Siemens ET 200pro Operating Instructions Manual page 237

Note
LEDs
The following applies to the digital electronic module 4 DI / 4 DO DC 24V/0.5A:
The inputs DI
displayed with the LEDs 4 to 7.
Status and error LEDs of analog electronic modules with CM IO 4 x M12 connection module
Table 9- 12
LEDs
GE
On
On
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
9.3 LED display on the power, electronic and pneumatic interface modules
to DI are displayed with the LEDs 0 to 3 and the outputs DQ
0 3
Status and error displays of analog electronic modules with CM IO 4 x M12 connection
module
Meaning
Status and error
displays
--- Incoming diagnostic alarm
No parameters or faulty parameters Check the parameter settings.
Short-circuit at the encoder supply
1L+
Channel fault occurred
On (red LED) Channel fault at the input/output of
channel X1, X2, X3 or X4
Alarm, error and system messages
to DQ
0
Remedy
Analyze the diagnostic data.
Check the wiring.
---
---
are
3
237