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          Programmable ControllerKV-8000 series

          Serial communication unit, 2 ports (RS-422A/485×2)



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          Serial communication unit

          Communication standard

          RS-422A / RS-485 (4 wires), RS-422A / RS-485 (2 wires)

          Connection interface

          European terminal block with 5 poles(detachable) × 2 ports

          Transmission specification

          Electrical termination (Terminator)

          ON / OFF set by the switch on the front face

          Transmission rate

          1,200, 2,400, 4,800, 9,600, 19,200, 38,400, 57,600, 115,200, 230,400 bps

          Transmission method

          RS-422A / RS-485(4 wires): Full duplex, RS-422A / RS-485(2 wires): Half-duplex

          Data format

          Start bit: 1 bit
          Data bit: 7 or 8 bits
          Stop bit: 1 or 2 bits

          Error detection

          Parity: Even, odd, none

          RS/CS flow control

          ON or OFF(only in PLC link mode)

          Transmission distance

          Total extension: 1,200 m max.*2*3

          Number of transmission units


          Connectable CPU units

          KV-7500 / 7300


          Automatic refresh, direct refresh,inter-unit synchronisation refresh

          Serial communication functions

          Non-procedure, PROTOCOL STUDIO, Modbus RTU slave, etc.

          Serial communication function execution methods

          Ladder program, unit program (flow)

          Unit program capacity

          3 MB (max. number of blocks: approx. 20,000)


          Maximum number of flows


          Number of simultaneous activities


          Internal data memory

          524,288 words


          Transmission method

          Cyclic communication: Tx + Rx, Tx only, Rx only
          Event communication: Tx + Rx, Tx only, Rx only, Tx + Continuous Rx, Break Tx

          Maximum number of connected devices


          Maximum number of communication commands

          48 / 96*4

          Maximum number of total frames

          Rx: 48 / 96*4 × 16;
          Tx: 48 / 96*4 × 1

          Maximum number of compared and receive frames

          16 per command

          Maximum number of block elements

          96 per frame

          Transmission data length

          1 to 2,048 bytes per frame

          Received data length

          PLC link

          Communication patterns

          Write, read, transfer

          Number of link settings

          512 settings max.*5

          Link data size

          1,440 words max. per setting (bit: 720 words, word: 720 words)
          737,280 words max. (total)(1,440 words × 512 settings)

          Data unit

          1 word

          Number of connected models

          2 models max.(1 model × 2 ports)

          Number of connected units

          2 max.(1 unit × 2 ports)

          Trigger types

          Cyclic / event (64 settings max. for event*5)

          Update interval

          10 to 65,535 ms

          Internal current consumption

          150 mA or less


          Approx. 190 g

          *1 For KV-8000/KV-7000 Series
          *2 Depends on the function to be used.
          *3 The total extension is 500 m max. at a transmission rate of 230,400 bps. The transmission rate and distance vary depending on the device to be connected. Check the values according to the actual device.
          *4 The max. is 48 when “Standard” is set for the number of communication commands on the Unit Editor and 96 when “Extended” is set.
          *5 Total for one KV-XL202 / XL402 unit.

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