Mitsubishi Electric MELSEC IQ-R series Reference Manual page 371

Monitor (bit units) (command: MB, MJ)
Monitor the registered bit devices (X, Y, M, etc.).
• The bit device memory registered with BM command is monitored using MB command.
• The bit device memory registered with JM command is monitored using MJ command.
■Request data
Message wait
Command
• Command
ACPU common
M B
4D 42
H H
• Message wait: Specify the delayed time of the response transmission. (Page 347 Message wait)
■Response data
Monitoring result ( For the
number of device points )
The value of read device is stored in bit units. (Page 74 Read data, write data)
■Communication example
Monitor bit devices specified with monitor data registration under the following conditions.
• Message wait: 0 ms
• Registered devices for monitoring: 3 points (3 bits) of contacts for X040, Y060 and T123.
(Request data)
• When using MB (ACPU common command)
Message wait
M B 0
4D 42 30
H H H
• When using MJ (AnA/AnUCPU common command)
Message wait
M J 0
4D 4A 30
H H H
(Response data)
Monitoring result ( For the number of device points )
1 0 1
31 30 31
H H H
(X040) (Y060) (Contact of T123)
AnA/AnUCPU common
M J
4D 4A
H H
17 COMMUNICATING USING 1C FRAMES
17.4 Device Memory Read and Write
17
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