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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.
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
t
: Pulse length for switch-on test (200 µs)
1
t
: Repetition time under certain circumstances (6.5 ... 10 ms)
2
t
: Scan time for switch-on test (ca. 2 m)
3
, O
, O
and O
0
2
4
, O
, O
have a common second shutdown
1
3
5
Operating Manual
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