Siemens IM 155-6 PN ST - LED Error Display Principle of Operation

Interrupts, diagnostics, error, and system messages
5.1 Status and error displays
IM 155-6 PN ST interface module (6ES7155-6AU01-0BN0)
Manual, 04/2017, A5E03576904-AE
31
Principle of operation
You determine the information for cause of the error with the LED error display. After
notification by the flash signal, the error type is displayed followed by the error location/error
code.
The LED error display
● is active during POWER ON as well as during operation.
● has priority before all other states displayed by the ERROR and MAINT LED.
● remains turned on until the cause of the error has been corrected.
Table 5- 4 Display of error type and error location
Sequence
Description
1 The ERROR and MAINT LEDs flash 3x at
0.5 Hz
Signaling of error type
2 MAINT LED flashes at 1 Hz Display of the error type (decimal)
3
The ERROR and MAINT LEDs flash 3x at 2 Hz
Signaling of error location/error code
4 The ERROR LED flashes at 1 Hz Display of tens digit (decimal) of the error loca-
tion/error code
5 The MAINT LED flashes at 1 Hz Display of ones digit (decimal) of the error loca-
tion/error code
6
Repeat steps 1 to 5 until the cause of the error has been corrected.