Appendix 4.3 Processing Time Of Dedicated Instructions; Appendix 4.3 - Mitsubishi Electric MELSEC-Q Series User Manual

Appendix 4.3

This section describes the processing time of dedicated instructions (time between an instruction issued and a
response received).
(1) Master station ↔ local station
(a) Master station  local station
The time between the master station issuing an instruction and it receiving a response from a local station is
calculated as follows.
[Formula]
<Maximum value>
• G(P).RIRD instruction
OT + LS × [BC + {(number of read points + 16) 16}
+ (WT × RT × 1000)
OT: Processing time of QCPU dedicated instructions
Basic model QCPU, Q02CPU: 1ms
QCPU (excluding a Basic model QCPU and Q02CPU): 0.5ms
LS:
Link scan time (
BC: Constant
Transmission
speed
BC
SL: Local station sequence scan time (Apply "0" when buffer memory data in CC-Link is read.)
WT:
Monitoring time set in SW0009 (
RT:
Number of retries set in SW000B (
When the CPU module is a Q06HCPU, transmission speed is 10Mbps, link scan time is 5ms, the number
Ex.
of read points is 20 words (buffer memory in CC-Link), monitoring time is 10 seconds, and the retry is not
set
OT + LS × [BC + {(number of read points + 16)  16}
= 0.5 + 5 × [12 + {(20 + 16)  16}
= 0.5 + 5 × [12 + {3 × 1.067}] + 0
= 76.505
= 76.5ms
*1 The decimal point is rounded up.
*2 Time that occurs when a dedicated instruction is retried
Processing time of dedicated instructions
*2
ms
Page 366, Appendix 4.1)
156kbps 625kbps
6 7
*1
× 1.067] + 0 + (10 × 0 × 1000)
*1
× 1.067] + SL
2.5Mbps 5Mbps
9
Page 351, Appendix 3.2)
Page 351, Appendix 3.2)
*1
× 1.067] + SL + (WT × RT × 1000)
APPENDICES
10Mbps
11 12
381
A