Festo 1971599, Manual

Page: 48 / 150

1. System overview CPX-FVDA-P2
1-18
Festo P.BE-CPX-FVDA-P2-EN en 1209NH English
the lack of cross-circuiting of the lines are checked. The cyc-
lical check results in a momentary potential shift of the out-
put voltage, which takes place simultaneously on the P- and
M-side. As a result, the output voltage remains largely un-
changed. Potential-free consuming devices are not influenced
through this.
The actual status of the operating mode is played back at the
same position in the input data.
Note
If the test pulses of cross-circuit monitoring are deactiv-
ated, the safety-engineering characteristic values change
(
appendix Tab. A/4).
Note
Cross-circuit monitoring supervises only the device’s own
circuits.
•
Make sure that cross-circuiting to other circuits are pre-
vented through appropriate installation measures.
Channel-wise passivation The “channel-wise passivation” can be switched on or off via
bit 7 of byte 1.
As long as the function is inactive (0 = off), the output mod-
ule also safely switches all channels off in case of a single
channel error in accordance with PROFIsafe specification and
signals errors to the F-Host through the flags “FV_activated”
and “Device fault”. The F-Host then passivates the output
channels of the module (F-Slaves), phases out the module
and sets the control bit “Activate_FV”.
If the function is active (1 = on), in case of a channel error,
the output module safely switches off only the output channel
in which the error occurred. Uninvolved output channels re-
main uninfluenced and the module remains integrated.