Pilz PSS Series Operating Manual page 11

PSS SB DI8O8
WARNING!
When wiring an output with capacitance, you must be aware of the
following:
• An output that is switched off is tested by switching it on each cycle,
approx. once every 2 minutes.
• The pulse length of a switch-on or switch-off test is 200 µs
• Under certain circumstances, the switch on or switch-off test may be
repeated after 6.5 ... 10 ms.
• The internal resistance of an output is 0.35 Ohm
Failure to observe the values for wiring with capacitance may cause the
load to switch on unintentionally.
t
1
t
2
t
3
If an error occurs, all the outputs in the affected I/O group will be switched
off and the I/O-group will switch to a STOP condition. An error telegram
will then be stored on SafetyBUS p and the error will entered in the PSS
SB DI8O8 error buffer.
Outputs O
route. This means that, with single-channel operation, these outputs can
be used for applications up to and including category 3, in accordance with
EN 954-1. Please note that the second shutdown route is only tested when
the system switches from STOP to RUN.
A feedback loop must be used on safety-related applications. To achieve
category 4, dual actuators must be connected to two different outputs.
8
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: Pulse length for switch-on test (200 µs)
: Repetition time under certain circumstances (6.5 ... 10 ms)
: Scan time for switch-on test (ca. 2 m)
, O , O and O
0 2 4
, O , O have a common second shutdown
1 3 5
Operating Manual