Guys,

I've here a A-B PLC-5 who's talking over RIO to a 1394GMC Turbo servo-drive, no problem at all. BUT, we have to change the PLC-5 for a CompactLogix L35 PLC, and this PLC don't support a RIO scanner.

The 1394GMC drive has the opportunity to communicate over DH-485 protocol which is also supported by the CompactLogix platform. I've read about 900 pages of the GMC manual but can't find enough information to change the GMC program.

Has anyone another idea for the communication between the CompactLogix and the servo-drive, or a step by step plan to setup the DH-485 communication on the 1394GMC Turbo?

Thanks in advance!

Jack

 

Hi,

probably need to know a bit more about the data going between the two.

Just some thoughts, RIO is more structured and reliable than DH484, with a minimum speed of 57.6k, while DH485 will require messaging and is likely to be 19.2k max. Messaging will need to use the MSG instruction, and will need coding. I have only seen DH485 used with Panelview's and displays, although I guess messaging would be possible, which would be okay if data speed is not an issue.

If the data speed is an issue you could look at discrete IO between the two devices. The other thought is to use an ControlLogix rather than CompactLogix, which would be my first choice. Then I would consider dropping the GMC Turbo for a GMC analogue or possibly sercos, and use a motion card.

 

Hi,

A Control-Logix is to expensive for the application.

The data will be the rate, speed en length of the transport, with some bits for state of the drives.

RIO has a speed op 230 Kb/s but I don't think this is a issue. And yes I can use the I/O for state and start of the move, but the speed and rate information should go over DH485.

Regards,

Jack