Fail State Behaviour - Festo CTEU-CO Manual, Functions And Maintenance

1. Commissioning
1.7

Fail state behaviour

Behaviour
of the of the
fieldbus connected
device
Ok Timeout
Timeout Ok
Timeout
Tab. 1/6: Constellations of Fail state behaviour
Festo P.BE-CTEU-CO-OP+MAINT-EN en 1101NH
Fail state regulates the behaviour of the bus node and the
connected devices in the event of communication errors
(see section 2.3.3).
Note
As a prerequisite Node guarding or Heartbeat must be
activated on the master controller.
DIL switches Device:
Fail state Signals
switching applied by
position the bus node
Off are reset
On remain set
("Hold last
state")
Off are reset
On remain set
("Hold last
state")
Off are reset
On remain set
("Hold last
state")
Diagnostics
Master controller reports a con-
nection fault
The "X1" and/or "X2" LED on the
bus node illuminate red
"MNS" LED on the bus node illu-
minates red
The "X1" and/or "X2" LED on the
bus node illuminate red and
"MNS" LED on the bus node illu-
minates red
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