Communication processor and Modbus TCP
13.4 Universal serial interface (USS) communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1163
The two wires at the opposite end of the RS485 cable must be inserted into the MM4 drive
terminal blocks. To make the cable connection on a MM4 drive, remove the drive cover(s) to
access the terminal blocks. See the MM4 user manual for details about how to remove the
covers(s) of your specific drive.
The terminal block connections are labeled numerically. Using a PROFIBUS connector on
the S7
-
1200 side, connect the A terminal of the cable to the drive terminal 15 (for an MM420)
or terminal 30 (MM440). Connect the B
terminal of B (P) A (N) the cable connector to termi-
nal 14 (MM420) or terminal 29 (MM440).
-1200 is a terminating node in the network, or if the connection is point-to-point, it is
necessary to use terminals A1 and B1 (not A2 and B2) of the conne
ctor since they allow the
termination settings to be set (for example, with DP connector type 6ES7972-0BA40-0X40).
Replace drive covers properly before supplying power
Make sure the drive covers are replaced properly before supplying power to the unit.
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