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Old December 12th, 2017, 12:40 PM   #1
RBergmann
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MicroLogix 1400 MB TCP & RTU

Does anyone know if the MicroLogix 1400, Series B, can handle both Modbus RTU & Modbus TCP at the same time? I am working on a project that has existing RTU communications. I need to provide a chart recorder with two digital signals for alarm messages. However the customer purchased the chart recorder without digital inputs so I thought, since the 1400 can handle Modbus comms, maybe I could send the bit signal via TCP.

Does anyone have experience with this?
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Old December 12th, 2017, 01:14 PM   #2
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Yes this should work. Here are a couple of references for both Modbus RTU (RS485) and Modbus TCP (Ethernet).

http://www.plctalk.net/qanda/showthread.php?t=86796

http://www.plctalk.net/qanda/showthread.php?t=73953

http://www.plctalk.net/qanda/showthread.php?t=76852

Regards,
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Old December 12th, 2017, 01:21 PM   #3
RBergmann
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Quote:
Originally Posted by gclshortt View Post
Yes this should work. Here are a couple of references for both Modbus RTU (RS485) and Modbus TCP (Ethernet).

http://www.plctalk.net/qanda/showthread.php?t=86796

http://www.plctalk.net/qanda/showthread.php?t=73953

http://www.plctalk.net/qanda/showthread.php?t=76852

Regards,
None of these links tells me if the two protocols can be used in the same code, at the same time, in a MicroLogix 1400.
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Old December 12th, 2017, 02:28 PM   #4
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https://www.mesta-automation.com/mod...crologix-1400/

The above thread shows an example of setting up both the serial and Ethernet ports with Modbus RTU and TCP respectfully.

This may help you out.
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Old December 12th, 2017, 07:22 PM   #5
Ken Roach
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The MicroLogix 1400 Series B can simultaneously support Modbus/TCP on the Ethernet port and Modbus RTU on a serial port.

The EtherNet/IP protocol also happily co-exists on the same Ethernet port with the Modbus/TCP client or server.
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