Safety functions of PM330
8.4 Diagnostics test/online test
Power Module PM330
114
Hardware Installation Manual, 12/2018, A5E32844552B AF
8.4
Diagnostics test/online test
In order to ensure that the function of the switch-off signal paths comply with the
requirements laid down in the applicable standards, regulations and guidelines, these must
be tested at regular intervals (diagnostics test interval, "Diagnostic test" in accordance with
IEC 61800-5-2). As a consequence, possible faults are detected in an acceptable time. The
intervals depend on the safety function and the desired/required SIL / PL, Cat.
Your task is to ensure that this test of the switch-off signal paths (test stop: activating and
deactivating an STO) is performed at regular intervals.
The external safety relay (e.g. 3SK11…), an F-PLC or similar can, based on the signal
change of the feedback signals of the PM330 Power Module, detect possible faults/errors in
the switch-off signal paths, therefore initiating an STO in both channels. A fault is thus
detected and the system can be repaired.
8.5
Relationship between the test stop interval and SIL or PL and Cat.
The hardware, the hardware structure and, where applicable, the software (when using
parameterizable or programmable external safety components), must correspond to the
required SIL / PL and Cat.
Also see the application examples in the annex.
●
SIL 2 / PL d: Test stop at least once per year
●
SIL 3 / PL e, Cat. 3: As a minimum, a test stop every 3 months
●
SIL 3 / PL e, Cat. 4: Test stop at least once per day
8.6
Safe brake control/brake control in general
If brake control is required, see Chapter "Brake control via external relays/controls
(Page 114)".
PM330 incl. CU230P-2 is not suitable for controlling a brake. Both devices do not have the
appropriate signals and have no option of connecting a brake control. Existing contacts have
the incorrect logical signal, and in addition are unsuitable from an electrical perspective.
-> external application-based brake control, see Chapter "Brake control via external
relays/controls (Page 114)".
8.6.1
Brake control via external relays/controls
If a brake control, or more specifically safe brake control is required, then this must be
implemented externally using an appropriate application, e.g. using a safety relay, a F-PLC
or similar, outside of the PM330 and the CU230P-2.
It must also be taken into consideration that safe brake control also requires the appropriate
brake diagnostics.
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