ABB FSO-21, Руководство пользователя

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54 Safety functions
General

Safety function request
A safety function can be activated locally from FSO digital inputs, from a safety PLC,
in FSO internal fault situations or by another safety function (see section
Dependencies between safety functions on page 193 ).
If you want to control a safety function with a push button, connect an activation
button to an FSO digital input. 24 V in the input is the non-request for a safety
function and 0 V is the request.
Note: The FSO module executes the requested safety function even if the request is
removed before the function has reached the acknowledgement criteria.
Note: With one input it is possible to activate up to two separate safety functions.
A request activates both functions simultaneously. For the execution order, see
section
Priorities between safety functions (page 193 ).
Note: The FSO module does not react to activation requests of the safety functions
during the boot.
Safe direction (SDI) With time or ramp monitoring
Only with an encoder 186
ID Description
A Normal request: The request is recognized when the button is pressed. The pressing
time of the button must be at least 20 ms.
Note : The safety function request must be removed before the acknowledgement is
accepted.
B Short low signals (less than 20 ms) are ignored.
C Safety function is activated when the request signal last at least 20 ms.
Safety function Stop category Information Page
A
Button release allowed
20 ms
B
Time
Button pressed
C