MODBUS TCP to ControlLogix

[Gabe1]

Hello All,


I'm looking for the Coles notes on how to inferface a Modbus TCP device (compressor controller) with a Logix 1756 L72 running V24. I've done a little reading but not enough to really have a handle on what the configuration/install might look like. I'm sure much of this has been covered in other threads. My apologies, if so. First question I have is: Do I absolutely need to have an hardware interface module such as those offered by ProSoft?


Cheers

 

[kamenges]

Depending on the hardware you have installed you might be able to pull off a direct connection through an Ethernet bridge (1756-EN2T or better). See this blog post:

https://theautomationblog.com/which-controllogix-models-support-modbus/

If not, you could use an Ethernet gateway from a company like Realtime Automation ( https://www.rtautomation.com/ ) to act as a translator for you.

Keith

 

[diat150]

Hello All,


I'm looking for the Coles notes on how to inferface a Modbus TCP device (compressor controller) with a Logix 1756 L72 running V24. I've done a little reading but not enough to really have a handle on what the configuration/install might look like. I'm sure much of this has been covered in other threads. My apologies, if so. First question I have is: Do I absolutely need to have an hardware interface module such as those offered by ProSoft?


Cheers

safe yourself alot of time(and money) and use something like a red lion datastation or a maple systems cmt-g01

 

[Firejo]

https://www.spectrumcontrols.com/products/universal-gateway/

https://www.youtube.com/watch?v=Nfq_0WWQav4

https://www.youtube.com/watch?v=QJdjioqoljg&t=19s

 

[Contr_Conn]

Modbus TCP AOI released in 2020 are available in Sample Code library and easy to use.
No extra hardware to purchase.

 

[Ken Moore]

For smaller applications like yours. The AOI that Contr_Conn mentioned is the way to go.
I have implemented it several times in last year or so, works much better than the old subroutine did. I recommend you run it in a dedicated routine, I usually use a 50ms routine.

 

[Contr_Conn]

....I recommend you run it in a dedicated routine, I usually use a 50ms routine.

The AOI manual said 10ms is OK and gives tag update rates based on that.
If application does not need speed, then 50ms should be Ok too.

 

[Gabe1]

My thanks to everyone for their help. I plan to experiment with the AOI this afternoon.

Gabe

 

[TacknoC]

+1 for the Red Lion gateway.
The Modbus TCP AOI from Sample Code Library is -indeed- a vast improvement over previous gen of the same AOI. However, I still feel like it's bloated beyond what it could be (several nested AOIs, duplicate working variables of significant size, remnants of previous code, etc). If memory is not a concern, an external gateway is not desirable, and multiple end-devices are not required, this AOI also gets a +1.

 

[504bloke]

+2 for the RedLion DSP

I have lost days on things like this - Use a RedLion and its done in a morning....

 

[Firejo]

The Spectrum Controls Universal Gateway can be setup in about 30 minutes and doesn't require any software to set it up nor does it involve any PLC programming.

 

[ControlSystems]

Look for the Modbus Add on instruction in RA knowledge base.

Look for the Modbus Add on instruction in RA knowledge base. I looked at and am interested to hear more. Never tried it myself

 

[EICS]

The Spectrum Controls Universal Gateway can be setup in about 30 minutes and doesn't require any software to set it up nor does it involve any PLC programming.

i too recommend spectrum controls universal gateway, its a very simple and easy set up device, in fact Firejo recommended it to me in a past thread an i VERY am thankful he did. (Thanks Mate)

 

[lee1968nh]

The AOI works fine...bit of a memory hog but works fine.

 

[Firejo]

i too recommend spectrum controls universal gateway, its a very simple and easy set up device, in fact Firejo recommended it to me in a past thread an i VERY am thankful he did. (Thanks Mate)

I'm glad it worked out