reference lines of Chart Pro

[grhsc]

I only select one tag as the curve of the trend chartpro, can I set the max and min reference lines? For example, if my trend is voltage, I want to add the max/min voltages to see if the current voltage is within the appropriate range.

[Mikhail]

In this case, create 2 extra channels, max and min. Set them as limits of the 1st channel (see this page). To display them on a chart, you need to select them manually or display chart as a view with predefined channels.

[grhsc]

I don’t quite understand what you mean “ create 2 extra channels”

Do I need to create it in the channels menu or in limits?
I remember that the contents of channels are all from the real communicator, and I don’t quite know how to create extra channels

Can you give me more guidance please?

• This reply was modified 1 year, 1 month ago by grhsc.

[Mikhail]

Create 2 channels of the Calculated/Output type in the Channels table.
Specify their numbers in the Limits table in a limit row.
Display the created channels in a table view.
Then provide screenshots.

[grhsc]

I can create 2 channels of the Calculated/Output type in the Channels table, but I don’t know how to set their values ​​to constants (such as voltage max = 400V and min = 320V

https://drive.google.com/file/d/14FRlbuHy8oGxh-WBX2e3ogpGmoZC3wHA/view?usp=drive_link

Also, I can’t specify numbers in the Limits table, I can only specify what I set in the limits tab

https://drive.google.com/file/d/1xe5QxEZ95yp3YXbzdZkE2pBj9TzH146L/view?usp=drive_link

I think I must have made a mistake somewhere.

[grhsc]

by the way, I would like to provide suggestions on this topic.
The current method of creating two channels is a compromise. It requires saving these two meaningless channel values ​​in the database. If many variables need max/min and have different ranges, this should not be a good method.

Since high and low are already defined in limit, can you add a setting in the parameter file of chartPro to display/enable high and low limit values? Would this be a good idea?

https://drive.google.com/file/d/1LvIvNQ8oYfkXLEKgl1ETJqWX0aqrcK6N/view?usp=drive_link

[Mikhail]

> The current method of creating two channels is a compromise. It requires saving these two meaningless channel values ​​in the database.
If limits can be changed by a user, channels are not meaningless. In general, I agree with you, it would be a useful feature to display limits on chart.

Specify SetData() output formula for min and max channels. And create a new limit record for the channel.

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