Mitsubishi Electric Q80BD-J61BT11N, User Manual

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App - 44 App - 44
MELSEC
APPENDIX
Appendix 3.3 Transient transmission processing time
This indicates the transient transmission processing time (the time required to execute
an instruction and receive the processing result).
POINT
The own station access processing time by the md function varies depending on
the performance of the personal computer, load status and other factors. The
following shows an example of the processing time for a personal computer with
Pentium II (233MHz).
Own station access processing time (personal computer with Pentium II (233MHz))
Access size
md function
2 bytes 512 bytes 1024 bytes
Batch read (mdReceive) 0.3ms 0.7ms 1.2ms
Batch write (mdSend) 0.3ms 0.4ms 0.5ms
(1) Master station (CC-Link Ver.2 board) local station
(programmable controller)
(a) Master station (CC-Link Ver.2 board) Local station
(programmable controller)
The following formula indicates the time taken from instruction execution at
the master station (CC-Link Ver.2 board) to receive processing result from
the local station (programmable controller).
[Formula]
[Maximum value]
1) Read
LS [BC + {(Read 16)/16}
1
1.067] + SL [ms]
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.