When Using Transmission/Reception Buffer - Mitsubishi MELSEC AJ65BT-R2 User Manual

3 SPECIFICATIONS

3.9.2 When using transmission/reception buffer

Details
When the master station
is the A/QnA Series
When the master station
is the Q Series
The transmission time is the time from when the transmission data is stored in the R2,
the transmission request (RYn0) is turned ON to when the transmission normal
complete (RXn0) is turned ON by the R2.
The reception time is the time from when the R2 starts receiving the data, the reception
normal read request (RXn2) and reception error read request (RXn3) are turned ON by
the R2, to when the data is received.
(1) Calculation expression
Transmission time
Reception time
Transmission time
Reception time
SM : Master station sequence program's scan time
LS : Link scan time (Refer to Master Module User's Manual)
RS : R2 internal processing time (Refer to section 3.8 (1))
*1 Data transmission (reception) time
This time is obtained with the data size and RS-232-C transmission speed.
(Example) Data size: 200 bytes, transmission speed: 9600bps (data bit length:
8, stop bit length: 1, parity bit: even)
200 × 10/9600 = 0.208s
*2 Transient transmission time
During transmission, this is the time for the data to be written from the master
station to the R2.
During reception, this is the time for reading the data from the R2 to the master
station.
Refer to section 5.4.3 in the Q Series Master Module User's Manual for the
calculation expressions.
Calculation expression (unit: ms)
×
SM + 2 + LS 6 + RS + data transmission time *
2
transmission time*
×
SM + LS 3 + RS + data reception time *
2
time*
×
SM + 2 + LS 4 + RS + data transmission time *
2
transmission time*
×
SM + LS 2 + RS + data reception time *
2
time*
3 - 23
MELSEC-A
1
+ transient
1
+ transient transmission
1
+ transient
1
+ transient transmission