Modbus Data Formula

[TroyV23]

Hi,
I am trying to read an alarm Register on a Modbus TCP device.
I have it communicating correctly right now reading a float value.

I want to read a Register at:
HEX 0x812
uint16 data type
HiByte, Bit 0-2

I know this must be a formula, I’m just not sure how to do it.

[Mikhail]

Hi,
Please make a screenshot of the received data and provide an example what data you need to extract.

[TroyV23]

• This reply was modified 1 year, 11 months ago by TroyV23.

[TroyV23]

How Do I capture received data?

[Mikhail]

Check Communicator – Communication Lines – Your line – Line Stats – Line Log

[TroyV23]

I just realized that my received data is missing the last 2 words?

Sent:

01 02 00 00 00 06 CE 04 08 0E 00 02

Response:

01 02 00 00 00 07 CE 04 04 00 00 FF FF

I expected response to be:

01 02 00 00 00 07 CE 04 04 00 00 FF FF 00 00

Do you have any clues as to why that is?

[Mikhail]

Could you make a screenshot of the log?

[TroyV23]

[Mikhail]

Communication works well.
What tag data is displayed on the device data page? Could you clarify the question?

[TroyV23]

I was able to get it working, my device actually had a modbus register that defined everything for me.

I still have a question though:

I have an alarm channel that either shows “0” when alarm is OFF or “256” when alarm in ON. When the event shows it gives a generic description that is not useful for users. Is there a way for me to define what the event says?

I also want a formula to show “1” instead of “256” when alarm in ON.

[Mikhail]

> Is there a way for me to define what the event says?
The answer depends if you use Rapid SCADA 5 or 6. For version 6, set channel properties:
Input formula would be Cnl > 0 ? 0 : 1
Format is Off-On

[TroyV23]

Input formula would be Cnl > 0 ? 0 : 1
Format is Off-On

Thanks!
That worked perfectly, I just had to make a custom format to reverse the “Off-On” to “On-Off”.

[TroyV23]

I now have the On-Off condition working but I realized it broke my LED scheme component condition. How do I make the LED indicator condition show green when no alarm, and red when alarm is on.
The condition options have to be numbers, and that doesn’t work anymore.

Thanks in advance!

[Mikhail]

How do I make the LED indicator condition show green when no alarm, and red when alarm is on

Open the Conditions property of the component and change the colors.

[TroyV23]

I reversed the conditions, it works now 🙂

[Author]

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