Siemens SINAMICS S120 Combi Equipment Manual page 190

Additional system components
9.1 Terminal Module TM54F
LED Color
Single digital inputs, not fail-safe
DI x –
Green
Fail-safe digital outputs with associated readback channel
F_DO y Green
(0+..3+,
0-..3-)
Readback input DI 2y for output F_DO y (y = 0..3) at test stop.
The status of the LEDs also depends on the type of external circuit.
DI 2y –
Green
Cause and rectification of faults
The following reference contains information about the cause of faults and how they can be
rectified:
SINAMICS S120 Combi List Manual
190
Status
Off No signal at digital input x (x = 20..23)
Continuous Signal at digital input x
light
Continuous Output y (y=0 .. 3) carries a signal
light
Off One of the two output lines y+ or y- or both lines of output y
carry a signal
Continuous Both output lines y+ and y- carry no signal
light
Description, cause
Manual, Edition 05.2010, 6SL3097-4AV00-0BP0
Remedy
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SINAMICS S120 Combi