Mitsubishi Electronics fx3u 9.2 List of Commands and Functions for The MC protocol

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MELSEC-F
WHEN COMMUNICATING DATA USING THE MC PROTOCOL9
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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.
*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 00HReads bit devices (X, Y, M, S, T, C) in 1-point units. 256 points
Word units 01H
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 02HWrites to bit devices (X, Y, M, S, T, C ) in 1-point units. 160 points
Word units 03H
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)
Bit units 04H
Sets/resets bit devices (X, Y, M, S, T, C) in 1-point units
by arbitrarily designating the devices and device number. 80 points
Word units 05H
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)
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
PLC control
Remote RUN 13HRequests the remote RUN/STOP to PLC.
Remote STOP 14H
PLC model name read 15HReads PLC model name code.
Loop test 16H
Returns the character received from the other node to
that node with the data as it is. 254 bytes