Festo 1971599, Manual

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Contents and general instructions
XXIV
Festo P.BE-CPX-FVDA-P2-EN en 1209NH English
Product-specific terms and abbreviations
Term/abbreviation Significance
Acknowledgment Signal or procedure for depassivation. Through acknowledgment, the user
confirms that the module can be reentered or the output channel
depassivated without danger.
If the complete module is passivated, acknowledgment is made through
regular reentry (standard process of PROFIsafe).
If an output channel is passivated (channel-wise passivation),
acknowledgment takes place through an acknowledgment signal of the
process image (
section 1.2.3).
Black channel The transmission channels of PROFIBUS and PROFINET IO are not
influenced by PROFIsafe. They do not have to be looked at more closely
with regard to PROFIsafe and are therefore designated “black channels”.
Channel Output channel
Channel-wise
passivation Passivation type in which only the faulty output channel involved is
passivated. The module remains integrated. Acknowledgment takes place
in CPX-FVDA-P2 via the process image (
section 1.2.3).
CRC signature Check value in the safety telegram of PROFIsafe for checking the integrity
of the telegram data (cyclic redundancy check).
Cross circuit Accidental bypasses in switches, e.g. between 0 V and FE. These can be
caused, for example, by cable squeezes and unallowed currents in
switches. If, for example, 0 V and FE are connected to each other in the
system power supply, a cross circuit between the 0 V current path and FE
behind the M-switch results in bypassing the switch. The switch thus
becomes ineffective. In a similar way, a cross circuit can result in bypassing
the P-switch.
Cross-circuit
monitoring Function that detects possible cross currents in the device's own circuits
and switches the device or the output channel into a safe status. This
prevents undesired switching of the load due to impermissible cross
currents.
Depassivation Reentry or passivation (opposite)
F-Device Collective name for safety-related devices
F-Host Safety controller for control of safety-related devices
Forced dynamisation Procedure for function checking of a device’s switching capability.
The effectiveness of the P- and M-switches of the output module
CPX-FVDA-P2 are checked cyclically for their operational capability.