Omron V022-E3-1 operation manual 4-9-4Display History, Section

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4-9-4 Display History

The display history function records the number of times that screens for which a display history attribute has been set by the support tool are displayed, and dis- plays the accumulated occurrence data either in order of occurrence or order of ￿frequency format.

Recording the Display History

The display history is recorded using the procedure given below.

Operation 1. Setting the screen attribute

When creating a screen using the support tool, set the display history record- ing attribute for the screen if its display history should be recorded. When set- ting the attribute, register a message no longer than 24 characters expressing the contents of the screen.

A display history is recorded only for screens for which the display history re- cording attribute is set.

2.Initializing the display history data memory

Before starting to record the display history, initialize (clear) the display history data memory either by sending the display history data memory initialization command from the Host (page 76) or by selecting the “Screen Data Memory” initialization menu in the Maintenance Mode (page 72).

If the memory becomes full of history data, the history data for new occur- rences cannot be recorded.

3.Executing the display history recording

If a screen for which the display history recording attribute has been set is dis- ￿played during operation, the display history data is recorded in the NT600S.

In the display history, the following data relating to the displayed screen is stored in the memory.

-Screen number

-Message expressing the contents of the screen

Each time a screen number for which the display history recording attribute has been set is specified by the PC/Host, the data indicated above is recorded in the corresponding data area.

The data recording capacity is 1023 screens if the display history is recorded in the order of occurrence and 255 times per screen if it is recorded in the order of fre- quency. Note that only the screen number and the message are recorded.

Reference The recorded data is retained even when the power is turned off since it is backed up by battery. However, if no battery is installed, the recorded data is lost when the power is turned off.

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