Siemens SIMATIC ET 200SP Manual page 54

Substitute value duty cycle
You use the "Substitute value duty cycle" parameter (0 ... 1000) to specify the pulse duty
cycle of the pulse width modulation in the case of a CPU STOP. See section Pulse width
modulation (Page 46).
Pulse width modulation time period
Specifies the frequency of the pulse width modulation.
See section Normal operation/Valve control (Page 21) and section Pulse width modulation
(Page 46).
Potential group
With the "Potential group" parameter, you specify whether the module is plugged into a light
or dark BaseUnit.
A potential group always begins with an I/O module that is plugged into a light BaseUnit. All
modules inserted to the right of this that are plugged into dark BaseUnits belong to the same
potential group, because the dark BaseUnits are supplied via the light BaseUnits.
The potential group ends at a new light BaseUnit or the end of the station.
Derating
Read the information on derating of the module in section Derating of the DQ 4x24VDC/2A
HS (Page 95).
See also
Distributed I/O System ET 200SP
(https://support.industry.siemens.com/cs/ww/en/view/58649293)
Digital output module DQ 4x24VDC/2A HS (6ES7132-6BD20-0DA0)
Manual, 06/2018, A5E32855695-AC
Pulse width modulation operating mode
5.2 Parameters/address space
53