Siemens SIMATIC ET 200SP Manual page 16

Parameters
4.3 Explanation of the module/channel parameters
Substitute value
The substitute value is output by the module at CPU STOP if you set the "Reaction to CPU
STOP" parameter to "Substitute value".
Potential group
A potential group consists of a group of directly adjacent I/O modules within an ET 200SP
station HA, which are supplied via a common supply voltage.
A potential group begins with a light terminal block, via which the required supply voltage is
fed to all I/O modules of the potential group. The light-colored terminal block interrupts the self-
assembling voltage buses to the left neighbor
All other I/O modules of this potential group are plugged into dark terminal blocks. I/O modules
on dark terminal blocks take the potentials of self-assembling voltage rails from the left
neighbor.
A potential group ends with the dark terminal block, which follows a light terminal block or a
server module in the station configuration.
You can find additional information on the configuration of the potential group in the system
manual
16
SIMATIC; Distributed I/O System; ET 200SP HA .
Digital output module DQ 16x24VDC/0.5A (6DL1132-6BH00-0PH1)
Manual, 05/2017, A5E39265993-AA