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2)
PELV in accordance with the requirements of EN 60204-1 / 6.4 Optical short-circuits
must be avoided. Observe the operating instructions of the integrated devices. The safety-
related parameters (safety integrity level and response time) are dependent on the types
used.
•
Task
Connection of three cascaded single-beam photoelectric safety switches from the
L25 or L26 family to an UE410-MU/XU safety controller on a relay control/contac‐
tor control system.
Operating mode: With restart interlock and with external device monitoring.
•
Mode of operation
When the input conditions are valid, the system can be switched on and waits for
an input signal/switch-on signal. The system can be enabled by pressing and then
releasing the S1 pushbutton. The associated output of the UE410-MU/XU carries
voltage. When the input conditions are no longer met, the associated outputs of
the UE410-MU/XU switch off.
•
Fault analysis
A malfunction of the K1, K2 contactors is detected. The shut-down function is
retained.
In the event of manipulation (e.g., jamming) of the S1 pushbutton, the system will
not re-enable the output current circuits.
NOTE
If IO-Link is used on the device, the MF switching output with the factory setting Q
must be used.
If no IO-Link is used on the device, any of the switching outputs with the factory
setting Q can be used.
The single-beam photoelectric safety switch must not be supplied with voltage via
the IO-Link master.
4.5
Testing plan
The manufacturer of the machine and the operating entity must define all required thor‐
ough checks. The definition must be based on the application conditions and the risk
assessment and must be documented in a traceable manner.
b
When defining the thorough check, please note the following:
°
Define the type and execution of the thorough check.
°
Define the frequency of the thorough check.
°
Notify the machine operators of the thorough check and instruct them
accordingly.
The following thorough checks are often defined in connection with a protective device:
•
Thorough check during commissioning and modifications
•
Regular thorough check
Thorough check during commissioning and modifications
The test is intended to ensure that the hazardous area is monitored by the protective
device and that unprotected access to the hazardous area is prevented.
The following points are often helpful for the definition of the thorough check:
•
Does the thorough check have to be completed by qualified safety personnel?
•
Can the thorough check be completed by personnel specially qualified and autho‐
rized personnel?
•
Does the thorough check have to be documented in a traceable manner?
•
Can the thorough check be carried out according to a check list (
initial commissioning and commissioning", page 45
)?
PROJECT PLANNING
4
8024678/2020-01-24 | SICK
O P E R A T I N G I N S T R U C T I O N S | L25
23
Subject to change without notice