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CHAPTER6 FUNCTIONS
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6.22 High Speed Interrupt Function
6.22.3 Processing time
6.22.3Processing time
The following shows each processing time during the period from the start to the end of the high speed interrupt
function.
(To the next page)
Figure 6.90 The start-to-end high speed interrupt function processing
Table6.36 Processing times related to the high speed I/O refresh and high speed buffer transfer
Item Processing time
Waiting time
Up to 37.5 s (More than 37.5 s may be required to process some of instructions.)
Up to 40 s when any of CC-Link IE Controller Network modules, MELSECNET/H modules, CC-
Link modules, and intelligent function modules are mounted on an extension base unit.
High speed interrupt start+High
speed interrupt end
22 s
X input
Main base unit: Time=0.14 (total of points)+0.65 (number of settings)+0.85
Extension base unit: Time=0.21 (total of points)+0.65 (number of settings)+0.85
(Calculation example) When a main base unit is used, the number of settings is 1, and 16 points
are set for X, the time is 3.74 s.
Buffer memory reading
Main base unit:
• 16 words or less ••• Time=0.47 (total number of transferred words)+2.85 (number of
settings)+0.95
• More than 16 words••• Time=0.5 (total number of transferred words)+0.95
Extension base unit:
• 16 words or less••• Time=1.07 (total number of transferred words)+2.85 (number of
settings)+0.95
• More than 16 words ••• Time=1.1 (total number of transferred words)+0.95
(Calculation example) When a main base unit is used, the number of settings is 1, and two words
are to be transferred, the time is 4.74 s.
I49 overhead
41 s
High speed interrupt program
execution
Depends on the user-created interrupt program.
Main routine program
Waiting time
High speed interrupt start
Input (X)
Buffer memory reading
I49 overhead
High speed interrupt
program execution
Buffer memory writing
Output (Y)
High speed interrupt end
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