Signal Status In The Event Of An Error (Fail Safe) - Festo MSE6-E2M Original Instructions Manual

A General fundamentals on system parameterisation
A.1.2

Signal status in the event of an error (fail safe)

Fundamentals
With the aid of the so-called fail safe parameterisation, the signal status which the outputs are to as­
sume in the event of fieldbus communication errors, can be determined (fail safe status). In this way, a
defined machine/system status is to be created in the event of fieldbus communication errors (e.g.
failure of the higher-order controller).
Warning
Uncontrolled movements of the machine and the system resulting from manipulation of
signal states.
Injury to people, damage to the machine and system
• Note information on Fail Safe parameterisation in the CPX system description
(è Tab. 1).
Parameterisation
With the MSE6-E2M, fail safe parameterisation can be used for output data.
By means of the system parameter "Fail safe", you can globally define the signal status which the out­
puts are to assume in the event of fieldbus communication errors, e.g. in the event of:
– Communication failure (network interruption, PLC failure)
– Communication stop.
System parameter
Fail safe
Tab. A.4 System parameter "Fail-safe"
Festo – MSE6-E2M-SY-EN – 1703d – English
Settings
Reset outputs
(presetting)
Hold last state
Assume Fault mode
value
Description
Reset all outputs, shut-off valve switches to the
"Pressurisation" state
Retain current signal status for all outputs
Accept the signal status defined for the relevant
channel
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