Emerson Digistart CS, Digistart IS User Manual
User Guide
Modbus
Digistart
0477-0009-01
www.controltechniques.com
English
General Information
The manufacturer accepts no liability for any consequences resulting from inappropriate, negligent or incorrect install ation or adj ustment
of the optional parameters of the equipment or from mismatching the starter with the motor.
The contents of this guide are believed to be correct at the time of printing. In the interests of commitment to a policy of continuous
development and improvement, the manufacturer reserves the right to change the specification of the product or its performance, or the
content of the guide without notice.
All rights reserved. No parts of this guide may be reproduced or transmitted in any form or by any means, electrical or mechanical
including, photocopying, recording or by an information storage or retrieval system, without perm issi on in writing f rom the publisher.
Copyright: © October 2009 Control Techniques Ltd
Issue: 1
Product Version 4
Contents
1. Introduction ....................................................................................................................................................... 4
2. Installation ......................................................................................................................................................... 4
3. Modbus Module Connection and Configuration ............................................................................................ 5
3.1 Adjustment ............................................................................................................................................................................. 5
3.2 Connection............................................................................................................................................................................. 5
3.3 Network Status LED ............................................................................................................................................................... 6
4. Master Configuration ........................................................................................................................................ 6
5. Modbus Functions ............................................................................................................................................ 6
5.1 Modbus register ..................................................................................................................................................................... 7
5.2 Trip codes .............................................................................................................................................................................. 8
5.3 Examples ............................................................................................................................................................................... 9
5.4 Modbus error codes ............................................................................................................................................................... 9
6. AP ASCII Protocol ........................................................................................................................................... 10
6.1 Commands .......................................................................................................................................................................... 10
6.2 Status retrieval ..................................................................................................................................................................... 11
6.3 Data retrieval ....................................................................................................................................................................... 11
6.4 Calculating the checksum (LRC) .......................................................................................................................................... 12
7. Modbus Control via Remote Keypad ............................................................................................................ 13
7.1 Grounding and shielding ...................................................................................................................................................... 13
7.2 Termination resistors............................................................................................................................................................ 13
7.3 RS485 data cable connection .............................................................................................................................................. 13
7.4 Remote Keypad RS485 network connection specifications .................................................................................................. 13
7.5 Using the Remote Keypad with Digistart CS ........................................................................................................................ 14
7.6 Programming ....................................................................................................................................................................... 14
7.7 Troubleshooting ................................................................................................................................................................... 15
8. Specifications .................................................................................................................................................. 16
Modbus Module User Guide 3
Issue 1 www.controltechniques.com
WARNING
08627.A
03550.A
1. Introduction
Control Techniques soft starters can be controlled and monitored across an RS485 serial communication network using the Modbus
RTU and AP ASCII protocols.
For users requiring simple control of Digistart CS and Digistart IS soft starters using Modbus RTU or AP ASCII, the instructions below
describe the installation and operation of the Modbus Module.
Digistart CS soft starters can also connect to the network via a correctly configured Remote Keypad - see Modbus Control via Remote
Keypad on page 13 for details.
2. Installation
Remove mains and control voltage from the soft starter before attaching or removing accessories.
Install the Modbus Module using the following procedure:
Figure 2-1 Attach the module to the starter
Digistart CS
Plug the module onto the side of the soft starter.
Digistart IS :
1. Line the module up with the comms port slot.
2. Press the top retaining clip of the module into the soft starter
chassis.
3. Press in the bottom retaining clip.
Figure 2-2 Remove the module from the starter
Remove the module using the following procedure:
1. Take the module off-line.
2. Remove control power and mains supply from the soft starter.
3. Disconnect all field wiring from the module.
4. Push a small flat-bladed screwdriver into the slots at the top and bottom of the module
and depress the retaining clips.
5. Pull the module away from the soft starter.
4 Modbus Module User Guide
www.controltechniques.com Issue 1
Protocol
Address
Baud Rate
Parity
Timeout
(seconds)
4800
OFF
OFF
9600
OFF
ON
19200
ON
38400
ON
ONOFF
No Parity
OFF
OFF
ODD
OFF
ON
EVENON10 bit
ON
ON
OFF
No Time Out
OFF
OFF
10 s
OFF
ON
60 sON100 s
ON
ONOFF
AP
ASCII
OFF
RTU
ON
Example: Address = 24
+16
+8
+4
+2
+1
0
0
0
0
0
ON
+16
+8
+4
+2
+1
0
0
0
0
0
ON
08649.A
1
2
3
08650.A
1
2
3
Modbus Module – RS485 serial port
DI2, +24V: Stop
NOTE
3. Modbus Module Connection and Configuration
3.1 Adjustment
Network communication parameters must be set on the Modbus Module. DIP switch settings take effect on the power-up of the Modbus
Module via the soft starter.
Figure 3-1 Adjustment switches
3.2 Connection
Figure 3-2 Modbus Module connec t io ns
Digistart CS Digistart IS
Digistart CS
RS485 connection onto Modbus network
For the Modbus Module to accept serial commands, a link must be fitted across terminals CSL-DI2 on Digistart CS starters.
Input links are required across terminals DI2, +24V and DI3, +24V if the Digistart IS soft starter is being operated in Remote mode. In
Local mode, links are not required.
Digistart IS Pr 3O Comms in Remote selects whether the soft starter will accept Start, Stop or Reset commands from the
Modbus Module User Guide 5
Issue 1 www.controltechniques.com
Serial Network Master while in Remote mode. See the Digistart IS User Manual for parameter details.
Digistart IS (Remote mode)
DI3, +24V: Reset
Modbus Module – RS485 serial port
RS485 connection onto Modbus network
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