Legacy Uss General Drive Setup Requirements - Siemens SIMATIC S7-1200 System Manual

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Communication processor and Modbus TCP

13.7 Legacy USS communication (CM/CB 1241 only)

Legacy USS general drive setup requirements

Legacy 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_DRV

instruction for that drive.

● The baud rate in all the drives must match the BAUD input on the USS_PORT 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_DRV

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.

USS general drive connection and setup is the same for USS instructions (V4.1) and legacy

USS instructions (V4.0 and earlier). Refer to the Example: USS general drive connection and

setup (Page 1162) for further information.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK