Siemens SINAMICS S120 Equipment Manual page 359

8.13 K90/K91, Control Unit with CompactFlash card with/without performance enhancement
NOTICE
Interfaces -X1, -X2, and -X3 are wired internally within the cabinet and are not available for
customer connections.
If the customer terminal block is ever replaced, connectors -X1 and -X2 must not be mixed
up! Otherwise, "Safe Torque Off" and "Safe Stop 1" will malfunction.
Note
The customer terminal block is a standard component of the Motor Module (chassis format)
Cabinet Module. The digital inputs/outputs of the CU320 Control Unit on terminal blocks -X4
and -X5 can only be used with option K90/K91 (CU320 Control Unit).
Note
The two groups of digital inputs (DI0 to DI3 and DI4 to DI7) each have a common reference
potential (ground reference M1 or M2). To close the circuit when the internal 24 V supply is
used, the ground references M1 / M2 are connected to internal ground (M).
If power is supplied from an external source, the jumper between ground M1 and M or M2
and M must be removed in order to avoid potential looping. The external ground must then
be connected to terminals M1 or M2.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
Options
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