Festo 1971599, Manual

Page: 29 / 150

Contents and general instructions
XXVII
Festo P.BE-CPX-FVDA-P2-EN en 1209NH English
Term/abbreviation Significance
P-switch (High side
switch) Switch in the 24 V current path of an output channel.
For each output channel, there is a 24 V- and a 0 V-current path between
which the load is switched. With the CPX-FVDA-P2, these current paths are
switched in common and simultaneously but independently of each other.
The P-switch switches the 24 V current path and the M-switch the 0 V
current path of the output channel. For voltage to be present at the load,
both switches (P- and M-switches) must be closed.
For CPX-FVDA-P2, the control of P- and M-switches of an output channel is
taken over by different microcontrollers for safety reasons.
Reentry Switching of replacement values to programmed values or process values
(depassivation)
Passivation.
Reentry is a standard process of PROFIsafe to depassivate a passivated
module (
PROFIsafe standard).
Replacement value Preset safe value which replaces the real process value or the programmed
value in case of error or when safety-related systems are run up. For
CPX-FVDA-P2 (digital outputs), the output value is 0.
Safe status Status in which the safety of a system is achieved.
Safety circuit Output module CPX-FVDA-P2 with all connected consumers. A safety circuit
is formed by supplying the load to be operated for safety engineering from
one output (CH0, CH1, CH2) of the CPX-FVDA-P2. A switched-on (supplied)
load can either be switched off on request (via PROFIsafe) in a
safety-oriented manner or the module automatically switches off the load
for safety reasons upon detection of a safety-engineering-relevant error.
Safety controller A safety controller is usually a programmable logic controller with special
design elements for processing safe input information into safe output
information in order to guarantee the required amount of safety integrity
when used in safety-critical systems.
Safety integrity Effectiveness of the safety functions of a safety-related system under
request-conforming conditions.
Safety integrity level Level of safety integrity (Safety integrity level) for safety-related systems in
accordance with IEC 61508. There are 4 levels (SIL1 to SIL 4). SIL 1 is the
lowest level and SIL 4 the highest level of safety integrity. The higher the
level, the less likely is an endangering failure of the system.
Safety-oriented
communication Exchange of safety-related messages between F-Host and F-Device (e.g. via
PROFIsafe)
Safety-oriented
control circuit Safety circuit including safety-oriented activation through the controller.