Omron SYSMAC CS1D-PD Series Operation Manual page 407

Computing the Cycle Time
Increase in Cycle Time Caused by Inner Board
9-4-4 Cycle Time Calculation Example
Conditions
Calculation Example
Name Model
Serial Com- CS1W-
munications SCB21-
Board V1/41-V1
The following example shows the method used to calculate the cycle time
when Basic I/O Units only are mounted to the PLC with a CS1D-CPU6@H.
Item
CPU Rack (8 slots)
Expansion Rack (8 slots) x
1 Unit
User program
Peripheral port connection Yes and no
Fixed cycle time process-
ing
RS-232C port connection
Peripheral servicing with
other devices (Special I/O
Units, CS-series CPU Bus
Units, Inner Boards, and
file access)
Process name
(1) Overseeing ---
0.04 µs × 2,500 + 0.04 µs
(2) Program execu-
× 2,500
tion
(3) Cycle time calcu- (Fixed cycle time not set) 0 ms
lation
0.02 ms × 8 + 0.02 ms ×
(4) I/O refreshing
8
(5) Peripheral servic- (Peripheral port con-
ing nected only)
Cycle time (1) + (2) + (3) + (4) + (5)
Increase
0.22 ms There will be an increase of up to the
following time when a protocol macro is
executed:
0.1 ms +maximum number of data
words sent or received (0 to 500 words)
x 0.7 µs
There will be an increase of the event
execution times when Host Links or 1:N
NT Links are used.
Details
CS1W-ID291 96-point Input Units
CS1W-OD291 96-point Output Units
CS1W-ID291 96-point Input Units
CS1W-OD291 96-point Output Units
5 Ksteps
No
No
No
Calculation
Programming
1.9 ms
0.2 ms
0.32 ms
0.1 ms
2.52 ms
Section 9-4
Remarks
4 Units
4 Units
4 Units
4 Units
LD instruction
2.5 Ksteps, OUT
instruction
2.5 Ksteps
Processing time
With Without
Programming
Device Device
1.9 ms
0.2 ms
0 ms
0.32 ms
0 ms
2.42 ms
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