The PLC is the central memory and calculating unit of ABUControl. It is installed in the trolley control. The PLC in Trolley 1 is the central memory and calculating unit for cranes with several trolleys.

A faulty PLC can be removed and replaced as an individual module.

The programming of PLC consists of two parts:

─     The ABUS firmware (basic operating software) is permanently saved in the PLC.

─     The application (ABUS crane software), the customer-specific configuration (individual settings of the crane installation) as well as the KranOS are saved on an SD card.

Only a PLC using ABUS firmware may be used for replacement. The application and customer-specific configuration are transferred with the SD card.

If the PLC in Trolley 2 and Trolley 3 both need to be exchanged, first the faulty PLC in Trolley 2 must be removed, the new PLC installed and the application and configuration transferred by the PLC of Trolley 1.. Only then should the faulty PLC of Trolley 3 be removed, the new PLC installed, and the application and configuration transferred.

The PLC in Trolley 2 and Trolley 3 also contain an SD card, however only a few basic data are saved here. The SD card in Trolley 2 and Trolley 3 do not have to be taken into consideration during the replacement.

For this work step, access from a laptop or tablet computer to KranOS is necessary. The user "Abnahme" (commissioning) (user level ‚[2]) must be logged in.

The consumed full-load hours from the load population recorder must be read before the removal of the faulty PLC.

Log in as user "Abnahme" (commissioning) (user level [2]) in KranOS. See Connecting laptop or tablet computer with ABUControl, page  .

Select the desired hoist (e.g. Hoist 1) in the main menu.

●   The window for the requested hoist appears.

Click on the "Hoist calibration" menu item in the "Settings" menu (gear wheel on yellow background).

●   The "Hoist calibration" window appears.

Note the value in the "Consumed value" description field in the "Load population recorder" line.

Switch off the crane. See Switching off the crane.

Take out the faulty SD card from the PLC.

Remove or disconnect connection cables from the faulty PLC.

Dismantle faulty PLC.

On the new PLC:

The terminating resistor at the PLC must be in principle be switched off.

Set the sliding switch for the terminating resistor on the new PLC to "off".

For further details about the terminating resistor: See Setting the terminating resistor in the CAN bus network.

Install the PLC.

Plug in or connect the connection cables again.

Insert the SD card into the new PLC.

Switch the crane on.

●   For PLC in Trolley 1: The PLC recognises the application and configuration on the SD card and transfers the data from the SD card.

For PLC in Trolley 2 or Trolley 3: The PLC of Trolley 1 finds the new PLC from Trolley 2 or 3 in the CAN bus network and transfers the application and configuration. The SD cards in Trolley 2 and Trolley 3 do not have to be taken into consideration any longer.

For further details about data backup and restoration: Performing data backup and restoration of the customer-specific configuration‚ [2], page  .

After installation, the consumed full-load hours must be input as the start value of the load population recorder.

Log in as user "Abnahme" (commissioning) (user level [2]) in KranOS. See Connecting laptop or tablet computer with ABUControl, page  .

Select the desired hoist (e.g. Hoist 1) in the main menu.

●   The window for the requested hoist appears.

Click on the "Hoist calibration" menu item in the "Settings" menu (gear wheel on yellow background).

●   The "Hoist calibration" window appears.

In "Load population recorder" line, enter the previously noted value (see Reading the load population recorder) in the "Start value" input field.

Click on the "Write PLC" button.