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MELSEC-Q
7 FUNCTION
7.20.3 Processing time
The following chart shows the processing times of the high speed interrupt function
between a start and an end.
High speed interrupt end
Main routine program
Waiting time
High speed interrupt start
X input
Buffer memory read
I49 overhead
High speed interrupt program execution
Buffer memory write
Y output
High speed I/O refresh and high speed buffer transfer take the following processing
times in their processings.
Processing Item Processing Time
Waiting time
• Max. 37.5
s or more than 37.5 s instruction processing time
• Max. 40
s when MELSECNET/H, CC-Link or intelligent function modules are
mounted on extension base.
High speed interrupt start high
speed interrupt end
22
s
X input
(1) Main base
Time = 0.14
(total number of X points) 0.65 (number of settings) 0.85
(2) Extension base
Time = 0.21 (total number of X points) 0.65 (number of settings) 0.85
(Calculation example) 3.74
s when the module is mounted on the main base, the
number of settings is 1, and the number of X points is 16
Buffer memory read
(1) Main base
(a) 16 words or less:
Time = 0.47
(total number of transferred words) 2.85 (number of
settings)
0.95
(b) More than 16 words:
Time = 0.5
(total number of transferred words) 0.95
(2) Extension base
(a) 16 words or less:
Time = 1.07
(total number of transferred words) 2.85 (number of
settings)
0.95
(b) More than 16 words:
Time = 1.1
(total number of transferred words) 0.95
(Calculation example) 4.74
s when the module is mounted on the main base, the
number of settings is 1, and the number of words is 2
I49 overhead
41
s
High speed interrupt program
execution
Depends on the user-created interrupt program.
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