Siemens SIMATIC ET 200SP - Configuration Examples with Potential Distributor Modules

Application planning
4.6 Configuration examples for potential groups
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
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4.6.2 Configuration examples with potential distributor modules
3-wire connection
The potential distributor modules allow for a space-saving design. For a 3-wire connection,
you can, for example, replace two digital input modules with 8 channels on a 141 mm long
BaseUnit with a digital input module with 16 channels and a potential distributor module,
each of which is only 117 mm long.
Note
You must not place a BaseUnit for I/O modules in a PotDis potential group formed with a
light
-colored PotDis-BaseUnit.
The figure below shows a configuration example with a DI 16×24VDC ST digital input
module on a BU15-P16+A0+2B BaseUnit and a PotDis-TerminalBlock PotDis-TB-P1-R on a
PotDis-BaseUnit PotDis-BU-P2/B-B.
Figure 4-7 Example: 3-wire connection