescriptionValueDesignation

(process representation)

Bit

No signal (reserved)—0No signal (reserved)—1The safety function of the SIL sub-assembly is active.1

Bit: SIL function active 1)

2No signal.0 Actuator is in operation mode Disabled..1

Bit: Disabled

3No signal0 By-pass of Interlock function is active.1

Bit: Interlock by-pass

4No signal0 Partial Valve Stroke Test (PVST) is active.1

Bit: PVST active

5No signal0 Operation mode Service is active.1

Bit: Service active

6No signal0 Manual operation is active (handwheel is engaged); optional indication1

Bit: Handwheel active

7No signal0

The safety function indications via fieldbus are for information only and must not be used as part of a safety function.The I/O signals of

the SIL module must be used for this purpose.

Byte 15: Fault 1

The fault signals contain the causes why the actuator cannot be operated.

Table 9: Byte 15: Fault 1

DescriptionValueDesignation

(process representation)

Bit

Incorrect configuration, i.e.the current setting of the actuator controls is invalid.1

Bit: Configuration error

0Configuration is ok.0 Due to insufficient mains quality, the controls cannot detect the phase sequence

(sequence of phase conductors L1, L2 and L3) within the pre-set time frame provided

for monitoring.

Bit: Mains quality

No signal0 Motor protection tripped1

Bit: Thermal fault

2No signal0

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU Description of the data interface

DescriptionValueDesignation

(process representation)

Bit

●When connecting to a 3-ph AC system and with internal 24 V DC supply of the

electronics: Phase 2 is missing.

●When connecting to a 3-ph or 1-ph AC system and with external 24 V DC supply

of the electronics: One of the phases L1, L2 or L3 is missing.

Bit: Phase failure

No signal0 Torque fault in direction OPEN1

Bit: Torque fault OPEN

4No signal0 Torque fault in direction CLOSE1

Bit: Torque fault CLOSE

5No signal0 Collective signal 14:Internal fault1

Bit: Internal error

6No internal fault0 No actuator reaction to operation commands within the set reaction time.1

Bit: No reaction

7No signal0

Byte 16: Fault 2

The fault signals contain the causes why the actuator cannot be operated.

Table 10: Byte 16: Fault 2

DescriptionValueDesignation

(process representation)

Bit

No signal (reserved)—0No signal (reserved)—1No signal (reserved)—2No signal (reserved)—3No signal (reserved)—4No signal (reserved)—5Configuration error of REMOTE interface active.1

Bit: Config. error REMOTE

6No signal.0 The phase conductors L1, L2 and L3 are connected in the wrong sequence.1

Bit: Incorrect phase seq

7Phase sequence is ok.0

Byte 17:Warnings 1

The warning signals are for information only and do not interrupt or disable an

operation (as opposed to faults).

Table 11: Byte 17:Warnings 1

DescriptionValueDesignation

(process representation)

Bit

No signal (reserved)—0No signal (reserved)—1No signal (reserved)—2No signal (reserved)—3Warning: Limit value for torque warning in direction CLOSE exceeded.1

Bit: Torque warn. CLOSE

4No signal0 Warning: Limit value for torque warning in direction OPEN exceeded.1

Bit: Torque warn. OPEN

5No signal0 Warning: A SIL fault of the SIL sub-assembly has occurred.1

Bit: SIL fault 1)

6No signal0 Warning: No actuator reaction to operation commands within the set reaction time.1

Bit: No reaction

7No signal0

Actuator controls

Description of the data interface AC 01.2/ACExC 01.2 Modbus RTU

The safety function indications via fieldbus are for information only and must not be used as part of a safety function.The I/O signals of

the SIL module must be used for this purpose.

Byte 18:Warnings 2

Table 12: Byte 18:Warnings 2

DescriptionValueDesignation

(process representation)

Bit

Warning:Temperature within controls housing too high1

Bit: Wrn controls temp

0No signal0 No signal (reserved)—1No signal (reserved)—2The external 24 V AC voltage supply of the controls has exceeded the power supply

limits.

Bit: 24 V DC, external

No signal0 No signal (reserved)—4Warning:The voltage of the RTC button cell is too low.1

Bit: RTC button cell

5No signal0 The real time clock has not yet been set on the basis of valid values.1

Bit: RTC not set

6No signal0 Warning: Configuration setting is incorrect.

The device can still be operated with restrictions.

Bit: Config. warning

No signal0

Byte 19:Warnings 3

Table 13: Byte 19:Warnings 3

DescriptionValueDesignation

(process representation)

Bit

Warning: FO cable system reserve reached (critical or permissible Rx receive level)1

Bit: Wrn FOC budget

0No signal0 Warning:

Optical receiving signal (channel 1) incorrect (no or insufficient Rx receive level) or

RS-485 format error (incorrect bit(s))

Bit: Wrn FO cables

No signal0 Warning: Loss of signal analogue input 21

Bit: Wrn input AIN 2

2No signal0 Warning: Loss of signal analogue input 11

Bit: Wrn input AIN 1

3No signal0 Collective signal 15:Internal warning1

Bit: Internal warning

4No internal warning0 Warning: Max. number of motor starts (starts) exceeded1

Bit: WrnOnTiStarts

5No signal0 Warning: Max. running time/h exceeded1

Bit: WrnOnTiRunning

6No signal0 Warning:Max.permissible operating time for an operation (OPEN-CLOSE) exceeded1

Bit: Op. time warning

7No signal0

Actuator controls

AC 01.2/ACExC 01.2 Modbus RTU Description of the data interface

Byte 20:Warnings 4

Table 14: Byte 20:Warnings 4

DescriptionValueDesignation

(process representation)

Bit

No signal (reserved)—0No signal (reserved)—1Warning: Loss of signal of actuator setpoint position1

Bit: WrnSetpointPos

2No signal0 Warning: A Partial Valve Stroke Test (PVST) should be performed.1

Bit: PVST required

3No signal0 Warning: FO cable connection not available.1

Bit: Wrn FOC connection

4No signal0 The failure behaviour is active.1

Bit: Failure behav. act.

5No signal0 Partial Valve Stroke Test (PVST) was aborted or could not be started. Remedy:

Perform RESET or restart PVST.

Bit: PVST abort

No signal0 Partial Valve Stroke Test (PVST) could not be successfully completed.1

Bit: PVST error

7No signal0

Bytes 21 and 22: Input AIN 2

Byte 21 = high byte, byte 22 = low byte.

Byte 9 and 10 transmit the value of the second additional free analogue current input

of the Modbus interface.The start and end values can be set at the AC via push

buttons and display. (For operation, please refer to the respective operation

instructions for the actuator.)

If the measuring values are 0.3 mA below the initial value, a signal loss is indicated.

The value is transmitted in per mil (value: 0 –1,000).

Byte 23: Failure

Causes of the Failure signal in accordance with NAMUR recommendation NE 107.

Table 15: Byte 23: Failure

DescriptionValueDesignation

(process representation)

Bit

No signal (reserved)—0No signal (reserved)—1No signal (reserved)—2No signal (reserved)—3No signal (reserved)—4No signal (reserved)—5No signal (reserved)—6Collective signal 03: