T.5.12 Communication fails with part of the device connected to a CANopen master unit

Perform self-diagnosis in the case that the devices connected to a certain slave unit(s) communication fails.

Are the LEDs indicating an error?

Cause

The DeviceNet unit may not be properly connected, set, or the display unit may have a problem.

Solution

Solution Check the following LED status and correct the problem:

PWR LED status

Description

Green

On

When the CANopen board is conductive, this LED turns on.

Does not illuminate

When the CANopen board is nonconductive, this LED turns off.

Solution:

If the display unit supporting the CANopen master is on but this LED is off, the display unit may be faulty. Please contact your local distributor.


T.11.2 Telephone Contact

RUN LED status

Description

Green

Turns on once per second.

The device is in STOPPED state.

Turns on three times and then turns on again three times after 1 second has elapsed.

Initialization is in progress. The display unit supporting the CANopen master is now being initialized.

On

The device is in the OPERATIONAL State.

ERR LED status

Description

Red

Does not illuminate

The connected device is operating normally without errors.

Turns on once per second.

Communication data error

Check the connection devices (connector and cable in particular).

Alternatively, eliminate the influence of noise on the cable.

After checking the connection devices, perform a reset.

Turns on twice and then turns on again twice after 1 second has elapsed

Check the node ID and baud rates of the connection devices.

If this LED still turns on after the above solution has been taken, check the connection devices (connector and cable in particular).

After checking the connection devices, perform a reset.

On

The connected device is not connected to the bus.

Check the connection devices (connector and cable in particular). After checking the connection devices, perform a reset.

Blinking

The node ID address or communication settings are invalid.

The same node ID cannot be used more than once in the same network. Check if the node ID is duplicated.

The same communication speed must be set for devices in the same network. Check the communication speed settings.

Can the slave side receive data?

The slave side may be unable to perform communication.

Use the following procedure to check the slave status and determine the problem:

  1. Go to offline mode and touch [Peripheral Settings] on the item changeover switch.

  2. [Peripheral Settings] screen opens. Touch [I/O Driver] and then [CANopen Driver].

  3. [I/O Driver] screen opens. Touch [Slave Diagnostics].

  4. [Slave Diagnostics] screen opens. Touch to check the status of selected slaves. The numbers of slaves that are in the selected status are highlighted. (Example, One module is operating)