Mitsubishi Electric MELSEC iQ-R Series - Page 457

APPENDICES APPENDIX
Appendix 2 Processing Time
455
A
Transmission time of transmission sequence
The following explains the approximate time required from when external device starts data transmission to when C24 returns
the result.
The average of the above approximate time is shown below for the estimation of the processing time.
■When external device reads data from a programmable controller (unit: ms)
■When external device writes data to a programmable controller
Communication time = Request message transmission time (T0) + [(T1 + (1.5 × scan time) + T2) or TW] + Response message transmission time (T4)
(When the value exceeds TW)
Communication time = Request message transmission time (T0) + [(T1 + (1.5 × scan time) + T2 + T3 + T5) or TW] + Response message transmission time (T4)
(When the value exceeds TW)
T0, T4 = × number of bits for 1 byte at transmission ( 1 + 7/8 + 0/1 + 1/2 ) × number of bytes
Stop bit
(1 or 2)
Start bit
Parity bit
(0 or 1)
Data length
(7 or 8)
T1 = C24 processing time
Depending on the access points (MIN to MAX), the following ranges.
RJ71C24(-R2/-R4)
QJ71C24N(-R2/-R4), LJ71C24(-R2)
QJ71C24(-R2)
: 12.0 to 45.0 ms
: 12.5 to 45.0 ms
: 13.0 to 70.0 ms
T2, T3 = CPU intervention time
T5 = Scan time (For functions that can process one scan, T3 and T5 equal 0.)
TW = The set time when message wait time is set.
1000
Transmission rate
:0.07to13.1ms