Siemens SIMATIC ET 200SP Manual page 30

Modes and Functions
3.3 Pulse width modulation (PWM) mode
● Example 2: The period duration 3333 μs is less than the application cycle time 10 ms
(10000 μs).
● Example 3: The period duration 30000 μs is greater than the application cycle time 10 ms
(10000 μs)
Note
Isochronous PWM operation
On-delay is not used by the module (always considered as zero) and the parameter
"Function DI" is always "Input". Only the software-enable SW_ENABLE 0 → 1 is used to start
the output sequence.
30
Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA