26SI Series Alternator – CAN Extension Bridge

Problem-Remote CAN Network receives no data from Local CAN Network

Probable Cause

  1. Confirm the PL1000T Communications ECM is properly connected to system power. Confirm that Batt+ is applied to the key switch circuit.
  1. Confirm all devices on the CAN networks that are connected to the PL1000T are functioning properly. Confirm all devices on the CAN networks that are connected to the PL1000T are configured for 250K baud rate.
  1. Confirm the CAN “Extension Bridge Function Enable Status”, that is displayed on the PL1000T “Configuration” screen, is configured to “Enabled”.
  1. Connect to Caterpillar Communication Adapter. Confirm that each device is detected that is on the logical CAN network and that is connected to the “CAN Port 1” of each PL1000T.
  1. If no devices are detected, connect the Comm Adapter II to one of the physical CAN networks connected to either of the PL1000T ECMs.
    1. Confirm that the devices are detected that are connected to that network. If no devices are detected, then the harnessing must be analyzed and repaired.
    1. If devices are detected, then connect the Comm Adapter II to the other physical CAN network of the other PL1000T. Confirm that the devices are detected that are on that physical network. If no devices are detected, then the harnessing must be analyzed and repaired.
    1. If all devices are detected in both previous connections, then the RS-485 harnessing should be analyzed and repaired.

Problem-Remote CAN Network receives partial data from Local CAN Network

Probable Cause

  1. Confirm all devices on the CAN networks that are connected to the PL1000T are functioning properly. Confirm all devices on the CAN networks that are connected to the PL1000T are configured for 250K baud rate.
  1. Using the Communication Adapter, start the service tool and confirm that the devices connected to “CAN Port 1” of each PL1000T ECM are detected. If some of the devices are not detected, the harnessing that is on that CAN port must be analyzed and repaired.
  1. Use Cat service tool in order to monitor the “CAN Extension Bridge Statistics” screen. The number of messages received on “CAN Port 1” should increment at approximately the same rate as the number of messages transmitted on “CAN Port 2”. A potential cause of receiving partial data is an intermittent harness failure. An intermittent harness failure will cause the two messaging counters to become dissimilar over a short time.

Problem-Excessive data latency from Local to Remote CAN Network

Probable Cause

  1. Disable all other PL1000T ECM features. Observe the data flow. If the data flow has improved, the CAN buss loading is excessive. An additional PL1000T ECM must be used in the system in order to implement the other desired features. If the PL1000T ECM is used in order to connect two separate CAN busses, data flow could be improved with separate PL1000T ECMs. Separate PL1000T ECMs would provide the “CAN Extension Bridge” for each network.
  1. The possibility exists that high CAN buss loading may exceed the processing ability of the PL1000T ECM. The CAN buss loading must be analyzed and reduced if possible.