Communicating With The Plc; Uss Communication - Siemens Sinamics V90 Operating Instructions Manual

Control functions

7.8 Communicating with the PLC

7.8 Communicating with the PLC
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.
7.8.1

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: 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] Fixed position setpoint
p2618[0...7] Speed of fixed position setpoint
p2572
p2573
264
STX LGE
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
IPos maximum acceleration
IPos maximum deceleration
ADR PKE
Parameter
r0020
r0021
r0026
r0027
r0031
r0032
r0034
r0807
r2521
r2556
IND PWE PWE
Description
Speed setpoint smoothed
Actual speed smoothed
DC link voltage smoothed
Absolute actual current smoothed
Actual torque smoothed
Active power actual value smoothed
Motor utilization thermal
Master control active
LR position actual value
LR position setpoint after setpoint
smoothing
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2019, A5E36037884-007
BCC