ER/MT (error/main‐
tenance)
FB<n> - LED Maintenance Message
Flashes Flashes
Interrupt
● Wire break
● Short-circuit
● Signaling of pending DPV0 alarms of the field device
You can find information on this in section "CFU PA:
Displaying DPV0 alarms on CFU PA LEDs
(Page 98)".
Flashes Flashes
Necessary
● Warning limit exceeded
● Service port enabled
ON
ON
Requirement
● Alarm limit for voltage and/or current exceeded/
fallen below
● Error during the startup phase of the field device
– No communication possible
– Automatic addressing failed
– Reading out of IOs failed
– Setting of Selected IO failed
– The configured field device and the selected IO in
PDM are not compatible
● Name of the field device (TAG) does not match HW
Config
You can find information on this in section "CFU PA:
Comparing TAGs (Page 98)".
● Error while using the service interface (service port
enabled)
– You can find information on this in section "CFU
PA: Using service interface (Page 124)".
– A field device is identified as unknown if it was not
last one in operation on this CFU at one of the
other fieldbus connections.
● PROFIBUS PA address in the CFU and in the field
device do not match.
You can find additional information on this in section
"CFU PA: Startup of field devices depending on the con‐
figuration (Page 68)".
9.3 Diagnostics with the Maintenance Station
The device diagnostics indicates the maintenance statuses of the individual channels of the
CFU on the Maintenance Station:
A faulty IO device (sensor, actuator or field device) does not trigger indication of a faulty CFU.
The CFU signals the respective status for each channel or for each PROFIBUS PA field device
(only for CFU PA).
Diagnostics of the CFU
9.3 Diagnostics with the Maintenance Station
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD 111
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