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31
Data Transfer
Input and output data is transferred during the I/O refresh cycle. This means
that PC acknowledgement of inputs from the Counter Unit (e.g., status) and
Counter Unit acknowledgement of outputs from the PC (e.g., commands) are
delayed until the next I/O refresh cycle, as shown below.
Cycle time
Cycle time
Cycle time
Cycle time
Cycle time
I/O
refresh cycle
I/O
refresh cycle
I/O
refresh cycle
I/O
refresh cycle
I/O
refresh cycle
START and oth-
er outputs
Counting flag
and other inputs
START and oth-
er outputs
Counting flag
and other inputs
C200H
Counter
Unit
Data transfer would enter into the cycle time as shown below:
Cycle time
Cycle time
Cycle time
I/O
refresh cycle
Data transfer
Transfer com-
pleted flag
Internal process-
ing
Transfer com-
pleted flag
C200H
Counter
Unit
I/O
refresh cycle
I/O
refresh cycle
Data transfer acknowledged. Data transfer executed.
Note:
The transfer completed flag reverses status (ON to OFF
or OFF to ON) each time a transfer is completed.
When the Counter Unit is mounted on a Rack containing a Remote I/O Slave
Unit, a delay will occur due to data transfer between the Remote I/O Master
Unit and the Remote I/O Slave Unit. See the C200H Programming Manual
for details.
Data Transfer in Remote I/O
Systems
Data Transfer Timing
Section 3-4
Summary of Contents for SYSMAC C200H-CT001-V1
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