Mitsubishi Electric Q80BD-J61BT11N, User Manual

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App - 45 App - 45
MELSEC
APPENDIX
2) Write
OT + LS [BC + {(Write 16)/72}
1
1.067] + SL [ms]
OT: Data transmission time between the personal computer and the
CC-Link Ver.2 board.
The processing time varies depending on the performance of the
personal computer, load status, and other factors. The following
table shows an example of the processing time for a personal
computer with a Pentium II (233MHz).
Access size
md function
2 bytes 512 bytes 1024 bytes
Batch read (mdReceive) 0.4ms 0.8ms 1.3ms
Batch write (mdSend) 0.4ms 0.5ms 0.6ms
LS: Link scan time (Refer to Appendix 3.1.)
BC: Constant
Transmission speed 156kbps 625kbps 2.5Mbps 5Mbps 10Mbps
BC 6 7 9 11 12
SL: Local station's sequence program scan time
1: Round up decimals.
POINT
When performing a transient transmission using the md functions, the transient
transmission is executed in several runs by dividing the number of request data into
sizes inside the md functions that can be received by the opposite station. In
addition, after the communication line is opened, the first md function performs
extra transient transmission in order to obtain detailed information of the
programmable controller.