Note
1.
The width of a pulse of counter input Z and that of external control input
IN1 must be 0.1 ms min.
2.
When the High-speed Counter Unit in counter reset operation uses
counter input Z or external control input IN1, the input repetition frequency
of counter input Z or external control input IN1 must be 500 cps max.
4-11 Data Processing with PC
This section provides the data transfer timing of the High-speed Counter Unit
and the execution cycle of the PC.
Execution Cycle of PC
The PC processes the following within a cycle time.
Data Exchange with PC
The High-speed Counter Unit exchanges I/O area information with the PC
with every I/O refresh.
The data transfer completion bit will be turned ON or OFF whenever data is
transferred.
External control input IN1
10
11
Input
Counter reset condition and timing
(E)
Reset
(E)
(E)
Reset
(E)
Cycle time
Com-
mon
proces-
sing
Host
link
service
Periph-
eral de-
vice
service
Arithmetic operation
I/O
refresh
Cycle time
Host
link
service
Periph-
eral de-
vice
service
Arithmetic operation
I/O
refresh
Com-
mon
proces-
sing
Cycle time
Cycle time
Cycle time
Cycle time
Cycle time
At PC
Starts, etc.
Operation, etc.
At High-speed
Counter Unit
Starts, etc.
Operation, etc.
I/O
re-
fresh
I/O
re-
fresh
I/O
re-
fresh
I/O
re-
fresh
I/O
re-
fresh
Cycle time
Cycle time
Cycle time
I/O
refresh
At PC
At High-speed
Counter Unit
Data transfer
Data transfer
completion
Data transfer
request accepted
Data being
transferred
Data transfer
completion
Internal
processing
I/O
refresh
I/O
refresh
Summary of Contents for C200H-CT021
Page 1: ...C200H CT021 High speed Counter Unit Operation Manual Revised December 2000 ...
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Page 4: ...vi ...