Hakko Electronics Monitouch V Series, Reference Manual

Page: 719 / 746

Appendix 2 Process Cycle
A2-4
•
When considering the display speed of the screen, it is recommended to set
up a smaller slice level for a shorter scan time of the PLC, or a greater slice
level for a longer scan time.
♦
One-cycle Processing
The PLC memory set for [Read Area] in the [Comm. Parameter] dialog is read
first. Next, data in the memory set for the items on the screen is read and
drawn. When operations of all the setting data have been performed, the screen
display is completed. This series of operations is called “one cycle.”
Refer to the illustration below.
The “scan time” means the length of time from when the PLC starts operation of ladder
program from step 0 until it executes step 0 again.
n = 0
n = n + 1
n < 8
YES
YES
YES
NO
NO
NO
Reading from
the read area
Reading
high-speed
block 1
Reading
high-speed
block “m”
Reading
low-speed
block 1
1 cycle
Reading from
the read area
Reading
high-speed
block 1
Reading
high-speed
block “m”
Reading
low-speed
block 2
Reading from
the read area
Reading
high-speed
block 1
Reading
high-speed
block “m”
Reading
low-speed
block n
1 cycle 1 cycle
Cycle start
[Event Timer]
No. “n” present
[Event Timer] No. “n”
Timer up
[Event Timer]
No. “n” executed
1. PLC memory (screen setting) transfer
2. Transfer three words of read area to system
memory ($s460 and later)
Cycle macro execution
Read area “n” (RCVDAT) processing
Read area “n + 1” (SCRN_COM) processing
Read area “n +2” (SCRN_No) processing
High-speed block 1 processing
High-speed block 2 processing
High-speed block “m” processing
Low-speed block “n” processing
Cycle end
High-speed block 3 processing