Siemens SIMATIC ET 200X, Manual

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Commissioning and Diagnostics
5-17
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
5.3.3 LEDs on expansion modules (except DESINA)
SF LED (system fault display)
Some ET 200X expansion modules have an ”SF” LED:
EM 142 DO 4 DC 24V/2A expansion module with digital outputs
(6ES7 142-1BD40-0XB0)
PM 148 DO 4 DC 24V/2A power module
All expansion modules with analog inputs
All expansion modules with analog outputs
Parameterizable and non-parameterizable diagnostic messages
There are parameterizable and non-parameterizable diagnostic messages.
Non-parameterizable diagnostic messages are issued without you having to take
any action. You have to set parameterizable diagnostic messages in the
configuration software for them to be issued (refer to Table 5-10 onwards).
SF LED On
The SF LED on the expansion module is turned on as soon as a diagnostic
message is triggered by the expansion module.
Status display
In addition, all the ET 200X modules have a status display for every input and
output. The LEDs are lit when the inputs and outputs are active.
Status display of the EM 141 DI 8 DC 24V DIAG (6ES7 141-1BF40-0AB0)
In the case of the expansion module there are 2 LEDs for each channel (X1 to X8)
for status display:
Green LED
The LED is green when the input is active.
Red LED
The LED is red when there is a fault on the channel:
– Short circuit of the 24 V sensor power supply
– Digital input wire break