Pilz PSS SB HYD, Basic license - Manual (Page 177)

Modular Block System: Hydraulic Presses 6-115
Procedures
Unlock
If a request is made to open the gate ( RQST = 0/1 pulse edge) when the
gate is locked, the request will not be performed until the hazardous
machine functions have stopped (
STPD = 0/1 pulse edge).
Only then will the enable output be reset (if it was set) and the gate
unlocked (
UNLK = 1). The gate can then be opened.
Lock
If a request is made to lock the gate ( RQST = 0/1 pulse edge) when the
gate is closed but not yet locked, the gate will be locked ( UNLK = 0). When
the gate is locked ( LCKD = 1), the enable will be set directly (ARSt = 1) or
after a reset ( ARSt = 0), provided no other errors are present.
If a request is made to lock the gate ( RQST = 0/1 pulse edge) when the
gate is still open, the gate will remain unlocked and an error message will
be triggered (see section entitled “Error messages”).
Machine halted (input parameter MRun)
A function test can be triggered via this parameter: When the machine is
halted (MRun = 1/0 pulse edge), the enable is reset directly. As soon as
the hazardous machine functions have stopped, the gate is unlocked
(
UNLK = 1) and the operator is prompted to carry out a function test (see
section entitled “Error messages”). This function is independent of the
input parameter
NoFT.