Mitsubishi MELSEC-Q Series User Manual page 232

6 FUNCTIONS
6 - 30
4) Update before logging.
• When this setting is valid, tag collection is executed before logging,
regardless of the settings of the above 1) to 3).
• Set this item when it is desired to execute tag collection in
synchronization with logging.
1 Regardless of this setting, tag collection is performed when the
dedicated instruction TAG is executed.
POINT
(1) When "Execute at high speed" has been selected, be sure to create a user-
setting system area in the program memory of the control CPU.
In the case of a redundant system, create two user-setting system areas of the
same volume for the redundant CPUs in both systems. (Refer to REMARKS
in this section.)
When the control CPU is the Universal model QCPU, creation of a user
specified system area is not required.
(2) "Execute at high speed" can be registered to only one tag. (Multiple setting not
allowed)
(3) The access target CPU of the tag component that selected "Execute at high
speed" is the access target CPU setting No. 1 (control CPU). (Fixed)
(4) The device of the tag component that selected "Execute at high speed" can be
set within a total of 96 points.
(Example) When the component data types are all set to "Double word (2
points)", up to 48 component settings can be registered.
(5) If system switching occurs in the redundant CPUs, tag collection may stop for
approx. 15 seconds.
(c) Data write: Disable/Enable
1) Set whether data can be written to the tag or not.
Disable: Write to the tag data (device) is disabled.
Enable: Write to the tag data (device) is enabled.
2) When "Disable" is selected, the data cannot be written from "Tag
component test" in the Tag data monitor or the user screen (write
part).
POINT
After changing the settings, make sure to click on the "Save" button.
The settings are updated when the "Update" button on the Setting update screen is
clicked, the programmable controller is powered off and then on, or the CPU
module is reset.
MELSEC-Q
6 - 30