Pilz PSS SB NOT, Basic license - Manual (Page 66)

6-24 Modular Block System: Emergency Stop Circuits
Standard Function Blocks
Wiring for category 4
If you use two contactors in applications for category 4, please note the
following guidelines when using the various output modules:
• DOS: The contactors must be connected to adjacent blocks of 8
outputs (see “Installation Manual for the PSS 3000/PSS 3100
series”)
• DI2OZ: The contactors may be connected to a dual-pole output.
Connect the contactor output to K1 and K2.
• DI8O8: The contactors must be connected to two different single-pole
outputs in the range O
0
to O
5
. Alternatively, where the outputs
are so configured, the contactors may be connected to a dual-
pole output O
4
or O
5
(see “Installation Manual PSS SB
DI8O8”). In this case, connect the contactor output to K1 and
K2.
Functions
The contactors can only be switched on when they are in their start
position (
FbL1 =1 and FbL2 = 1).
The operation is monitored via acknowledgements from FbL1 and FbL2.
When switching on and off, acknowledgements must change state within a
maximum reaction time. This reaction time can be set within the range of
0 ... 2000 ms via input parameter
TFbL. If the maximum reaction time is
exceeded, an error message will be issued ( ENBL = 0) and the contactors
will be switched off immediately ( K1 = 0 and K2 = 0). The error will need to
be reset.
The time for feedback loop monitoring should be set as short as possible.
When
TFbL = 0, the default value for feedback loop monitoring will be
used from DW1002 of the administration data block (global parameter
RFbL, recommended value: 100 ms). The value for feedback loop
monitoring should in any case be less than the interval between
consecutive operations.
SB065