Pilz PSS SB NOT, Basic license - Manual (Page 61)

Modular Block System: Emergency Stop Circuits 6-19
AuSt = 1: No initial reset required
Sequence: When the PSS is cold/warm started or the I/O-
Group is started (GRP = 0/1-pulse edge), the enable is
triggered without a further initial reset.
NC_1 = 1 und NC_2 = 1
is also required in order to set the enable.
• ARSt: Automatic reset when E-STOP button is released
ARSt = 0: Reset through input parameter RSET is required
ARSt = 1: Automatic reset required when E-STOP button is
released
• FTST Function test
FTST = 0: No function test required
FTST = 1: A function test must be performed if a
synchronisation error occurs when the E-STOP button is
released.
• RSET: Reset button (N/O contact)
RSET = 0/1-pulse edge: Reset occurs
RSET should be assigned RLO-0 if you do not need a reset
button (e.g. with automatic reset).
Output parameters
• ENBL: Enable bit
ENBL = 0: Enable is blocked
ENBL = 1: This function is error-free, the E-STOP button
has not been operated
Function test
The function test will check whether both contacts on the E-STOP button
are switching synchronously.
A function test must always be performed if a synchronisation error occurs
when the E-STOP button is operated.
Input parameter
FTST can be used to establish whether or not a function
test is required if a synchronisation error occurs when the E-STOP button
is released.