Mitsubishi Electric FX3U-ENET User Manual page 182

9 WHEN COMMUNICATING DATA USING THE MC PROTOCOL
(Data name)
External
*
device side
L
(Example)
01 FF 0A
H H
(Data name)
PLC side
(Example)
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NOTE
C200 to C255 (Current Values) Batch Read
Since C200 to C255 are 32 bit devices, the device points should be specified as
twice as much as the points actually read.
Also, make sure that the device points are specified by an even number.
If they are specified by an odd number, the batch read cannot be performed. (Error
code 57 will be stored)
H
Example) When 32 devices are read at one access from C220 to C251 in the PLC
on which the Ethernet module is mounted.
(1) When communicating in binary code
Head device
L - - - - H
H
00 DC 00 00 00 4E 43
H H H H H H H H
CN220
32 points x 2 = 64 word
40 00
H H
Low
*
16bit
L - H
81 00 4E
H H H
12345678=00BC614E
MELSEC-F
4 bytes x 32=128 bytes
Head data Last data
High Low
16bit 16bit
L - H L - H
61 BC 00 40 01
H H H H H
45678912=02B90140
H
High
16bit
L - H
B9 02
H H
H
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