Festo CPX-F8DE-P Manual page 30

Contents and general instructions
Term/abbreviation
Replacement value
Safe status
Safety chain
Safety circuit
Safety classification
Safety control
Safety integrity
Safety integrity level
Safety-oriented
control circuit
Safety program
Safety-related
communication
Sensor
Short circuit
XXVIII
Significance
Preset safe value that replaces the real process value and/or the
programmed value in the event of a malfunction and when booting
safety-related systems.
With CPX-F8DE-P (digital inputs) a value of 0 is transmitted in the input
image.
Status in which a system works with secured process values or safe
substitute values to prevent potentially dangerous movements or other
types of hazard.
All elements of a safety unit.
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 technical
safety actuators.
An indicator of Functional Safety comprising è Performance Level,
è Category and è Safety integrity level.
Programmable controller with special elements for processing safe input
information into safe output information.
Effectiveness of safety functions in a safety-related system under
requirement-based parameters governing the use of a product (e.g.
voltage, temperature, industrial environments, PELV)
Safety Integrity Level for safety-related systems in acc. with EN 61508.
There are 4 levels (SIL 1 thru SIL 4). SIL 1 is the lowest level and SIL 4 is
the highest level of safety integrity. The higher the level the less probable it
is that the system will fail in a dangerous manner.
Safety circuit including safety-oriented activation through the controller.
Safety-based user program in the F-host.
Exchange of safety-related messages between F-Host and F-Device (e.g. via
è PROFIsafe).
In the context of a technical safety evaluation, a sensor is a device that
converts the technical safety status of a system into digital switch signals,
e.g. emergency stop switch, light curtain, door switch.
Connection of switching points with normally different electrical potentials,
e.g. of 0 V and 24 V of one voltage source.
Festo P.BE-CPX-F8DE-P-E N en 1610a English