Program Example For Alarm Acquisition; Program Example For Time Control Over Dp-Slaves - Mitsubishi Electric Melsec Q Series User Manual

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PROGRAMMING

7.9.5 Program example for alarm acquisition

If a system switching occurs, the function of the alarm acquisition cannot be continued.
In redundant systems, do not use the alarm acquisition.
To use the function, pay attention to the this section and fully examine the possible
operations in advance.
(1) After the system switching
After the system switching, only the alarms that is newly generated after the switching
can be obtained.
When system switching occurs in the redundant system, the alarms that have been
obtained before the system switching cannot be read out in the new control system.

7.9.6 Program example for time control over DP-Slaves

If a system switching occurs during execution of the time control function, the processing
cannot be continued.
The following explains a program example for reexecuting the time control function after
system switching.
(1) Request and response formats
For the request and response formats used for the time control over DP-Slaves, refer
to Sections 7.6.1 to 7.6.3.
(2) Program example
(a) Settings
(b) Device assignments in program example
Device
X27 Time control execution command
The setting is the same as in Section 7.6.4 (1).
1) Devices used by the QJ71PB92V
The devices are the same as in Section 7.6.4 (2).
2) Devices used by the user
Table7.76 List of User Devices
Description
3) Devices used as automatic refresh or buffer memory read target
The device assignment is the same as that in Section 7.6.4 (2).
7.9 Program Examples for Use in the Redundant System
7.9.5 Program example for alarm acquisition
Device
ON for 1 scan only after switching system from
SM1518
standby to control
Description
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