Serial Port on the Logix 5562 to RS-485 - PLCS.net

RetiQlum · March 20th, 2017, 02:50 PM

I have a 5562 that I need to attempt to connect to a RS-485 Emerson Drive. The issue I have is that I can't for the life of me find the pinout.

Also, is this possible without a converter? I remember needing to use an adapter with other PLCs. I need it to do Modbus-RTU. I will be getting the ProSoft (4 ports needed if you believe it) cards with the new PLC when it comes in, but I need to use this old one for the time being.

Thanks in advance.

dmargineau · March 20th, 2017, 03:36 PM

You will need an 1761-NET-AIC converter to connect the L62 controller Serial port to a RS-485 network.
http://literature.rockwellautomation...m004_-en-p.pdf

For using the L62 controller as a Modbus Master/Slave device follow
http://literature.rockwellautomation...p129_-en-p.pdf

Modbus applications examples are part of the RSL5k/Studio 5000 install Samples folder.

RetiQlum · March 20th, 2017, 03:48 PM

Thanks. That's what I feared.

nhatsen · March 20th, 2017, 04:34 PM

Quote:

Originally Posted by RetiQlum

I will be getting the ProSoft (4 ports needed if you believe it) cards with the new PLC when it comes in...

Just curious: Why do you need 4 ports?

RetiQlum · March 20th, 2017, 05:04 PM

I need 4 ports because there are 4 drive controllers. The response time for serial communications is too low. Of course if we just added the Ethernet/IP modules to the controllers would could save something like $8k per system these go into.

Ken Roach · March 20th, 2017, 06:21 PM

You will probably not be satisfied with the response time of the Modbus/RTU sample code for the 1756-L6x serial port, especially if you're daisy-chaining it to multiple devices.

How many read/write registers to you need to do per Emerson controller ?

If you just need to do a few, and you don't mind spending a little time experimenting with configuration, the GridConnect NET485 is the most cost-effective way to connect a handful of Modbus/RTU serial registers to a ControlLogix over Ethernet.

It only addresses one slave device, but it's $100 retail. And once you get the configuration file figured out, you just load it via TFTP and you're done.

nhatsen · March 20th, 2017, 06:59 PM

Quote:

Originally Posted by RetiQlum

I need 4 ports because there are 4 drive controllers.

Why don't you connect the drivers in a dasy-chain?

Quote:

Originally Posted by RetiQlum

The response time for serial communications is too low.

The response time will be an issue if you intend to control the speed using a PID from the controller. In similar configurations, I use the internal driver's PID and set the speed from the PLC. Of course, I don't know if that's possible in your application.

oldnerd · March 20th, 2017, 08:53 PM

Check out the Prosoft card.

RetiQlum · March 21st, 2017, 07:19 AM

I'm getting two of them. I just don't have them, or the PLC I need yet and want to keep writing code.

March 20th, 2017, 02:50 PM	#1
RetiQlum Member Join Date: Feb 2017 Location: Pennsylvania Posts: 27	Serial Port on the Logix 5562 to RS-485 I have a 5562 that I need to attempt to connect to a RS-485 Emerson Drive. The issue I have is that I can't for the life of me find the pinout. Also, is this possible without a converter? I remember needing to use an adapter with other PLCs. I need it to do Modbus-RTU. I will be getting the ProSoft (4 ports needed if you believe it) cards with the new PLC when it comes in, but I need to use this old one for the time being. Thanks in advance.

March 20th, 2017, 08:53 PM	#8
oldnerd Member Join Date: Mar 2011 Location: Al Posts: 74	Check out the Prosoft card. __________________ "Keep it simple."

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March 20th, 2017, 03:36 PM	#2
dmargineau Lifetime Supporting Member Join Date: Dec 2011 Location: Midwest Posts: 2,276	You will need an 1761-NET-AIC converter to connect the L62 controller Serial port to a RS-485 network. http://literature.rockwellautomation...m004_-en-p.pdf For using the L62 controller as a Modbus Master/Slave device follow http://literature.rockwellautomation...p129_-en-p.pdf Modbus applications examples are part of the RSL5k/Studio 5000 install Samples folder.

March 20th, 2017, 03:48 PM	#3
RetiQlum Member Join Date: Feb 2017 Location: Pennsylvania Posts: 27	Thanks. That's what I feared.

March 20th, 2017, 05:04 PM	#5
RetiQlum Member Join Date: Feb 2017 Location: Pennsylvania Posts: 27	I need 4 ports because there are 4 drive controllers. The response time for serial communications is too low. Of course if we just added the Ethernet/IP modules to the controllers would could save something like $8k per system these go into.

March 20th, 2017, 06:21 PM	#6
Ken Roach Lifetime Supporting Member + Moderator Join Date: Apr 2002 Location: Seattle, WA Posts: 13,728	You will probably not be satisfied with the response time of the Modbus/RTU sample code for the 1756-L6x serial port, especially if you're daisy-chaining it to multiple devices. How many read/write registers to you need to do per Emerson controller ? If you just need to do a few, and you don't mind spending a little time experimenting with configuration, the GridConnect NET485 is the most cost-effective way to connect a handful of Modbus/RTU serial registers to a ControlLogix over Ethernet. It only addresses one slave device, but it's $100 retail. And once you get the configuration file figured out, you just load it via TFTP and you're done.

March 21st, 2017, 07:19 AM	#9
RetiQlum Member Join Date: Feb 2017 Location: Pennsylvania Posts: 27	I'm getting two of them. I just don't have them, or the PLC I need yet and want to keep writing code.

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