Mitsubishi Q Series Programming Guide

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3 SPECIFICATIONS
MELSEC-Q
3.3 Processing Time
3.3.1 Processing time for SFC program
The time required to process the SFC program is discussed below.
(1) Method for calculating the SFC program processing time
Calculate the SFC program processing time with the following expression
SFC program processing time
(A) + (B) + (C)
(a) "(A): Processing time of operation outputs in all blocks"
Indicates the total sum of the processing times of the instructions used for the operation
outputs of all steps that are active.
For the processing times of the instructions, refer to the QCPU (Q mode)/QnACPU
Programming Manual (Common Instructions).
(b) "(B): Processing time of all transition conditions"
Indicates the total sum of the processing times of the instructions used for the transition
conditions associated with all steps that are active.
For the processing times of the instructions, refer to the QCPU (Q mode)/QnACPU
Programming Manual (Common Instructions).
(c) "(C)" SFC system processing time"
Calculate the SFC system processing time with the following expression.
SFC system processing time
(a) + (b) + (c) + (d) + (e) + (f) + (g)
Processing Time Calculation of Processing Time (Unit: µs)
(a) Active block
processing
time
(Active block processing time) (active block processing time coefficient) (number of active blocks)
• Active block processing time: System processing time required to execute active blocks
• Number of active blocks: Number of blocks that are active
(b) Inactive block
processing
time
(Inactive block processing time) (inactive block processing time coefficient) (number of inactive blocks)
• Inactive block processing time: System processing time required to execute inactive blocks
• Number of inactive blocks: Number of blocks that are inactive
(c) Nonexistent
block
processing
time
(Nonexistent block processing time) (nonexistent block processing time coefficient) (number of
nonexistent blocks)
• Nonexistent block processing time: System processing time required to execute blocks that have not
been created
• Number of nonexistent blocks: Number of blocks where programs have not been created within the
number of blocks set in the parameter
(d) Active step
processing
time
(Active step processing time) (active step processing time coefficient) (number of active steps)
• Active step processing time: Time required to execute active steps
• Number of active steps: Number of steps that are active in all blocks
(e) Active
transition
processing
time
(Active transition processing time) (active transition processing time coefficient) (number of active
transitions)
• Active transition processing time: System processing time required to execute active transitions
• Number of active transitions: Number of transition conditions associated with all steps that are active
in all blocks
(f) Transition
condition-
satisfied step
processing
time
(Transition condition-satisfied step processing time) (transition condition-satisfied step processing
time coefficient)
(number of transition condition-satisfied steps)
• Transition condition-satisfied step processing time: Time required to perform OFF execution of active
steps
• Number of transition condition-satisfied steps: Number of steps where operation outputs are turned
OFF since transition conditions were satisfied in all blocks
(g) SFC end
processing
time
(SFC end processing time) (SFC end processing time)
• SFC end processing time: System processing time required to perform the end processing of SFC
program.

Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English