11 Maintenance
(continued)
11-2
C232-302-401/402/403/404-603 / C232/EN M/A23
In addition, a dynamic test can be used to check transmission performance and the
phase relation of the current transformers and the anti-aliasing filter.
A dynamic test is not absolutely necessary, since it only checks the stability of a few less
passive components. Based on reliability analysis, the statistical expectation is that only
one
component in 10 years in 1000 devices will be outside the tolerance range.
Additional analog testing is not necessary, in our opinion, since information processing is
completely numerical and is based on the measured analog current and voltage values.
Proper operation was checked in conjunction with type testing.
Binary inputs
The binary inputs are not checked by the self-monitoring function. However, a testing
function is integrated into the software so that the trigger state of each input can be read
out (‘Oper/Cycl/Phys’ folder). This check should be performed for each input being used
and can be done, if necessary, without disconnecting any device wiring.
Binary outputs
With respect to binary outputs, the integrated self-monitoring function includes even two-
phase triggering of the relay coils of all
the relays. External contact circuits are not
monitored. In this case, relays must be triggered by way of device functions or integrated
test functions. For these testing purposes, triggering of the output circuits is integrated
into the software through a special control function (‘Oper/CtrlTest/’ folder).
!
Before starting testing, open any triggering circuits for external devices so that no
inadvertent switching operations will take place.
Serial interfaces
The integrated self-monitoring function for the PC or communication interface also
includes the communication module. The complete communication system, including
connecting link and fiber-optic module (if applicable), is always totally monitored as long
as a link is established through the control program or the communication protocol.
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