Omron C200HE ユーザーズマニュアル

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.

X

Input on #0

Output on #31

Cycle time

Input 
signal

Output
signal

I/O refresh

I/O refresh

I/O response time

CPU Unit reads

input signal

CPU Unit writes

output signal

Output ON delay

Input ON delay

Host link service

Buffer for Host
Link Unit # 0

Cycle time

Buffer for Host
Link Unit # 31

PC for Host
Link Unit # 31

PC for Host
Link Unit # 0

Host computer

Host computer
processing time

Command

Command

Response

Response

Command/response for Unit # 0

Command/response for Unit # 31

Host link service

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.

Minimum response time =

Input ON delay + Command transmission time + (Cycle time of PC for Unit #0 

×

 3) + Response transmis-

sion time + Host computer processing time + Command transmission time + (Cycle time of PC for Unit #31

×

 3) + Output ON delay

Maximum response time =

Input ON delay + Command transmission time + (Cycle time of PC for Unit #0 

×

 10) + Response transmis-

sion time + Host computer processing time + Command transmission time + (Cycle time of PC for Unit #31

×

 10) + Output ON delay

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.