Mitsubishi MELSEC-F User Manual page 186

9 WHEN COMMUNICATING DATA USING THE MC PROTOCOL
(Data name)
External
*
device side
(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 251 in the PLC on
which the Ethernet module is mounted.
(1) When communicating in binary code
Head device
L - - - -
L H
00 DC 00 00 00 4E 43
H H H H H H H
CN220
32 points x 2 = 64 word
H
40 00
H H H
*
81 00
H
12345678=00BC614E
4 bites x 32=128 bytes
Head data
Low High
16bit 16bit
L - H L - H
4E 61 BC 00
H H H H H
45678912=02B90140
H
MELSEC-F
Last data
Low High
16bit 16bit
L - H L - H
40 01 B9 02
H H H H
H
9 - 27