Mitsubishi Electric MELSEC IQ-R series Reference Manual page 457

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)
Communication time = Request message transmission time (T0) + [(T1 + (1.5 × scan time) + T2) or TW] + Response message transmission time (T4)
■When external device writes data to a programmable controller
Communication time = Request message transmission time (T0) + [(T1 + (1.5 × scan time) + T2 + T3 + T5) or TW] + Response message transmission time (T4)
1000
T0, T4 = × number of bits for 1 byte at transmission ( 1 + 7/8 + 0/1 + 1/2 ) × number of bytes
Transmission rate
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)
T2, T3 = CPU intervention time
: 0.07 to 13.1ms
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.
(When the value exceeds TW)
(When the value exceeds TW)
Start bit
Parity bit
Data length
(0 or 1)
(7 or 8)
: 12.0 to 45.0 ms
: 12.5 to 45.0 ms
: 13.0 to 70.0 ms
Stop bit
(1 or 2)
APPENDICES APPENDIX
Appendix 2 Processing Time
A
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