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#1 |
Member
![]() ![]() Join Date: Feb 2017
Location: Pennsylvania
Posts: 27
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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. |
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#2 |
Lifetime Supporting Member
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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. |
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#3 |
Member
![]() ![]() Join Date: Feb 2017
Location: Pennsylvania
Posts: 27
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Thanks. That's what I feared.
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#4 |
Member
![]() ![]() Join Date: Oct 2010
Location: Venezuela
Posts: 660
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Just curious: Why do you need 4 ports?
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"If you can't solve a problem, then there is an easier problem you can solve: find it." (George Pólya) |
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#5 |
Member
![]() ![]() Join Date: Feb 2017
Location: Pennsylvania
Posts: 27
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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.
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#6 |
Lifetime Supporting Member + Moderator
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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. |
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#7 |
Member
![]() ![]() Join Date: Oct 2010
Location: Venezuela
Posts: 660
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Why don't you connect the drivers in a dasy-chain?
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.
__________________
"If you can't solve a problem, then there is an easier problem you can solve: find it." (George Pólya) |
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#8 |
Member
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Check out the Prosoft card.
__________________
"Keep it simple." |
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#9 |
Member
![]() ![]() Join Date: Feb 2017
Location: Pennsylvania
Posts: 27
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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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