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14
4. OPERATIOn
The Modbus connection is lead through
a 9-pole sub-D bushing (X20). It provides
the data lines A and B as well as an electrically
isolated supply voltage (5 V, 80 mA).
4.1 SELECTInG ThE BUS ADDRESS
1, 2, 4, 8, 16, 32, 64, 128
A device address, which only exists once in the system, must be set in a
switched-off state between 1 to 247 at the bus module via the switch
S501.1 to S501.7.
4.2 SETTInG ThE TRAnSMISSIOn PARAMETERS
The settings which are required for communication assimilation can be
made via the DIP switch S502 (configuration switch). At the standard
setting all switches are open. The following table illustrates the function
of the switches. 0 represents an open switch and 1 a closed switch.
PIn ALLOCATIOn Of ThE
MODBUS SOCKET
1 = CLOSED
0 = OPEn
S 501
1 = CLOSED
0 = OPEn
S 502
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