User`s manual

35
CHAPTER 2 USING THE PROGRAMMABLE CONTROLLER CPU MONITORING FUNCTION
2
2.1 Overview
(2) Simplifying the device monitoring procedure
When device monitoring is performed by communication using the MC protocol, the external device must
repeatedly perform monitor request transmission and monitor data reception processing after it executes monitor
registration.
By designating the constant cycle transmission for the programmable controller CPU monitoring function, the
device data can be monitored without performing the monitor request reception processing.
(3) Notification of an error in the programmable controller CPU
In the condition agreement transmission and notification, error information can be sent to the external device
without a sequence program whenever a programmable controller CPU error occurs.
MODE
RUN
ERR.
USER
BAT.
BOOT
POWER
MELSEC
PULL
MITSUBISHI
Q25HCPU QJ71C24
CH1.
CH1.
CH2.
RS-232
USB
RS-232
Monitoring device
information
CPU error
information
External device
Abnormal detection
Error
occurrence