Siemens SIMATIC S7-1500 Manual page 12

Wiring
Note
Note that the 24 V DC supply voltage for this module must always be supplied by terminals
19/20 and 39/40. Use the supplied potential jumpers for this purpose.
①
②
L+
M
Figure 3-1
12
Relay 16x
Backplane bus interface
Power supply 24 V DC for relay contacts ERROR
Ground
Block diagram and terminal assignment
CHx
RUN
PWR
Digital output module DQ 16x230VAC/2A ST Relay (6ES7522-5HH00-0AB0)
Channel or channel status LED (green)
Status display LED (green)
Fault display LED (red)
Supply voltage POWER LED (green)
Manual, 03/2015, A5E34934019-AA