Siemens SIMATIC ET 200AL System Manual page 168

DP LED
Table 5- 2 Status display of the DP LED
DP LED
Off
On
LED ET-CON1, LED ET-CON2
Table 5- 3 Status displays of the LEDs ET-CON1 and ET-CON2
LEDs
ET-CON1 ET-CON2
Off
On
Interface module IM 157-1 DP (6ES7157-1AA00-0AB0)
Manual, 12/2016, A5E32100641-AD
Interrupts, error messages, diagnostics and system alarms
Meaning
There is no connection between the
PROFIBUS interface of your PROFIBUS
device and a communication partner (e.g.
DP master).
There is no connection between the
PROFIBUS interface of your PROFIBUS
device and a communication partner (e.g.
DP master).
Meaning
There are no I/O modules available at the
respective ET-Connection or the modules
do not have supply voltage.
A communications connection to at least
one IO module at the corresponding ET-
Connection is available.
5.1 Status and error displays
Solution
Check whether the bus cable to the DP
master is disconnected.
-
Solution
Check the wiring for the ET-Connection or
the supply voltage for the I/O module.
-
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