Legend:
CHIP card Chipkarte interface
X1 Cascading inputs and outputs CI and CO,
Test pulse outputs T0 ... T3
X2 Semiconductor outputs O0 ... O3,
Auxiliary output OA0,
Supply connections
X3 Relay outputs O4 and O5
X4 RS232 interface / Ethernet interface
X5, X6 Inputs I0 ... I19
X7 Power supply
LEDs: PWR
RUN
DIAG
FAULT
I FAULT
O FAULT