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External addresses used in the logic program
(connection device) are target addresses updated at the defined
frequency. Other addresses that are not used in the logic program
are not part of the target address list.
External addresses for which communication scanning has stopped are
not targets either.
-
They are processed only when the power is ON or
controller is reset.
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The effect is different from typical processes,
depending on the speed of address refreshing.
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For communication checking after running a logic
program, monitor the L system variable " #L_RefreshEnable" in the
logic program.
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If a communication error occurs when the power is
ON, not even the logic program will run.
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A connection device that stopped communication
scanning retains its status before stopping the scanning.
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If [External Equipment Operations] is
[Synchronous], the logic will not operate until communication
synchronization with the external device is checked.
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If [External Equipment Operations] is
[Synchronous], communication synchronization is checked even when
[Logic Program Operation] is [STOP].
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In a Logic Program, when Backup Internal Device
is set up, do not enable internal addresses. When powering up the
display unit, restoring backup data from SRAM to internal addresses
is not synchronized with starting the logic program. As a result,
the logic program could not load and run before backup data is
restored.
When you want to back up data used in the logic program, set up
retentive variables.
30.3.2.4 Retentive Variable
Settings
