Direction And Stop; Speed Limit; Communicating With The Plc; Uss Communication - Siemens SINAMICS V90 Operating Instructions Manual

Control functions

7.7 Communicating with the PLC

7.6.3

Direction and stop

Two digital input signals are used to control motor direction and run/stop:
● CWE: clockwise enable
● CCWE: counter-clockwise enable
The following table shows you in details:
CCWE
Note
In S mode or T mode, when the servo motor is ready to run, signal CWE or CCWE is a must
to start running the motor.
For more information about the signals CWE and CCWE, refer to "DIs (Page 70)".
7.6.4

Speed limit

Refer to "Speed limit (Page 150)" for details.
7.7 Communicating with the PLC
The SINAMICS V90 supports communication with the PLC on RS485 interface. You can
parameterize whether the RS485 interface shall apply USS or Modbus RTU protocol. USS is
the default bus setting. A shielded twisted pair cable is recommended for the RS485
communication.
7.7.1

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.
182
Signal Fixed torque setpoint
CWE
0 0
0 1
1 0
1 1
+ polarity
0
CW CW
CCW CCW
0
Operating Instructions, 07/2015, 6SL3298-0AV60-0BP0
Analog torque setpoint
- polarity
0 0
CCW
CW
0 0
SINAMICS V90, SIMOTICS S-1FL6
0 V
0
0
0
0