Siemens SIMATIC ET 200SP HA System Manual page 40

Plant planning
4.7 Configurations of the slots of I/O modules
Note
● The L+ terminals on the potential distributor are intended exclusively for the sensors
connected to the I/O module using a 2-wire connection system.
● You may not use these terminals as voltage source for other devices in the system.
Recommendation: Use terminal blocks with potential distributors
The following terminal block should be used to connect sensors with two wires:
Article No.
6DL1193-6TP00-0DP0
6DL1193-6TP00-0BP0
Make sure that this parameter is enabled in HW Config starting with the commissioning.
1)
Table 4-8
Advantage with terminal block with potential dis‐
tributor
The L+ terminals on the potential distributor are
connected individually using automatic circuit
breakers to a maximum of 20 mA.
In the event of a short-circuit or overload, "only" the
affected channel fails.
40
Function/parameter
Allow new potential group (light terminal block)
Use potential group of the left module (dark terminal block)
Benefits of potential distributors compared to using external power supply units
1)
Disadvantage without potential distributor
No separate protection
Short circuit or overload affects the entire system.
ET 200SP HA Distributed I/O system
System Manual, 08/2019, A5E39261167-AD