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11 HIGH PERFORMANCE MODEL QCPU PROCESSING TIME
11 HIGH PERFORMANCE MODEL QCPU PROCESSING TIME
This chapter describes how to estimate the length of High Performance model QCPU
processing time.
11.1 Reading High Performance model QCPU's Scan Time
The length of scan time is the total of the following times:
• I/O refresh time
• Instruction execution time
• END processing time
(1) I/O refresh time
(a) I/O refresh time is the total time required for refreshing I/O data of the
following modules:
• Input module
• Output module
• Intelligent function module (special function module)
(b) I/O refresh time is given in the formula:
(I/O refresh time) = (Number of inputs point/16) N1 + (Number of outputs point
/16) N2
(c) The table below shows N1 and N2.
N1
N2
CPU type
Q3 B
Q5 B
/Q6 B
QA1S B
Q3 B
Q5 B
/Q6 B
QA1S B
Q02CPU
2.2 s
2.9
s
4.3
s
1.3
s
2.1
s
3.5
s
Q02HCPU
Q06HCPU
Q12HCPU
Q25HCPU
1.7
s
2.4
s
3.7
s
1.3
s
2.1
s
3.5
s
(2) Instruction execution time
(a) Instruction execution time is the total processing time required to execute an
instruction in a program on the High Performance model QCPU.
For details on the execution time of each instruction, see the QCPU (Q
Mode)/QnACPU Programming Manual (Common Instructions).
(b) Overhead time is required for an interrupt program/fixed scan execution
type program. Add overhead time to execution time.
(3) END processing time
(a) END processing time is the High Performance model QCPU processing
time common to the above-listed items (1) and (2).
(b) The table below shows the length of END processing time.
CPU Type
END Processing Time
Q02CPU
0.38 ms
Q02HCPU, Q06HCPU, Q12HCPU, Q25HCPU
0.15 ms
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Содержание QCPU (Q Mode)
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