370
It is assumed that the program contains 5,000 instructions requiring an average
of 0.156
μ
s each to execute, and that nothing is connected to the RS-232C port
and no SYSMAC NET/SYSMAC LINK Unit is mounted.
Computer
Slave Rack
Host Link Unit
Remote I/O
Master Unit
CPU Rack
8-point
Input Units
8-point
Output Units
12-point
Output Units
16-point
Input Units
Calculations
The equation for the cycle time is as follows:
Cycle time =
Overseeing time + Program execution time
+ I/O refreshing time + Host Link Unit servicing time
+ Peripheral device servicing time
Process
Calculation
With Peripheral
Device
Without
Peripheral Device
Overseeing
Fixed
0.7 ms
0.7 ms
Program execution
0.156
μ
s/instruction
×
5,000 instructions
0.78 ms
0.78 ms
I/O refresh
See below.
2.58 ms
2.58 ms
Host Link servicing
Fixed
6.0 ms
6.0 ms
Peripheral device
servicing
0.7 + 0.78 + 2.58 +
6 = 10.06
10.06
×
0.05 = 0.50
0.50 ms
0.0 ms
Cycle time
Total of above
10.56 ms
10.06 ms
The I/O refreshing time would be as follows for three 8-point Input Units and
three 8-point Output Units mounted in the CPU Rack, and eight Units mounted in
a Slave Rack.
+ 1.1 ms + 8 Units
×
0.17 ms = 2.58 ms
8 pts
(8 pts
×
3) + (8 pts
×
3)
×
20
μ
s
Calculating Cycle Time
Section 6-2
Summary of Contents for SYSMAC C200HE
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