68
4-10-5 Transfer Time
The calculation of transmission time with the IORD instruction is complicated
and varies with the PC model, ladder program, and the status of the MC Unit.
Refer to the following example of transmission time with the C200HX as a refer-
ence value.
Cycle time: 2.5 ms
Status of MC Unit: 1 task with 2 axes that are servo-locked.
No. of position data items Transmission time (ms)
1 1.2
6 1.9
20 4.2
42 7.3
Note The IORD instruction transfers all data while the IORD instruction is being
executed. In the above example, the ladder scan time will increase according to
the above table.
Adjust the time to monitor the cycle time if necessary.
IORD Instruction
Section 4-10
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