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MELSEC-F
9 WHEN COMMUNICATING DATA USING THE MC PROTOCOL
9.2 List of Commands and Functions for The MC protocol
The following table lists the commands and functions when an external device
accesses the PLC.
–
Function
Command/response type
Processing
Number of points
processed per
communication
Bit units
00
H
Reads bit devices (X, Y, M, S, T, C) in 1-point units.
256 points
Reads bit devices (X, Y, M, S, T, C ) in 16-point units.
32 words (512 points)
Batch read
Word units
01
H
Reads word devices (D, R, T, C ) in 1-point units. ( 1) 64
points
Bit units
02
H
Writes to bit devices (X, Y, M, S, T, C ) in 1-point units.
160 points
Writes to bit devices (X, Y, M, S, T, C ) in 16-point units.
10 words (160 points)
Batch write
Word units
03
H
Writes to word devices (D, R, T, C ) in 1-point units.
64 points
Bit units
04
H
Sets/resets bit devices (X, Y, M, S, T, C) in 1-point units
by arbitrarily designating the devices and device number.
80 points
Sets/resets bit devices (X, Y, M, S, T, C) in 16-point units
by arbitrarily designating the devices and device number.
10 words (160 points)
Device
memory
Test
(Random write)
Word units
05
H
Sets/resets word devices (D, R, T, C) in 1-point units by
arbitrarily designating the devices and device numbers.
Not applicable for 32 bit devices from C200 to C255.
10 points
Remote RUN
13
H
Remote STOP
14
H
Requests the remote RUN/STOP to PLC.
PLC control
PLC model name read
15
H
Reads PLC model name code.
Loop test
16F
H
Returns the character received from the other node to
that node with the data as it is.
254 bytes
1 When the double word data is read using the user program, etc., read out the 32bit data at
once.
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