Operating Manual: PSS 3075-3 Series
4-5
• The output power-up tests are a component part of the system’s self
check. The self check is carried out when voltage is returned, on start up
(transfer from STOP-RUN) and also during operation.
• Operating system call SB255, function 2 in OB120 is required to
deactivate the power-up test on start up. To deactivate the power up-test
during operation, the operating system call must be contained in a block
that is run as part of each cycle. The power-up test will be performed
again as soon as the operating system call is no longer present.
NOTICE
Each time SB255, function 2 is called, data words DW200, DW201 and
DW202 must be written in full to ensure that outputs are not excluded from
the power-up test unintentionally, due to data words being unwittingly
overwritten during the program cycle.
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