Festo — CPX-F8DE-P — 2022-10d
Safety
17
Term/abbreviation
Meaning
Acknowledgement
Signal or procedure for depassivation. An acknowledgment from
the user confirms that the input module can be brought back on
line without danger, and/or that the input channel can be depassi-
vated without any risk. If the complete input module is passivated
(
è
module-wise passivation), the acknowledgment is sent by regular
è
reintegration (standard PROFIsafe process).
If one input channel is passivated (
è
channel-based passivation), the
acknowledgment is sent by an acknowledgment signal of the process
image
2.2.3 Bit pattern of the output and input data (F-user data).
Reintegration
Reintegration is the standard PROFIsafe process for reintegrating passi-
vated modules.
Black channel
("Black Channel")
The “black channel” is the name given to a transmission route without
safety engineering properties across which secure communication is
possible by the addition of fail-safe mechanisms. For example, the
fieldbus and the bus node (PROFIBUS or PROFINET IO) are part of
the black channel through which the PROFIsafe communication is pro-
cessed.
Sensor
In the context of the safety engineering evaluation a sensor is a device
that converts the safety engineering status of a system into digital
switch signals, e.g. emergency stop switch, light curtain, door switch.
Safe state
Status in which a system works with secured process values or safe
substitute values to prevent potentially dangerous movements or other
types of hazard.
Safety classification
Specification for functional safety, consisting of
è
Performance Level,
è
category and
è
safety integrity level.
Safety-related communica-
tion
Exchange of safety messages between the F-Host and F-Device (e.g. via
è
PROFIsafe).
Safety pilot circuit
Safety circuit including safety-related control by the controller.
Safety integrity
Effectiveness of safety functions in a safety-related system under
requirement-based parameters governing the use of a product
(e.g. voltage, temperature, industrial environment, PELV).
Safety integrity level
Safety integrity level (SIL) for safety-related systems in accordance with
EN 61508. There are 4 levels (SIL 1 to 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 chain
All elements of a safety device.