1 - 24 Machine Components 704-0212-209 VM Series Maintenance and Safety Manual
CANbus Overview
The CANbus is a multi-master serial bus developed for the controller area network (CAN).
This bus is the input/output (I/O) center of the ISA platform.
The CANbus controller board, the I/O Interface board, and the CANbus DC I/O node
handle the I/O control functions within the CNC controller. The external node used by the
machining center is the console interface.
CANbus Controller Board
The CANbus controller board is an intelligent AT bus board for executing logic control
programs, controlling CANbus I/O, controlling local 24-volt I/O, and monitoring the on-
board A/D converter.
CANbus DC I/O Backplane
The CANbus DC I/O backplane distributes power and CANbus signals to the I/O interface
board. The basic voltage levels are +5VDC, +/-12VDC, +24VDC. There are three isolated
grounds: digital GND, machine GND, and analog GND. The backplane slot determines the
node address of the board.
I/O Interface Board
The CANbus I/O interface board forms the interface between the motion subsystem and
the CANbus controller I/O. The I/O signals on this board are buffered and then routed
within the enclosure over a ribbon cable to the motion or CANbus subsystems. The board
uses Honda connectors.
CANbus DC I/O Node
The CANbus DC I/O Node board mounts on the CANbus DC I/O backplane in the
extension enclosure to the ISA card rack. This board communicates with the machine
through 32 input and 32 output connections, and transfers information through the
backplane to the CANbus controller.
The 24-volt solid state outputs are current limited to 150mA. Outputs are disabled at
power-up and when the E-Stop button is depressed.
Multiple boards may be used to provide additional I/O. The extension enclosure accepts
two of these boards in addition to the I/O interface board; all are connected to the
CANbus DC I/O backplane. Expansion for other boards is possible.
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