Created Date: September 11,2012

Created by: allukes

Theoretically, you could use X and Y's if those bits don't exist on your hardware. Its only memory. If the IO modules aren't there to modify it, you could do anything to it in your program. However, its a bad practice. Only do it if you run out of memory.

The GX's and GY's, I believe were intended for Remote IO. Again if the hardware is not enabled to control those memory areas, you can use them. In fact, I use them all the time for HMI's. GX's for HMI Pushbuttons and GY's for indicators. It's kind of like remote IO. its self documenting, when you see it in your program, you know the G bit's are from the HMI. I also believe that if you use consecutive bits in the word, the drivers are smart enough to transfer the entire word instead of a bit at a time.

Which PLC's are you using? Is this an existing machine or one you are designing.

Created Date: September 11,2012

Created by: Richardv

Thank you

:) The network will have 3 dl260's and 1 dl06 processors. I have already written the code but am waiting for the machine to be completed so I can install the software. Making changes now is fairly easy as I have the time.

If I did not have the hardware and was to order it now I would probably have chosen the DoMore series and used Modbus TCP/IP. It would have made things a lot simpler for future expansion and possible manufacturing network communications and datalogging.

Created Date: September 10,2012

Created by: Richardv

I know that in general a on/off button on a micro-graphic panel should not operate on X's or Y's. What about GX's and GY's.

I have a network operation on an automated assy machine communication via modbus/rtu for non speed critical data. I need to transfer 10 to 20 discrete data values. Using bit of word is a little difficult as when the master receives data from 1 slave it needs to send some of them to another slave and different parts to a 3rd slave.