ABB ACH580 Series User Manual page 105

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Serial communication diagnostics
Network problems can be caused by multiple sources. Some of these sources are:
• Loose connections
• Incorrect wiring (including swapped wires)
• Bad grounding
• Duplicate station numbers
• Incorrect setup of bypass or other devices on the network
The major diagnostic features for fault tracing on an EFB network include Group 58
EFB Protocol parameters 5808...5819. The
describes these parameters in detail. Group 58 applies to the drive external
communications. Group 50 applies to the bypass external communications.
Diagnostic situations
The sub-sections below describe various diagnostic situations – the problem
symptoms and corrective actions.
Normal operation
During normal network operation, 5808...5819 bypass parameter values act as
follows at each bypass:
• 5808 DV OK MESSAGES advances (advances for each application message
properly received and addressed to this drive).
• 5812 DV CRC ERRORS does not advance at all (advances when an invalid
message CRC is received).
• 5811 UART ERRORS does not advance at all (advances when character format
errors are detected, such as parity or framing errors).
• 5819 DV status value varies depending on network traffic.
• BACnet protocol: 5813 TOKEN CNT (MS/TP token counter) advances for each
token passed to this drive. (Does not apply for other protocols.)
Loss of communication
The action taken by the ABB E-Clipse Bypass, if communication is lost, is configured
in Communications
TIME. The
No master station on line
If no master station is on line: Neither the EFB OK MESSAGES nor the errors (5812
EFB CRC ERRORS and 5811 EFB UART ERRORS) increase on any of the
stations.
To correct:
• Check that a network master is connected and properly programmed on the
network.
• Verify that the cable is connected, and is not cut or short circuited.
Embedded fieldbus
ACH580 E-Clipse bypass and packaged drive user manual
fault. The parameters are 3004 COMM LOSS and 3005 COMM
Parameters section describes these parameters in detail.
Parameters section on page 59