Interrupts, error messages, diagnostics and system alarms
5.1 Status and error displays
IM 157-1 DP (6ES7157-1AA00-0AB0)
Equipment Manual, 08/2021, A5E32100641-AE
23
Meaning of the LEDs
The following tables set out the meaning of the status and error displays. Corrective
measures for diagnostics alarms can be found in the section Diagnostics alarms (Page 34).
LED RUN, LED ERROR, LED MAINT
Table 5- 1 Status and error displays of the LEDs RUN, ERROR, MAINT
Meaning Solution
Supply voltage at interface module miss-
ing or too low
Check the supply voltage or switch it on
on the interface module.
On
On
On
Test of LEDs during startup: The three
LEDs light up simultaneously for approxi-
Flashes
Off
Off
Interface module is deactivated.
Activate the interface module with the
configuration software or the user pro-
Interface module is not configured.
Configure the interface module with the
configuration software.
ET 200AL is being assigned parameters.
vant
vant
ET 200AL is currently exchanging data
with the DP master.
vant
Flashes
vant
Group error and group error channels
Evaluate the diagnostics and eliminate the
error.
The preset configuration does not corre-
spond to the actual configuration of the
ET 200AL.
Check the configuration of the ET 200AL
to see whether a module is missing, de-
fective or if a module that is not config-
ured is connected to ET-CON1 or
Parameter assignment error in the I/O
module
Evaluate the display of the module status
in STEP 7 or in STEP 7 (TIA portal) and
correct the errors in the I/O module.
vant
vant
Hardware or firmware faulty.
1
Replace the interface module.
Flashes
vant
vant
(all LEDs remain in their current state
while the firmware update is being writ-
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