Siemens Simatic S7-1500 Manual page 82

Wiring
4.3 Terminal and block diagrams
Block diagram and terminal assignment X11
The figure below shows you how to connect the digital on-board I/O X11 and the assignment
of the channels to the addresses (input byte a and b, output byte c and d).
①
Encoder supply for the digital inputs
②
CPU interface
xL+ Connection for 24 V DC supply voltage
xM Connection for ground
CHx Channel or channel status LED (green)
RUN Status display LED (green)
ERROR Error display LED (red)
PWR POWER supply voltage LED (green)
Figure 4-11 Block diagram and terminal assignment of the digital on-board I/O X11
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CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB