Communication processor and Modbus TCP
13.4 Universal serial interface (USS) communication
S7-1200 Programmable controller
1162 System Manual, V4.2, 09/2016, A5E02486680-AK
USS general drive setup requirements
USS general drive setup requirements consist of the following points:
● The drives must be set to use 4 PKW words.
● The drives can be configured for 2, 4, 6, or 8 PZD words.
● The number of PZD word's in the drive must match PZD_LEN input on the
USS_Drive_Control instruction for that drive.
● The baud rate in all the drives must match the BAUD input on the USS_Port_Scan
instruction.
● The drive must be set for remote control.
● The drive must be set for frequency set-point to USS on COM Link.
● The drive address must be set to 1 to 16 and match the DRIVE input on the
USS_Drive_Control block for that drive.
● The drive direction control must be set to use the polarity of the drive set-point.
● The RS485 network must be terminated properly.
Example: USS general drive connection and setup
Connecting a MicroMaster drive
This information about SIEMENS MicroMaster drives is provided as an example. For other
drives, refer to the drive's manual for setup instructions.
To make the connection to a MicroMaster Series 4 (MM4) drive, insert the ends of the
RS485 cable into the two caged-clamp, screw-less terminals provided for USS operation.
Standard PROFIBUS cable and connectors can be used to connect the S7-1200.
Interconnecting equipment with different reference potentials can cause unwanted currents
to flow through the interconnecting cable
These unwanted currents can cause communications errors or damage equipment. Be sure
all equipment that you are about to connect with a communications cable either shares a
common circuit reference or is isolated to prevent unwanted current flows. The shield must
be tied to chassis ground or pin 1 on the 9-pin connector. It is recommended that you tie
wiring terminal 2-0 V on the MicroMaster drive to chassis ground.
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