COMM: Coils and Registers

[The AList]

==> Automation List post by rudd...
To view or reply to this thread: http://www.control.com/thread/1254902728#1254989467


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Re: COMM: Coils and Registers
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> All are device dependent. Modbus Registers are 16 bit register values that contain a binary value that can represent anything. <

Yes, but for example in the modicon 884 controller the coils 761-768 are used for the exception status coils.  

My question is: is possible that any modbus salve device has 65536 coils and in addiction 8 exception status coils? Because in the modbus specification there are no obligation to use the coils in the range 0-65535 for the "exception status coils". 
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