Instruction Manual

C. General information on parametrisation
C−8
Festo P.BE−CPX−SYS−EN en 0902e
C.3 Influence of signal states
You can influence the signal states of the CPX terminal
through the following functions:
Function
Priority Brief description Signals able to
be influenced
Forcing
2)
1 Influences signal states independently of actual
signal states (see also section C.3.1)
I/O signals
Fail safe 2 Determines signal states that become effective with
fieldbus communication faults (see also section
C.3.2)
A signals
Idle mode
1)
3 Determines signal states that become effective
when changing into the Idle status (see also section
C.3.3)
A signals
1) Only relevant for certain fieldbus protocols
2) Mainly used for test purposes in the commissioning phase.
Tab.C/1: Functions for influencing signal states
If several functions are active at the same time, the following
applies:
 Force signals have the highest priority
 Fail−safe signals have precedence over Idle mode signals.
Overview on the Force, Fail safe and Idle mode func
tions
Influencing output signals
With system parameters, you enter the fundamental settings
for the respective function. With appropriate setting of the
system parameter, you can determine, through channel−
specific module parameters, the desired signal state for each
channel individually. The following diagrams give an overview
of this: