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PC Link polling time: 30 ms
Induction sequence processing time: 120 ms
In a Multilevel PC Link System, the time required for the output may be
delayed one more scan at both Unit 0 and Unit 7. This is because PC Link
servicing is split into two parts in the PC scan, only one of which may be
serviced during any one scan depending on the time required for program
execution. Refer to the C1000H/C2000H Operation Manual for details.
C200H, C200HS, and C200HX/HG/HE(-Z) PCs
The following illustrates the data flow that will produce the minimum re-
sponse time, i.e., the time that results when all signals and data transmis-
sions are processed as soon as they occur.
PC with
Unit 0
Buffer in Unit 0
PC Link Unit trans-
missions
Buffer in Unit 7
Input
Output
Minimum transmission time
Program
executed.
Scan time
Scan time
I/O refresh
Program executed.
PC with
Unit 7
I/O refresh
The equation for minimum I/O response time is thus as follows:
Response time = input ON delay + scan time of PC of Unit 0 + minimum
transmission time + (scan time of PC of Unit 7 x 2) + output
ON delay
Inserting the following values into this equation produces a minimum I/O re-
sponse time of 149.3 ms.
Input ON delay 1.5 ms
Output ON delay 15 ms
Scan time for PC of Unit 0 20 ms
Scan time for PC of Unit 7 50 ms
Minimum Response Time
Response Times Section 6-1