18
Festo — CPX-F8DE-P — 2022-10d
Safety
Term/abbreviation
Meaning
Safety circuit
Total of all signals processed for a safety function and their sources.
Example: 2 door switches including wiring and 2 related discrepancy-
monitored inputs, their monitoring and the related safety engineering
actuator technology.
Safety program
Safety-related user program in the F-Host.
Safety control unit
Programmable logic controller with special elements for processing safe
input information into safe output information.
SIL
è
safety integrity level.
SIL CL
SIL Claim Limit: claim limit for subsystems in a safety-related electrical
control system.
Clock output
Output with a specific clock signal that is directed by a sensor and is
detected by a related input. This clock signal is clearly distinguished
from other similar functional cycles and enables diagnostics of cross
circuits on the switched signals.
Clock signal monitoring
In the function modes with clock signal monitoring, the inputs are used
to detect if the actual clock signal, an external clock signal or the sensor
power supply is applied. The information is not released in the PROFI-
safe input image until the anticipated clock signal has been detected.
Test pulse
Fast switch pulse (e.g. from OSSD sensors) for monitoring the
switching capacity and detection of cross circuits
è
forced switch on/off. Test impulses are tolerated up to a max. dura-
tion of 0.7 ms.
Reintegration
Switching from substitute values to process values = depassivation
(
è
passivation).
Reintegration is a standard PROFIsafe process for depassivation of a
passivated module (PROFIsafe specification).
Forced switch on/off
Function testing procedure to determine the switching capacity of sig-
nals. The procedure is often used with outputs in the form of test pulses
and on clocked inputs. Generally speaking, many safety-related signals
can be found to have forced switch on/off for detection of short circuits
and cross circuits.
Tab. 8: Product-specific terms and abbreviations
