Structure of a K-bus extension

WARNING

Risk of injury through electric shock and damage to the device!

Bring the Bus Terminals system into a safe, de-energized state before starting mounting, disassembly or wiring of the Bus Terminals!

Structure of a K-bus extension 1:
KL9020 and KL9050 in the Beckhoff Bus Terminal system

Mounting

When mounting, observe the information in the chapter entitled Mounting rail installation.

  1. Ensure that the system is powered down and in a safe state.
  2. Install the first bus terminal block, consisting of the fieldbus coupler and the desired Bus Terminals, on a mounting rail.
    Instead of a standard End Terminal (KL9010), install an End Terminal with RJ45 socket (KL9020) as the last terminal at the end of the first Bus Terminal block.
  3. Install the first expansion terminal block, consisting of a Coupler Terminal (KL9050) and the desired Bus Terminals, on a mounting rail.
    Install a standard End Terminal (KL9010) as the last terminal at the end of the first expansion terminal block.
  4. Connect one RJ45 plug of an Ethernet cable into the RJ45 socket of the KL9020 of the first bus terminal block until it clicks into place.
    Connect the other RJ45 plug of the Ethernet cable into the RJ45 socket (labelled IN) of the expansion terminal block Coupler Terminal (KL9050) until it clicks into place.
  5. Install the next expansion terminal block, consisting of a Coupler Terminal (KL9050) and the desired Bus Terminals, on a mounting rail.
    Install a standard End Terminal (KL9010) as the last terminal at the end of this expansion terminal block.
  6. Connect one RJ45 plug of an Ethernet cable into the RJ45 socket (labelled OUT) of the KL9020 of the previous expansion terminal block until it clicks into place.
    Connect the other RJ45 plug of the Ethernet cable into the RJ45 socket (labelled IN) of the KL9050 of the added expansion terminal block until it clicks into place.
  7. Repeat steps 5 and 6 in order to connect further expansion terminal blocks. A maximum of 31 expansion terminal blocks can be connected.
  8. Set the Function Switch on all Coupler Terminals (KL9050) correctly.

Function Switch

Structure of a K-bus extension 2:
KL9050 - Function Switch

CAUTION

Danger to persons, the environment and equipment

  • Correct setting of the Function Switches of all Coupler Terminals (KL9050) within a K-bus extension system must be ensured!
  • Correct setting of the Function Switches must also be ensured if Coupler Terminals (KL9050) are replaced!
  • Please note that all extension terminal blocks connected after a Coupler Terminal (KL9050), whose Function Switch is set to the Last position, are not included correctly in the process image! This means:
  1. The inputs of these terminals are not visible in the process image!
  2. The outputs of these terminals are not controlled by the process image!
  • The Function Switch may be set to the Last position only at the last Coupler Terminal (KL9050) of the K-bus extension system!

Notes on the topology

Structure of a K-bus extension 3:

Notes on the connection of the KL9020 and KL9050 terminals

The end terminal with RJ45 socket (KL9020) may only be used at the end of Bus Terminal blocks that are opened by a fieldbus coupler! All extension terminal blocks must be terminated by a KL9010 standard end terminal!

At least one terminal with process image must be connected to each KL9050 Coupler Terminal! The operation of an extension terminal block with only one KL9010 (with no inputs or outputs) is not permissible

Disassembly

When mounting, observe the information in the chapter entitled Mounting rail installation.

  1. Ensure that the system is powered down and in a safe state.
  2. Press the plastic lock of the RJ45 plug and pull it from the socket.
  3. Carefully pull the orange-colored lug approximately 1 cm out of the terminal to be disassembled, until it protrudes loosely. The lock with the C mounting rail is now released for this terminal, and the terminal can be pulled from the mounting rail without excessive force.
  4. Grasp the released terminal with thumb and index finger simultaneous at the upper and lower grooved housing surfaces and pull the terminal away from the mounting rail.