Processing Time; Processing Time For Sfc Program - Mitsubishi Electric MELSEC-Q Series Programming Manual

3.3

Processing Time

This section describes the processing time for SFC programs.

Processing time for SFC program

Calculate the SFC program processing time with the following expression
• Processing time for SFC program = (A) + (B) + (C)
Item
(A) Processing time of operation
outputs in all steps
(B) Processing time of all transition
conditions
(C) SFC system processing time
Processing time of operation outputs in all steps
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 time of the instructions, refer to the Programming Manual (Common Instructions) for the CPU module
used.
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 time of the instructions, refer to the Programming Manual (Common Instructions) for the
CPU module used.
SFC system processing time
Calculate the SFC system processing time with the following expression.
• SFC system processing time (C) = (a) + (b) + (c) + (d) + (e) + (f) + (g)
Item
(a) Active block processing time
(b) Inactive block processing time
(c) Nonexistent block processing
time
(d) Active step processing time
(e) Active transition processing time
(f) Transition condition-satisfied step
processing time
(g) SFC end processing time
3 SPECIFICATIONS
30
3.3 Processing Time
Description
Total sum of the processing times of the instructions used for the operation outputs of all steps that are active
Total sum of the processing times of the instructions used for the transition conditions associated with all steps
that are active
Total sum of the processing times described in Page 30 SFC system processing time.
Calculation of Processing Time (Unit: s)
(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
(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
(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
(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
(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
(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
(SFC end processing time) = (SFC end processing time)
• SFC end processing time: System processing time required to perform the end processing of SFC program.