Faults And Alarms Related To The Devicenet Communication; A133/F233 - Can Interface Without Power Supply; A134/F234 - Bus Off; A136/F236 - Idle Master - WEG DeviceNet CFW500 User Manual

6 FAULTS AND ALARMS RELATED TO THE DEVICENET
COMMUNICATION
A133/F233 – CAN INTERFACE WITHOUT POWER SUPPLY
Description:
It indicates that the CAN interface does not have power supply between the pins 1 and 5 of the connector.
Actuation:
In order that it be possible to send and receive telegrams through the CAN interface, it is necessary to supply
external power to the interface circuit.
If the CAN interface is connected to the power supply and the absence of power is detected, the alarm A133 –
or the fault F233, depending on the P0313 programming, will be signalized through the HMI. If the circuit power
supply is reestablished, the CAN communication will be reinitiated. In case of alarms, the alarm indication will
also be removed from the HMI.
Possible Causes/Correction:
Measure the voltage between the pins 1 and 5 of the CAN interface connector.

Verify if the power supply cables have not been changed or inverted.

Make sure there is no contact problem in the cable or in the CAN interface connector.

A134/F234 – BUS OFF
Description:
bus off
The error in the CAN interface has been detected.
Actuation:
If the number of reception or transmission errors detected by the CAN interface is too high
bus off
can be taken to the
In this case the alarm A134 – or the fault F234, depending on the P0313 programming, will be signalized
through the HMI. In order that the communication be reestablished, it will be necessary to cycle the power of
the product, or remove the power supply from the CAN interface and apply it again, so that the communication
be reinitiated.
Possible Causes/Correction:
Verify if there is any short-circuit between the CAN circuit transmission cables.

Verify if the cables have not been changed or inverted.

Verify if all the network devices use the same baud rate.

Verify if termination resistors with the correct values were installed only at the extremes of the main bus.

Verify if the CAN network installation was carried out in proper manner.

A136/F236 – IDLE MASTER
Description:
It is the alarm that indicates that the DeviceNet network master is in the
Actuation:
It acts when the CFW500 detects that the network master went to the
variables read from the slave continue being updated in the memory of the master. None of the commands sent
to the slave is processed.
9 For more information on the error detection, refer to the CAN specification.
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state, where it interrupts the communication and disables the CAN interface.
, the CAN controller
9
Idle
mode.
Idle
mode. In this mode, only the