Festo — CPX-F8DE-P — 2022-10d
System overview CPX-F8DE-P
29
No.
Sequence
Channel-
based passi-
vation
1)
Electrical
status at
input
Status in the
input
image
2)
Qualification
bit
2)
Acknowledg-
ment of the
channel
error
1)
2
Module has detected
the channel error
1 (active)
X
0
0
0
F-Host detects the
channel error in the
module
3
User clears a channel
error
User acknowledges
the channel error
(minimum 1 F I/O
cycle
1 (active)
X
0
0
1
4
Channel is no longer
passivated
1 (active)
X
X
1
X
The contents marked in bold represent the bits relevant for the relevant row in the table.
X: signal can be 0 or 1
1) Bit in the output image
è
Tab. 17
2) Bit in the input image
è
Tab. 18 , byte 1
Tab. 18: Sequence description of channel error acknowledgment – example
Acknowledgment can be made automatically by holding the acknowledgment bit permanently at “1”.
If acknowledged while an error is still present, the input image remains in safe mode. In the event of
unwanted automatic acknowledgment, a safety program must ensure that the safety controller cancels
that acknowledgment.
NOTICE
In the event of a restart of the F-Host (Stop
è
Run) the channel monitoring of the input module
CPX-F8DE-P is restarted.
If the cause of the error is still pending, the channel error will be triggered again.
2.3
Mode of operation of the input module
The inputs on the input module are always evaluated by 2 independent internal channel paths. For this
purpose the input module is equipped with 2 processors that monitor each another continuously and
can also monitor the input channels for cross circuit, depending on the selected function modes.
The input module is designed so the input channels can provide either secure data or no data at all,
even if there is an error in the system, e.g. with:
–
overvoltage, undervoltage, overload, short circuit and cross circuit
–
PROFIsafe communication failure or malfunction
–
failure or defect of individual safety-determining components of the input module.
