Bit/Byte addressing Ethernet/IP

philhoward

Quick question; how do you access a bit address from within a byte in the Unit Mapping dialog when setting up signals?

It's set to 64 bytes in/64 bytes out, but need to access bits (partially for DI/DO, but also for GI/GO).

 

Cheers.

zealous_swe

Don't understand the question..

What is it that you want to do? Do you mean 'reading'  e.g. bit 100's value or what?

 

 

philhoward

If there are 64 bytes, then i need to access bits of those bytes (i.e. would bit 3 of the first byte be 0.3?)

 

If one byte is used for each signal irrespective of its size (i.e. a boolean DI, or a numeric GI), then i have a major problem as the application requires about 200 signals to and from our PLC.

 

if it was a normal PLC, then the bits would be:

0.0

0.1

0.2

....

0.7

1.0

1.1

 for bit addressing, then bytes are the "whole" numbers

2

3

4

...etc

 

Does that help?  I can't see anything in the manual for the Fieldbus Adaptor that suggests how you can do this (if you can).