Mitsubishi Electric MELSEC IQ-R series Reference Manual page 369

Register monitor data (bit units) (command: BM, JM)
Set the bit devices (X, Y, M, etc.) to be monitored in 1-point units.
Monitor the device memory registered in bit units using the following command.
Page 369 Monitor (bit units) (command: MB, MJ)
■Request data
Number of
Command Message wait device points
(n points)
• Command
ACPU common AnA/AnUCPU
common
B M
J
42 4D
4A
H H H
• Message wait: Specify the delayed time of the response transmission. (Page 347 Message wait)
• Number of device points: Convert the numerical value to 2-digit ASCII code (hexadecimal), and send it from the upper
digits.
• Device: Specify the devices to be monitored. (Page 351 Device codes, device numbers)
Specify the number of device points within the following range:
1  Number of device points  40
When using the BM command and accessing ACPU other than AnA/AnU, device X (input) has two processing
points per point.
■Response data
There is no response data for this command.
■Communication example (Monitor data registration in bit units)
Perform monitor data registration of the bit device under the following conditions.
• Message wait: 0 ms
• Number of device points: 3 points (3 bits)
• Device: Contacts of X40, Y060, and T123.
(Request data)
• When using BM (ACPU common command)
Message wait
Number of
Device
device points
B M 0 0 3 X 0
42 4D 30 30 33 58 30
H H H H H H H
• When using JM (AnA/AnUCPU common command)
Message wait
Number of
device points
J M 0 0 3 X 0
4A 4D 30 30 33 58 30
H H H H H H H
Device
(first point)
M
4D
H
Device
0 4 0 Y 0 0 6 0
35 34 30 59 30 30 36 30
H H H H H H H
Device
0 0 0 4 0 Y 0 0
30 30 30 34 30 59 30 30
H H H H H H H
Device
(nth point)
Device
T S 1 2 3
54 53 31 32 33
H H H H H H
Device Device
0 0 6 0 T S 0
30 30 36 30 54 53 30
H H H H H H H H
17 COMMUNICATING USING 1C FRAMES
17.4 Device Memory Read and Write
0 1 2 3
30 31 32 33
H H H H
17
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