User`s manual

358
CHAPTER 16 USING COMMUNICATION DATA
MONITORING FUNCTION
The following describes the QJ71C24N (-R2/R4) and LJ71C24(-R2) communication data monitoring functions.
16.1 Communication Data Monitoring Function
16.1.1 Overview
Communication data monitoring function is a function to monitor communication data between the QJ71C24N (-
R2/R4) or LJ71C24(-R2) and an external device on communication lines.
The system startup time can be reduced by analyzing the communication data on the communication lines when
debugging the system.
The following two methods are for the communication data monitoring.
(1) Communication data monitoring by the sequence program (Explained in this
section)
Monitoring is performed by the monitor start instruction written in the communication data monitoring specification
area of the buffer memory.
(2) Communication data monitoring by GX Configurator-SC
The debugging support function of the GX Configurator-SC protocol FB support in used for monitoring (circuit
trace).
See the Operating Manual (Protocol FB support function) for the debugging support function of the GX
Configurator-SC protocol FB support.
This section describes the communication data monitoring by the sequence program.