Mitsubishi Electric MELSEC IQ-R series Reference Manual page 418

Monitor in bit units (command: 08)
Monitor the bit devices for which monitor data is registered.
■Request data
There is no request data for this command.
■Response data
The value of the read device is stored in byte units.
The order of data differs depending on the ASCII code or binary code.
If the number of device points registered to be monitored is an odd number, dummy data 0 (30H) is added
when the monitoring is executed. For example, if the number of device points registered to be monitored is
three points, data for four points is returned. The last byte will be a dummy data.
■Communication example
Monitor the devices registered with monitor data registration in the CPU module with E71 mounted under the following
conditions.
• Number of registered device points: 3 points
• Number of registered device numbers: Y46, M12, B2C
(Response data)
(ASCII code)
End code Data for the number of specified device points
Subheader
8 8 0 0 1
38 38 30 30 31
H H H H H
(Y46)
(Binary code)
Subheader End code
88 00 10 10
H H H
1 0 1
(Y46) (B2C)
(M12)
18 COMMUNICATING USING 1E FRAMES
416
18.4 Read and Write Device Memory
0 1 0
30 31 30
H H H
(B2C)
(M12) Dummy data
Data for the number of specified device points
H
0
Dummy data