Mitsubishi QJ71MB91 - Page 362

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