4.4 Power supply
Power supply
The power supply is connected using a 3-pin plug-in terminal block. The functional ground can
be connected to the grounded DIN rail. It does not need to be connected for problem-free
operation. The power supply is non-oating.
Figure 4-4 Connecting the power supply
Figure 4-5 Pin assignment of the terminal block
Table 4-1 Pin assignment for the power supply
Pin number Assignment
Pin 1 L+ (24 V DC)
Pin 2 M (chassis ground)
Pin 3 Functional ground
Installation
4.4 Power supply
Compact Switch Module CSM 1277
Compact Operating Instructions, 06/2022, A2B00079397-02 29
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