
2If the risk analysis indicates the use of a monitored interlock then a variant with the monitored
interlock is to be used, marked with the > symbol in the ordering code.
The actuator monitoring variant (B) is a safety switch with an interlock function for process protection.
The safety function consists of safely switching off the safety outputs when the safety guard is unlocked or opened and
maintaining the safe switched off condition of the safety outputs for as long as the safety guard is open.
2Interlocks with power to lock principle may only be used in special cases after a thorough evaluation of
the accident risk, since the safety guard can be opened immediately on failure of the power supply or
upon activation of the main switch.
Series-wiring
Series-wiring can be set up. In the case of a series connection, the risk time remains unchanged and the reaction time
increases by the sum of the reaction time of the inputs per additional unit specified in the technical data. The quantity
of devices is only limited by the cable drops and the external cable fuse protection, according to the technical data. Up
to 31 device variants with serial diagnostics can be wired in series.
2The user must evaluate and design the safety chain in accordance with the relevant standards and the
required safety level. If multiple safety sensors are involved in the same safety function, the PFH values of
the individual components must be added.
2The entire concept of the control system, in which the safety component is integrated, must be validated
to the relevant standards.
2.4 Warning about misuse
2In case of improper use or manipulation of the safety switchgear, personal hazards or damages to
machinery or plant components cannot be excluded. There are no residual risks, provided that the safety
instructions as well as the instructions regarding mounting, commissioning, operation and maintenance
are observed.
2.5 Exclusion of liability
We shall accept no liability for damages and malfunctions resulting from defective mounting or failure to comply with
the operating instructions manual. The manufacturer shall accept no liability for damages resulting from the use of
unauthorised spare parts or accessories.
For safety reasons, invasive work on the device as well as arbitrary repairs, conversions and modifications to the device
are strictly forbidden, the manufacturer shall accept no liability for damages resulting from such invasive work,
arbitrary repairs, conversions and/or modifications to the device.