CAN BUS + PROPORTIONAL HYDRAULICS 1

[hydromech]

Hello...

I'm on self help crash course about CAN BUS networks. I just have one question about them with regard to proportional and servo amplifiers. Can't get the answer off the interweb...

I think they work like this...

The PLC puts an output to the CAN transmitter which is broadcast in the form of a node, across the network and processed by the reciever. That signal is then passed through a network card of some sort and then into the amplifier.

Basically the CAN network gives a signal and all of the control is done by the servo amplifiers that are local to the valve/actuators?

Any help will be welcomed...I know about the electro-hydraulic bit...just dont know about the CAN bit.


Many thanks in advance

Hydromech

 

[itsmoked]

Try this on:

http://en.wikipedia.org/wiki/Controller_Area_Network

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[felixc]

The CAN-bus itself, and the control system, are two independent things.

CAN is used to transmit information between the modules. Its advantage is that you can place many different signals between many different modules, all on a single bus. Should you add elements to your system, there would be less redesign. Its initial objective of CAN was to reduce the wiring in cars. The mandatory reliability that came with it made this bus attractive in other applications, like industrial and medical.

Back to your control system, the brains of it can be in the central processor, or it can have subfunctions in the modules. It really depends on what type of system that you are using. The CAN-bus can be used just to send commands and read status of a module that takes care of the lower servo loops, or it can be used to just send orders to the valves thus leaving all the control functions to the main controller. I know of an autosteering system that uses the CAN-bus. General steering commands are sent to the controller, and all the valve controls and response time functions are left to the module.

 

[hydromech]

Thanks felixc...here have a star;-)