Sequence Accumulation Time Processing - Mitsubishi Electric MELCEC Q Series User Manual

4. CPU MODULE
4.4.3

Sequence accumulation time processing

With QCPU-A, as the scan time becomes faster, it may affect the processing of FROM/TO
instruction or the scan time for special function modules.
Such problems can be avoided by using the following special relay and special register as
interlock and executing FROM/TO instruction in the unit of several ms.
(1)
Number Name
Sequence
M9077 accumulation time
measurement
Sequence
D9077 accumulation time
measurement
Procedure
Description
• Compares the setting value at D9077 with the time
ON: Timeout
OFF:Not timeout
*
*
• Stores the accumulation time used by M9077.
Accumulation
time setting
*
Details
elapsed from the start of measurement (accumulation
time) at every scan. Then, performs the following
operations:
Setting value Accumulation time
:
Turns on M9077 and clears the accumulation time.
Setting value Accumulation time
:
Turns from on to off M9077 and clears the
accumulation time.
When M9077 is already off, clears the accumulation
time.
When 1 to 255 is designated at D9077, M9077 is
turned on at the first scan.
When a value other than 1 to 255 is designated at
D9077, the value in D9077 is reset to 0 and M9077 is
always turned off.
Setting range: 1 to 255ms (Default: 5ms)
When a value other than 1 to 255ms is designated,
the value in D9077 is reset to 0.
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Set by
(Set at)
System
User