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Understand the Operation of Safety Functions
Controlling Devices
Controlling Devices - Sample Requirements
Device
Requirement
Emergency stop
Use approved devices with direct opening mechanisms
switches
complying with IEC/EN 60947-5-1.
Door interlocking
Use approved devices with direct opening mechanisms
switches,
complying with IEC/EN 60947-5-1 and capable of switching
limit switches
microloads of 24V dc 3 mA.
Safety sensors
Use approved devices complying with the relevant product
standards, regulations, and rules in the country where used.
Relays with forcibly-
Use approved devices with forcibly-guided contacts
guided contacts,
complying with EN 50205. For feedback purposes, use
contactors
devices with contacts capable of switching micro loads of
24V dc 3 mA.
Other devices
Evaluate whether devices used are appropriate to satisfy the
requirements of safety category levels.
Publication 1791DS-UM001H-EN-P - April 2009
See the table for sample requirements for controlling devices.
Use appropriate devices as indicated in the Controlling
ATTENTION
Devices - Sample Requirements table. Serious injury may
occur due to loss of safety functions.
Allen-Bradley Bulletin Safety Components
Bulletin 800F, 800T
Bulletin 440K, 440G, 440H for interlock switch
Bulletin 440P, 802T for limit switch
Any Guardmaster product
Bulletin 700S, 100S
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