how to send a modbus value

[jjdesarrollo]

Hello,

First of all i would like to thank to the rapid scada team. This is a really powerful tool.

Well, I am use to work with some commercial SCADAs, so that is why i am going ask something that perhaps somebody else already asked, but sadly i could not find it.

How do i send a modbus value directly from scada Web Screen. I mean, does rapid scada have a text box where i can set a value and then send it to the Modbus Device.

Thanks in Advanced

• This topic was modified 5 years, 11 months ago by Mikhail.

[manjey73]

Standard command in control channels in Administrator settings-control Lines
The command input window will be called. Using formulas, you can make a range from which the minimum or maximum value of the range will be sent when an input error occurs

[Mikhail]

does rapid scada have a text box where i can set a value and then send it to the Modbus Device

Yes. You need:
1. Create an output channel.
2. Specify this channel in a scheme or a table view.
3. Configure a command in your Modbus template.

Also read this article.
In case of follow up questions, ask here.

[ngiussani]

Hi,

I’m new to this forum. Is there a way to use a control like a spinbox to send values to a device? Or am I required to use the popup implemented in the Schemes?

I’m trying to configure a setpoint for an HVAC system in my office, but it seems I need to input the data manually.

I know it may be a little to much to include in the same question, but is there a way (maybe with formulas) to limit the value to send with the value from other input channels?

Thanks in advance

[Mikhail]

Hi,

Is there a way to use a control like a spinbox to send values to a device? Or am I required to use the popup implemented in the Schemes?

Could you provide an example image of spinbox? If a value is a number, you should input it manally. However, you can create several buttons with different values.

I know it may be a little to much to include in the same question, but is there a way (maybe with formulas) to limit the value to send with the value from other input channels?

It’s better to create a new topic.
Yes, use formula for an output channel.
For example: Math.Max(Math.Min(Cmd, 10), 0)

[ngiussani]

Hi Mikhail,

Thank you very much for your answer. The spinbox control is as it follows:

I understand from your comments that is not an option, at least now.

I’m sorry for mixing questions. I have a lot and didn’t want to open a lot of topics, but I’ll be patient and ask one at a time.

[Mikhail]

Hi,

Thank you for the screenshot. Currently, you should input a value in a popup window or create several buttons to set different values. Or both.

[Sergei]

Yes. You need:
1. Create an output channel.
2. Specify this channel in a scheme or a table view.
3. Configure a command in your Modbus template.

The available Command values are just binary/discrete (On/Off, Arm/Disarm, Run/Stop). How do I send a float value to the device?
Do I have to set a formula to write to the Modbus device using an output channel?

Using the Communicator Command window and the interface both reset the register to zero (a pulse-driven flow-meter counter that needs to be manually synchronized to a physical value in the field), but no one actually write the desired value to the register.

As a side note, I tried a modbus utility and the value is correctly written.

[Mikhail]

How do I send a float value to the device?

Usually writing a float requires 0x10 Modbus function. Set the Multiple checkbox, specify data type, and try sending command without any formula.
If something goes wrong, provide logs and screenshots.

[Sergei]

Thanks. It worked ok with 0x10 (Multiple). Tried this yesterday although didn’t know why Single didn’t work.

Thanks for replying.

[Author]

Posts