Siemens ET 200SP Manual page 110

Starting the output sequence
To start the output sequence using the software enable, you set the SW_ENABLE control bit
(Page 117). The STS_SW_ENABLE feedback bit indicates that the software enable in the
technology module is active.
You can additionally use the hardware enable via the respective digital input DIn.0. You can
configure an input delay for DIn.0.
Pulse diagram
The following figure shows an example of an output sequence for the forward direction when
DIn.0 is being used as a hardware enable.
Figure 4-10 Example of an output sequence (HW enable)
If you are using the hardware enable, it is combined with the software enable. When the
software enable is active, the output sequence starts at the first rising edge of the hardware
enable. If the hardware enable is set and remains set for the duration of the input delay, the
On delay is started and the STS_ENABLE feedback bit is set. As soon as the On delay has
elapsed, the pulse width modulated signal is output with the assigned duty cycle at the digital
output DQn.A/DQn.B. The duty cycle is the ratio of pulse duration to period duration.
If you are not using a hardware enable, the On delay starts at the rising edge of
SW_ENABLE. The hardware enable is not supported in isochronous mode. If you configure
the hardware enable in isochronous mode, this is interpreted by the module as a limit switch.
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB
Configuring/address space
4.6 PWM with DC motor motor
109