Siemens SIMATIC S7-1500 Manual page 43

Procedure
To enable the pulse output, follow these steps:
1. Set the Control_by_PLC, Enable_Setpoint and Enable_Ramp_Generator control bits to
TRUE and the On_OFF1, No_Coast_Stop_OFF2, No_Quick_Stop_OFF3 and
Enable_Operation bits to FALSE.
State S1 is reached: Switching on of the pulse output is still inhibited. The feedback bit
Switching_On_Inhibited is set to TRUE.
2. Set the On_OFF1 and No_Quick_Stop_OFF3 control bits to TRUE.
State S2 is reached: The pulse output is ready to switch on. The feedback bit
Ready_To_Switch_On is set to TRUE. The feedback bit Switching_On_Inhibited is set to
FALSE.
3. Set the On_OFF1 control bit to TRUE.
State S3 is reached: The pulse output is ready to switch on. The feedback bit
Ready_To_Operate is set to TRUE.
4. Set the Enable_Operation control bit to TRUE.
5. If you have configured a drive enable output, set it to high level.
The drive is enabled.
6. If you have configured a ready input, wait for the ready signal of the drive.
As soon as the ready input is at high level, state S4 is reached: Operation is enabled. The
pulse output starts. The feedback bit Operation_Enabled is set to TRUE.
Technology Module TM PTO 4 (6ES7553-1AA00-0AB0)
Manual, 12/2016, A5E38896703-AA
Configuring/address space
4.5 Control and feedback interface
43