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CANbus Communication

CANbus Communication. Physical Layer. CANbus. Unitronics’ CANbus runs on the same physical layer as A.B.’s Device Net, but uses a different protocols. A CANbus network can include up to 63 PLCs and mix different models of M90/91as well as Vision.

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CANbus Communication

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  1. CANbus Communication

  2. Physical Layer CANbus Unitronics’ CANbus runs on the same physical layer as A.B.’s Device Net, but uses a different protocols. A CANbus network can include up to 63 PLCs and mix different models of M90/91as well as Vision. The CANbus port can be used in 4 ways: • To connect a net of up to 63 units to a PC • To connect a net of up to 64 units one to the other • To exchange data with 3rd party device • To “see” controllers via PC 2/19

  3. CAN bus wiring Specifications 3/19

  4. CAN bus Cable Lookout 4/19

  5. CANbusNetworking Methods of data exchange: • PLC to PLC • CANbus ISC (Inter-Save Connection) • Data is broadcast over theCANbusnetwork via system operands, • where each unit can read information from up to8 other PLCs in the network. • UniCAN DataCom • This enables a PLC in theCANbusnetwork to exchange data • with up to: 60 other networked PLCs. 5/19

  6. CANbusNetworking PLC to 3rd Party Device • CANopenSupports data communication with remote devices • according to the CANopen standard. • CANbus , Layer 2 • Enables Vision controllers to send and receive data with remote devices • that supportCANbusprotocol. 6/19

  7. Unit ID 1 Bridge Unit ID 2 Unit ID 3 CANbus Network to PC 7/19

  8. CANbus ISC CANbusISC is a multi-master protocol. Via theCANbusport, you can: • Network up to 63/64 controllers • Each networked PLC broadcasts specific data to the network • 16 System Bits (SB 200 to SB 215) • 16 Inputs (I 0 to I 15) • 2 System Integers (SI 200 and SI 201) • Each unit can read information from up to 8 other • controllers in the network • Supported both by M90, M91 and Vision controllers • Mixed networks possible 8/19

  9. Communication UniCAN Multi-Master protocol • Up to 60 units in network • Via UniCAN, a Unitronics' • PLC can exchange data • with up to 60 other • networked PLCs • UniCAN can send up to 32 • messages, each containing • 16 integer values, totaling • 512 MI register values • during a single program scan 9/19

  10. UniCAN Assign each networked controller a unique Unit ID Numberandinitialize theCANbus portto UniCAN. 10/19

  11. UniCAN Send Registers You can send a vector of values up to 16 integers long in a single Send function. 11/19

  12. Broadcast Use Broadcast to send an MB and an MI value to all controllers in the UniCAN network. Source controller ID# 3 contains 123 in MI 50, and has MB 50 ON: allcontrollers in the network will have 3 written into SI 201 123 written into SI 200, and SB 200 will be turned ON. 12/19

  13. Check Alive Signal Each 0.5 seconds, a unit sends an 'Alive' signal to the CANbus network. The Check Alive Signal function receives the signal. 13/19

  14. Message Arrived When a message arrives from the networked unit whose ID # is given in the function, the Status MB turns ON. When the message is received, the corresponding bit in SIs-240-243, which provide a bitmap of all units in the UniCAN network, turns OFF. 14/19

  15. Thank You ! 15/19

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