huy doan

PLC hardware

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Please help me to establish PLC system with best solution for my problem.

I want to make SCADA have 1 PC to supervise 4 input analog is: FLOW, PH, Temperature, Total, Clo.

Request to use Allen bradley PLC. and my system will communicate to YOKOGAWA DCS by modbus.

So help me to choose allen bradley plc module is available for my system.

I will use winlog pro 33.2 SCADA because price is better than Rockwell automation.

Thanks.

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For this new PLC application, total I/O count is (4) analog inputs.  Allen-Bradley CompactLogix 5370 L2 processors (1769-L24ER-QBFC1B  &  1769-L27ERM-QBFC1B) both have (4 each) universal analog inputs.  Refer to pg 12/40.  http://literature.rockwellautomation.com/idc/groups/literature/documents/sg/1769-sg001_-en-p.pdf

http://apac.rockwellautomation.com/oem/docs/motion/india_CompactLogix_5370_L2.pdf

And you need Modbus communication ability.  Would that be Modbus TCP over Ethernet, or Modbus RTU?  The 5370 L2 Ethernet port supports open-socket protocol for utilization of Modbus TCP.

I have little experience with Modbus via serial.  http://literature.rockwellautomation.com/idc/groups/literature/documents/ap/cig-ap129_-en-p.pdf

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Thanks Mr.kaiser.

OK, I see CompactLogix_5370 is available for my application. But I have 1 PC( SCADA) to supervise 4 analog and we can see history. So how can communicate from PLC to SCADA. Maybe we need more ethernet module?

And I think we need send signal to Yokogawa DCS by Modbus RTU.

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Ethernet/IP is a very common protocol for Allen-Bradley/Rockwell, and is built into the CompactLogix 5370 L2 processor.  http://literature.rockwellautomation.com/idc/groups/literature/documents/sg/1769-sg001_-en-p.pdf

To understand the built-in and optional communication protocols for the Allen-Bradley CompactLogix 5370 L2 series PLCs, refer to the users manual, page 119 http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1769-um021_-en-p.pdf

5370 L2 processors support DeviceNet with addition of 1769-SDN module.  http://literature.rockwellautomation.com/idc/groups/literature/documents/qs/iasimp-qs025_-en-p.pdf

Modbus TCP over Ethernet is supported.  Modbus RTU would require a special communication module.  Ethernet/IP is built in; suggestion is made to research if Ethernet/IP is supported by your SCADA package.

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Thanks for your reply.

I have a question. I want to lock controller logic to prevent other people download program. How can I do?

I already read about Logix security tool. But in my understand, this is only prevent to upload and edit program but still can download new program to PLC. 

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Switch the Run/Prog toggle switch all the way to RUN mode and secure the cabinet.   When the keyswitch is in RUN mode (not Remote Run), the controller will not accept a download or edit.

There is no way to prevent a new program from being downloaded to a controller if someone has physical access to the controller.

Edited by Ken Roach
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I want to authorize users on a computer.

For example, only the Engineering account can use Rslogic5000 to download the program to the PLC, Others acc is only operate on factory talk view but can't use Rslogic 5000 to download.

I read in Factory talk security document. There is Windows-linked user accounts but I don't know how to apply it to this situation.

Please guide me. We use Rslogic 5000 version 20.01.

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