12.2 Routine Functional Testing
The P634 is used as a safety device and must therefore be routinely injection
tested for proper operation. The first functional tests should be carried out
approximately 6 to 12 months after commissioning. Functional tests should be
performed at intervals of 2 to 3 years – 4 years at the maximum.
The P634 incorporates in its system a very extensive self-monitoring function for
hardware and software. The internal structure guarantees, for example, that
communication within the processor system will be checked on a continuing
basis.
Nonetheless, there are a number of subfunctions that cannot be checked by the
self-monitoring feature without injection testing from the device terminals. The
respective device-specific properties and settings must be observed in such
cases.
In particular, none of the control and signaling circuits that are run to the device
from the outside are checked by the self-monitoring function.
P634 12 Maintenance
12-4 P634/EN M/R-42-A // P634‑311‑653
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