Mt Led; Act Led - Siemens ET 200SP HA Equipment Manual

Displays and interrupts
7.2 LEDs
7.2.3

MT LED

Definition
The MT LED provides maintenance information.
Description
The MT LED indicates the following maintenance status:
Note
Redundant interface modules (IM): Maintenance LED and ER LED are illuminated on both
IMs
If the station was configured with V1.0 in HW Config and both IMs have different firmware
versions, the following behavior can occur:
Maintenance LED and ER LED are illuminated on both IMs.
The cause can be a firmware update of a redundant interface module (IM) from V1.0.x to a
higher version or replacement of an IM.
Solution: Make sure that both IMs have the same firmware version.
7.2.4

ACT LED

Definition
The ACT LED indicates the status of the IM. It is only relevant for IO devices with redundant IM.
30
MT LED Meaning
Maintenance is not required.
Off
Maintenance is required, meaning that at least one maintenance event has occurred.
On
Equipment Manual, 09/2021, A5E39262148-AE
IM 155-6 PN HA