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