EN60204
EN 954-1 ISO 13849-1
Safety door monitoring or
emergency shut-down WITHOUT
protection monitoring switch
The ‚STO’ is tripped when the safety
door is opened or emergency shut-
down switch is activated.
Cat. 3 PL d 0
Explanation
The signals for STO1# and STO2# are delivered utilizing two separate channels. The wiring layout plan must
allow for the physical separation of the wiring channels or incorporate adequate insulation protection and
separation.
Note
The acknowledgement is only permissible with category B.
The acknowledgement is not permissible for use if the dangerous area is accessible. In this case,
employment of an external acknowledgement unit is necessary.
The acknowledgement is only necessary, when after the cancellation of the STO function by the
automatic start-up, a potential danger for the people in the area or the equipment exists.
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