1. CANbus Communication

2. Physical Layer CANbus The CANbus port can be used in 4 ways:
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
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3. CAN bus wiring Specifications
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4. CAN bus Cable Lookout
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5. CANbus Networking Methods of data exchange: PLC to PLC
CANbus ISC (Inter-Save Connection)
Data is broadcast over the CANbus network via system operands,
where each unit can read information from up to 8 other PLCs in the network.
UniCAN DataCom
This enables a PLC in the CANbus network to exchange data
with up to: 60 other networked PLCs.
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6. CANbus Networking PLC to 3rd Party Device
CANopen Supports 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 support CANbus protocol.
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7. CANbus Network to PC
Unit ID 1
Bridge
Unit ID 2
Unit ID 3
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8. CANbus ISC CANbus ISC is a multi-master protocol.
Via the CANbus port, 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
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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
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10. UniCAN
Assign each networked controller a unique Unit ID Number and initialize the CANbus port to UniCAN.
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11. UniCAN
Send Registers
You can send a vector of values up to 16 integers long in a single Send function.
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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:
all controllers in the network will have 3 written into SI 201
123 written into SI 200, and SB 200 will be turned ON.
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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.
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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 , which provide a bitmap of all units in the UniCAN network, turns OFF.
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15. Thank You !
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