Cycle Time and Time Section 9-2
190
I/O Refresh Time for Typical
Special I/O Units
I/O refresh time is calculated statically. For Units with variable I/O refresh time
depending on the status, typical values are used. (e.g. The I/O refresh time
for the Position Control Unit (C200H-NC413) is 2.2 ms.)
Type Unit name Model I/O refresh time per 1
Unit
Temperature Control Unit C200H-TC@@@ 2.6 ms
ASCII Unit C200H-ASC02 1.8 ms
Analog Input Unit C200H-AD001 1.0 ms
C200H-CT001-V1High-speed Counter Unit
C200H-CT002
2.4 ms
C200H-NC111
C200H-NC112
2.2 ms
(4.0 ms when read)
Position Control Unit
C200H-NC413 4.3 ms
(5.5 ms when read/write)
C200H Special I/O Unit
PLC Link Unit C200H-LK401 0.3 ms
CS/CJ-series Special I/O Unit Analog I/O Unit CS1W-MAD44 0.2 ms
Calculating Cycle Time An example of calculating the cycle time when only Basic I/O Units are
mounted.
Condition
Item Contents
96-point Input Unit CS1W-ID291 4 UnitsCPU Rack (for 8 slots)
96-point Output Unit CS1W-OD291 4 Units
96-point Input Unit CS1W-ID291 4 UnitsCS/CJ-series Expansion
Rack (for 8 slots) ´ 1Unit
96-point Output Unit CS1W-OD291 4 Units
User program 5 k steps LD 2.5 k steps, OUT 2.5 k steps
Minimum Cycle Time Proc-
ess
None
Peripheral servicing with
other Units (Special I/O Unit,
CPU Bus Unit, Inner Board,
and file access)
None
Calculation example
Process name Calculation example Processing
time
(1) Overseeing processing - 0.5 ms
(2) Computing process 0.04 ms ´ 2500 + 0.17 ms ´ 2500
(The actual computing time var-
ies depending on execute/non-
execute.)
(0.53 ms)
(3) Calculating for Mini-
mum Cycle Time
(Minimum Cycle Time disabled) 0 ms
(4) I/O refresh 0.02 ms ´ 8 + 0.02 ms ´ 8 0.32 ms
(5) Peripheral servicing - 0 ms
Cycle time (1) + (2) + (3) + (4) + (5) 1.35 ms
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