Triantafillos Paradas

Newbie - Read inputs between Micrologix 1400 plcs

7 posts in this topic

Hello,

I am a newbie at Allen-Bradley and I need some general guidance.

I have three Micrologix 1400 plcs inside a gearbox. I need to read the inputs of plc1 and plc3 to plc2.

I would like to ask you which is the fastest way to do it?

Thank you very much for your time.

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MicroLogix 1400...(2) Serial ports with DF1/DH485/Modbus RTU/DNP3/ASCII protocol support, Ethernet port which supports Ethernet/IP, Modbus TCP/IP & DNP3 over IP.

What are you going to read these PLC inputs into?  That will define the best method for networking the system.

If your host supports Ethernet/IP, Etherenet/IP would be my choice.

What ports are available on each Micro processor?  You may have to add expansion modules if the Ethernet port is tied up on each Micro rack.

Edited by kaiser_will

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kaiser_will thanks for your reply.

Now all the interfaces (ports) are available.

I will use the ethernet to connect these plcs to SCADA, through a local switch. But I can still use it to read the inputs from the other two plcs. Don't I?

So, you suggest the  Etherenet/IP using messages?
 

Edited by Triantafillos Paradas

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You want to share PLC 1-3 input status with what?  It does appear Ethernet/IP is probably the easiest and most effective method.

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5 hours ago, kaiser_will said:

You want to share PLC 1-3 input status with what?  It does appear Ethernet/IP is probably the easiest and most effective method.

At PLC2 I need to read the inputs of PLC1 and PLC3.

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If you built an Ethernet network with the PLCs and the SCADA PC, the SCADA PC could read I/O data and the PLCs can read data from each other via MSG instructions.

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Just now, kaiser_will said:

If you built an Ethernet network with the PLCs and the SCADA PC, the SCADA PC could read I/O data and the PLCs can read data from each other via MSG instructions.

Thank you very much!

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