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Analog input and Modbus

 
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Storic



Joined: 03 Dec 2005
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Analog input and Modbus
PostPosted: Mon Feb 12, 2007 5:53 pm     Reply with quote
Can Modbus communicate the analog value on an analog input? if it can, any idears where to start and the Modbus.

Andrew Confused
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kender



Joined: 09 Aug 2004
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Re: Analog input and Modbus
PostPosted: Mon Feb 12, 2007 6:32 pm     Reply with quote
Storic wrote:
Can Modbus communicate the analog value on an analog input?

No, MODBUS is a digital communication protocol.
You could digitize the analog value and send it in digital.
You could research differential analog lines.
Neutone



Joined: 08 Sep 2003
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Re: Analog input and Modbus
PostPosted: Tue Feb 13, 2007 12:12 pm     Reply with quote
Storic wrote:
Can Modbus communicate the analog value on an analog input? if it can, any idears where to start and the Modbus.

Andrew Confused


Yes MODBUS uses registers for analog values. Input registers and holding registers are used to communicate 16-bit values. There are a few post with code for MODBUS in this forum. The MODBUS standard may be obtained from www.modbus.org. A lot of developer tools for the PC are available that support MODBUS at little to no cost. Most industrial PLC equipment can also support MODBUS slave devices.
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