Ci-AA21/DD21/OO21 Series

CAN / CANOpen / DeviceNet Redundant Link Module

Support CAN 2.0A and CAN2.0B communication rate
Support DeviceNet, CANOpen bus protocol
Converts non-redundant line to two redundant lines
DIP switches for setting communication rate or rate adaptive
3 CAN Bus ports with photon-coupled isolator
120 Ohm termination resistor enabled by DIP switch
Support alarm output for fieldbus ports errors
DC9-36V dual redundant power input
IP40 protection rating, Metal case, 35mm DIN-Rail Mounting
Support -40~75℃ wide operating temperature range
Overview Specifications Models Resources

Overview of CAN / CANOpen / DeviceNet Redundant Link Module

This product is a Fieldbus Link Redundant Module for CAN bus. It realizes the mutual conversion of single bus and double redundant bus. Field devices equipped with only a single CAN bus interface, can be integrated in the redundant CAN bus network by using the Redundancy Link Module. Acting like an active switch, it converts two redundant lines to one CAN line or vice versa.
The Link Redundant Module amplifies signal form and amplitude of the incoming data and monitors activities and error statuses of all three lines.
The series conforms to the fieldbus based on the CAN2.0A/B protocol, such as CAN, DeviceNet, CANOpen, SDS, NMEA2000, SAE J1939, SAE J2284, the rate is set by the DIP switches (recommended) or the selection rate adaptive setting.
The product is industrial grad designed, casing: IP40 protection, DIN rail mounting, DC (9~36V) power input, support ports error alarm output, dual redundant power input and isolation protection. -40~75°C Operating Temperature, can meet various Industrial situation.

Specifications of CAN / CANOpen / DeviceNet Redundant Link Module

Serial Port Interface form: 5.08mm pitch terminal blocks
In line with the recommendations of the organization of CiA and ODVA
Support CAN/DeviceNet/CANOpen bus standard
Baud Rates: DeviceNet/CANOpen full rate adaptation, up to 1Mbps
Isolated voltage 1KV, 4KV Anti-thunder protection
DIP switche is used to enable 120 Ohm termination resistor
Power Supply
      DC (9~36V) dual redundant power input
      Industrial standard voltage DC 24V, Consumption is less than 4W
      DC 1500V voltage isolation and reverse connect protection
    5.08mm pitch terminal blocks
      Relay: Fieldbus ports error Relay alarm output

    Contact rating: 1A @24V DC, Industrial Terminal port
      Dimensions (H×D×W): 136mm×104.8mm×52.8mm

      Weight: 800g

      Casing: IP40 protection, wave grain aluminum reinforce case option

      Installation: Wall mounting or DIN rail mounting


      Operating Temperature:-40℃~75℃(-40℃~85℃ optional)

      Storage Temperature: -40℃~85℃

      Ambient Relative Humidity: 5%~95%(non-condensing)


    IEC61000-4-2 (ESD): Power ±2KV Contact, ±15KV Air
      Relay ±2KV Contact, ±15KV Air; Data Cable ±15KV Air
      IEC61000-4-4 (EFT):Power ±4KV, Data Cable ±4KV
      IEC61000-4-5 (Surge):Power ±2KV CM/ ±1KV DM, Relay±2KV CM/ ±1KV DM
      IEC60068-2-27 (Shock)
      IEC60068-2-32 (Free Fall)
      IEC61000-6-2 (General Industrial Standard)
Warranty 5 years

Models of CAN / CANOpen / DeviceNet Redundant Link Module

Available Models



CAN2.0A/B bus link redundancy module, 1 M port (CAN3), 2 redundant bus A (CAN1), B (CAN2) port


DeviceNet bus link redundancy module, 1 M port (CAN3), 2 redundant bus A (CAN1), B (CAN2) port


CANOpen bus link redundancy module, 1 M port (CAN3), 2 redundant bus A (CAN1), B (CAN2) port





  Ci-AA21/DD21/OO21 Series Datasheet 



  Ci-AA21/DD21/OO21 Series Quick Installation Guide