Monitor Extended File Registers (Command: 1A, 1B) - Mitsubishi Electric MELSEC IQ-R series Reference Manual

Monitor extended file registers (command: 1A, 1B)

The contents of extended file registers in the CPU module can be monitored from an external device by registering the block
numbers and device numbers to be monitored to E71 in advance and executing the monitor command from the external
device.
When reading extended file register in batch, the read device numbers will be consecutive. However, when reading them
using the monitor command, the extended file registers can be read randomly by specifying the file registers of arbitrary block
numbers and device numbers.
Procedure for monitoring
1.
Register block numbers and device numbers of the extended file registers to be monitored to E71 by monitor data
registration.
2.
Execute read processing by monitoring.
3.
Process the data.
4.
If do not change the devices to be monitored, return to step 2, and repeat the process.
• When monitoring data as the procedure shown above, the monitor data registration is required. If monitoring
data without registering the data, an error occurs (END code: 57H).
• The content of registered monitor data is deleted when turning the power OFF or the resetting the CPU
module.
• There are three types of commands for monitor data registration; extended file register, device memory bit
unit, and device memory word unit. The recently registered one command out of three types of commands
can be registered to E71.
• When registering device memory of the CPU module as a monitoring data from more than one external
devices on the same station, the recently registered device memory will be available since the registration
data is overwritten.
18 COMMUNICATING USING 1E FRAMES
18.5 Read and Write Extended File Register
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