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PACMotion™ PSD Installation and User Manual
GFK-3168A
4.16.9.4
Dual Channel control, SIL CL3 / PLe
To achieve PLe / SIL CL3, the safe switching of the pulse inhibitor must be tested peri- odically by
analyzing the feedback signal from a safety control:
•
•
The inputs STO-ENABLE 1 and STO-ENABLE 2 are switched in turns according to a defined test
sequence. The switching state of the pulse inhibitor is available at the STO-Status outputs of the
PSD and must be analyzed to achieve a sufficient diagnostic cover ratio:
•
•
The test sequence for the functional test of the safe pulse inhibitor must be performed as shown in
the following time diagram.
Start conditions of the test sequence:
•
•
•
•
Figure 13:
Technical Description and Data
at the start of a system,
at the restart after triggering a protective device, at least every 8 hours by the operator.
Diagnostic with external not safe controller, test with dynamic sequence: test cycle: with
each device start, minimum once per day.
diagnostic cover ratio: 60 %
o
Diagnostic with external safe controller, test with dynamic sequence. test cycle: with each
device start, minimum once per day.
diagnostic cover ratio: 90 %
o
Operational readiness FAULT = "1"
Enable signal ENABLE = "0"
STO-ENABLE 1 = "0"
STO-ENABLE 2 = "0"
Dual Channel control, SIL CL3 / PLe
Section 4
September 2020
42
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