Mitsubishi Electric QJ71MB91 User Manual page 363

APPENDICES
(2) Performance of the slave function
(QJ71MB91)
Request
Master
message
Slave
Ti Ttq
FigureApp.2 Processing time configuration of the slave function
(a) When mounted with a programmable controller CPU
1) Request message processing time [unit: ms]
The request message processing time is the time from when the QJ71MB91
receives a request message from the master until it sends a response
message after completion of the requested processing.
Tsl = Ttq + Ta + Ks1 + Ks2
2) Calculation items
TableApp.10 Processing time calculation items used when mounted with a programmable
Item
Request message processing time
Tsl
Local station scan time
St
6 (Constant)
Ks1
8 (Constant)
Ks2
Message conversion time
RTU mode
Ta
ASCII mode : 1 to 2
Ttq
Request message transmission time
Ttr
Response message transmission time
Message interval
RTU mode:
When the transmission speed is 19200 bps or less, "1
Ti
character time
When the transmission speed exceeds 19200 bps, "1.75ms"
ASCII mode: 0
Data transmission delay time
RS-232
Gt
RS-422/485: 1 character time
Request
Processing
message
time
QJ71MB91+CPU
Processing time
(Ta+Ks1+Ks2 n1+St n2)
Ti Gt
Tsl
n1 + St n2 +Ttr + Ti
controller CPU
Description
: 0
*1
*3
3.5"
: 0 ms
*3
2
Appendix 3 Processing Time
Response
message
Ttr
Ti
2 + Gt
Unit
*2
(Continued on next page)
App
9
10
11
ms
ms
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-
ms
ms
ms
ms
ms
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