Unitronics Vision OPLC V1040-T20B User Manual page 10

Vision™ OPLC™ V1040-T20B
CANbus
These controllers comprise a CANbus port. Use
this to create a decentralized control network using
one of the following CAN protocols:
▪ CANopen: 127 controllers or external
devices
▪ CANLayer 2, J1939
▪ Unitronics' proprietary UniCAN: 60
controllers, (512 data bytes per scan)
The CANbus port is galvanically isolated.
CANbus Wiring
Use twisted-pair cable. DeviceNet® thick shielded
twisted pair cable is recommended.
Network terminators: These are supplied with the
controller. Place terminators at each end of the
CANbus network.
Resistance must be set to 1%, 121Ω, 1/4W.
Connect ground signal to the earth at only one
point, near the power supply.
The network power supply need not be at the end
of the network
CANbus Connector
10
Power Supply
-
-V
L
PE
H
+V
-V
L
PE
H
+V
-V
L
PE
H
+V

121
terminating
resistor
Installation Guide
+
Circuit
protection
device

121
terminating
resistor
Unitronics