Communicating With The Plc (V90 Pti Only); Uss Communication - Siemens SINAMICS V90 Operating Manual

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4.6

Communicating with the PLC (V90 PTI only)

The SINAMICS V90 supports communication with the PLC on the RS485 interface. You can
parameterize whether the RS485 interface applies USS or Modbus RTU protocol. USS is the
default bus setting. A shielded twisted pair cable is recommended for RS485 communication.
4.6.1

USS communication

The SINAMICS V90 can communicate with the PLC through an RS485 cable with the
standard USS communication protocol. After the communication is established, you can
change the position setpoint and speed setpoint through the USS communication protocol.
The servo drive can also transmit the actual speed, torque, and alarm to the PLC through the
USS communication protocol.
Telegram format
The telegram format is shown as follows:
STX LGE
STX: start of text
LGE: length
ADR: slave address
PKE: parameter ID
IND: sub-index
PWE: parameter value
BCC: block check character
Relevant parameters
You can access the following parameters by USS.
Parameter
p1001
p1002
p1003
p1004
p1005
p1006
p1007
p2617[0...7]
p2618[0...7]
p2572
p2573
132
ADR PKE
Description
Fixed speed setpoint 1
Fixed speed setpoint 2
Fixed speed setpoint 3
Fixed speed setpoint 4
Fixed speed setpoint 5
Fixed speed setpoint 6
Fixed speed setpoint 7
Fixed position setpoint
Speed of fixed position setpoint
IPos maximum acceleration
IPos maximum deceleration
IND PWE
Parameter Description
r0020 Speed setpoint smoothed
r0021 Actual speed smoothed
r0026 DC link voltage smoothed
r0027 Absolute actual current smoothed
r0031 Actual torque smoothed
r0032 Active power actual value smoothed
r0034 Motor utilization thermal
r0807 Master control active
r2521 LR position actual value
r2556 LR position setpoint after setpoint
smoothing
SINAMICS V-ASSISTANT Online Help
Operating Manual, 04/2017, A5E36618042-003
PWE BCC