Disabling Cmu Program Operations - Hitachi CMU Series User Manual

4 OPERATION

4.4 Disabling CMU Program Operations

The CMU may malfunction due to a faulty HI-FLOW program or task (e.g., NX) stored in the
flash memory. In this case, by setting the T/M switch (for the model LQP520) or BATT.SEL
switch (for the model LQP525 and LQP527) in "A" position and then powering on the CMU, you
can start up and run that CMU without loading in the faulty HI-FLOW program or task from the
flash memory. After startup is achieved in this manner, use various tools as needed to change
the HI-FLOW program or task.
In the case of the models LQP525 and LQP527, when the CMU is started up with the BATT.SEL
switch set in "A" position, its main memory is cleared. To prevent the loss of the main
memory's contents, back them up in files with the ladder chart system's FD function or other
similar facility before you set the BATT.SEL switch in "A" position.
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