Appendix 3 Processing Time - Mitsubishi Electric QJ71MB91 User Manual

APPENDICES

Appendix 3 Processing Time

App
- 7 Appendix 3 Processing Time
This section explains the QJ71MB91 processing time for each function.
The processing times obtained by the expressions in this section can be regarded as the
times showing performance in communication with a single device.
(1) Performance of master functions
(a) Performance of the automatic communication function
1) Automatic communication function communication time [unit: ms]
The automatic communication function communication time is the time from
the start of request message processing to the end of response message
processing.
Tac=Km+Ta+Ktq+Ktr+Ts+Ti
2) Calculation items
TableApp.8 Processing time calculation items for the automatic communication function
Item
Tac
Km
Ta
Ktq
Ktr
Ts
Ti
Gt
* 1 Request message transmission time [ms]:
Ktq = Request message size [bytes]
* 2 Response message transmission time [ms]:
Ktr = Response message size [bytes]
* 3 1 character time = Bits of 1 character / Transmission speed [bps]
3+Gt
Description
Automatic communication function
communication time
9 (Constant)
Message conversion time
RTU mode : 0
ASCII mode: 1 to 2
Request message transmission time
Response message transmission time
Target slave device processing time
Message interval
RTU mode:
When the transmission speed is 19200 bps or
*3
less, "1 character time
When the transmission speed exceeds 19200
bps, "1.75ms"
ASCII mode: 0
Data transmission delay time
RS-232 : 0 ms
RS-422/485: 1 character time
Bits of 1 character / Transmission speed [bps]
Bits of 1 character / Transmission speed [bps]
*1
*2
3.5"
*3
2
1000
Unit
ms
-
ms
ms
ms
ms
ms
ms
1000
1000