Remote Terminal
CAN bus line adapting card of the remote-action system RTU is designed by Keith Farren
Summary: This text combines a concrete CAN bus line industrial control system, has analyzed function and architecture of CAN card first, then has analyzed the interface circuit design methods and CAN total collinear dispatcher’s circuit of ISA bus line and CAN card of the industrial computer. Provide the hardware circuit design method of CAN bus line adapting card of an intact remote-action system RTU. Keyword: Remote-action system; RTU; Industrial computer; CAN bus line adapting card; Interface circuit
The remote-action system of the foreword refers to the control equipment remote control controlled object, and a kind of control system of the two exchange message. The present remote-action system is the data acquisition and monitors the control system, it regards computer as the core, utilize computer technology, communication skill, control technique,etc. in order to finish a kind of control system of remote control, remote measurement, remote signaling, remote regulating synthetically. The remote-action system can be divided into three major parts: End of deployment, passway, distant place terminal unit (RTU) . RTU mainly accepts the order of the end of deployment controls each Living controlled object, and monitor to the on-the-spot controlled object and send the data to managing the end the data. Fig. 1 is RTU system structure chart based on CAN bus line. What this text should discuss is to insert the hardware designing technique of CAN adapting card in the industrial computer ISA trough.
The function of CAN adapting card and intellectual adapting card of the structure are inserted in ISA expansion slot of the industrial computer, it locates between industrial computer and CAN bus line node, itself is a node machine (host node) of CAN bus system too . It is to receive industrial computer for order to be main,under issue to CAN bus line node(each function module of RTU)s the next ,And receive the field data to convey from the next CAN node machine to the industrial computer. The structure of the adapting card is shown in Fig. 2 and shown.
ISA bus line of the industrial computer and interface circuit design of CAN adapting card should realize the data transmission between PC and CAN control device, must set up the Two-way data switching path between PC and adapting card MPU on. Realize the one-chip computer system exchanges the data and has the following two implement methods with the host computers through ISA bus line: First, static data transmission. Adopt the parallel interface device 8255,etc., or the latch such as 74LS373,etc. forms FIFO of a byte depth. The comparatively simple method, but one transmissive data bulk little, adapt to the intersection of data bulk and little, the intersection of speed and occasion of requiring high only; Second, share the external data storage of the one-chip computer system. Can adopt the integrated dual port RAM or common RAM directly at this moment, adding some control logic makes up the circuit of dual port RAM. The latter of this design alternative. Common dual port RAM has products of IDT Company and Cypress Company on the market at present, this card chooses 2K
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