Omron C200HX Operation Manual page 402

I/O Response Time
6-4-3 Host Link Systems
Host computer
Buffer for Host
CPU Unit reads
Link Unit # 0
input signal
PC for Host
Link Unit # 0
Buffer for Host
Link Unit # 31
PC for Host
Link Unit # 31
Input
signal
Output
signal
Input ON delay + Command transmission time + (Cycle time of PC for Unit #0 × 3) + Response transmis-
Minimum response time =
sion time + Host computer processing time + Command transmission time + (Cycle time of PC for Unit #31
× 3) + Output ON delay
Input ON delay + Command transmission time + (Cycle time of PC for Unit #0 × 10) + Response transmis-
Maximum response time =
sion time + Host computer processing time + Command transmission time + (Cycle time of PC for Unit #31
× 10) + Output ON delay
6-4-4 PC Link Systems
384
The following diagram illustrates the processing that takes place when an input
on one PC is transferred through the Host Link System to turn ON an output on
another PC. Refer to Host Link System documentation for further details.
Command/response for Unit # 0
Command
Response
Cycle time
I/O refresh
Input ON delay
The equations used to calculate the minimum and maximum cycle times are giv-
en below. The number of cycles required for each PC depends on the amount of
data being read/written.
The processing that determines and the methods for calculating maximum and
minimum response times from input to output are provided in this subsection.
The following System and I/O program steps will be used in all examples below.
This System contains eight PC Link Units.
Output on #31
Input on #0
Command/response for Unit # 31
Command
Host computer
processing time
Host link service
Cycle time
Host link service
I/O response time
Section 6-4
X
Response
CPU Unit writes
output signal
I/O refresh
Output ON delay