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and the ABB softstarter PST equipped with
a modbus fiedbus plug.
Softstarter PST Modbus RTU communication.
2.).
Softstarters PST installation and commissioning manual SFC132003M0201, Jan 2005
Softstarter software version: Ver 03.
In this particular example following documents has been used:
Modbus RTU FBP FielBusPlug MRP21.05. the baud rate the slave is
19200.
1SFC132021M0201 10
. Set the softstarter address and field bus communication. Please always use the actual softstarter and FBP manuals. The baud rate mapped the slave address, e.g. Therefore the master and the slave will have the communication parameters:
1 start bit, stop bit, data bit, even parity, 19200 baud
Data exchange with the Modbus RTU master
Step1
Without receiving the configuration data the softstarter not responding the request
telegrams the Master (LED the FBP blinking).
The communication parameters are: Start bit, Data bits, the Parity will adapted the
master.00
For other versions software RED marked figures this example will change
Softstarter settings
1.04. FBP technical description 2CDC194001D0201.
This document describes application example between Modbus RTU
master PLC CPU, PC, etc.01 and Ver 03.
After the configuration the softstarter will regular Modbus slave (LED off) and will
respond the polling telegrams the master.
Send configuration data the softstarter (Number I/O number parameters, etc.Example for set up.
Change the default address 248 the softstarter with the keypad (Fieldb Addr)
and enable the fieldbus communication Fieldb Ctrl=Yes ).
Step 2
Now the master can send different Modbus telegrams order exchange data with the
Softstarter. Set the communication parameters
