Pilz PSS SB NOT, Basic license - Manual (Page 57)

Modular Block System: Emergency Stop Circuits 6-15
AuSt = RLO-1 (M 110.01): No initial reset required.
Sequence: When the PSS is powered up or cold started or the
I/O-Group is started (GRP = 0/1-pulse edge), the enable is
triggered without a further reset.
NC_1 = 1 and NC_2 = 1 is
also required in order to set the enable.
• ARst: Automatic reset when E-STOP button is released
ARst = RLO-0 (M 110.00): Reset through input parameter
RSET is required
ARst = RLO-1 (M 110.01): Automatic reset required when E-
STOP button is released
• FTST Function test
FTST = RLO-0 (M 110.00): No function test required
FTST = RLO-1 (M 110.01): A function test must be performed
if a synchronisation error occurs when the E-STOP button
is released.
Output parameters
• ENBL: Enable flag bit
ENBL = 0: Enable is blocked
ENBL = 1: This function is error-free, the E-STOP button
has not been operated
Function test
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.
Irrespective of parameter
FTST, a function test must always be performed
if a synchronisation error occurs when the E-STOP button is operated.
The function test will check whether both contacts on the E-STOP button
are switching synchronously.
Sequence of function test:
• Press E-STOP button
• Release E-STOP button
• Press reset button (input parameter RSET)