ACS510 User’s Manual
153
Embedded Fieldbus
Diagnostic Situations
The sub-sections below describe various diagnostic situations – the problem
symptoms and corrective actions.
Normal Operation
During normal network operation, 5306…5309 parameter values act as follows at
each drive:
• 5306
EFB
OK
MESSAGES
advances (advances for each message properly received
and addressed to this drive).
• 5307
EFB
CRC
ERRORS
does not advance at all (advances when an invalid
message CRC is received).
• 5308
EFB
UART
ERRORS
does not advance at all (advances when character format
errors are detected, such as parity or framing errors).
• 5309
EFB
STATUS
value varies depending on network traffic.
Loss of Communication
The ACS510ACS510 behavior, if communication is lost, was configured earlier in
"Communication Fault". The parameters are 3018
COMM
FAULT
FUNC
and 3019
COMM
FAULT
TIME
. The "Complete Parameter Descriptions" section describes these
parameters in detail.
No Master Station on Line
If no master station is on line: Neither the
EFB
OK
MESSAGES
nor the errors (5307
EFB
CRC
ERRORS
and 5308
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 that it is not cut or short circuited.
Duplicate Stations
If two or more stations have duplicate numbers:
• Two or more drives cannot be addressed.
• Every time there is a read or write to one particular station, the value for 5307
EFB
CRC
ERRORS
or 5308
EFB
UART
ERRORS
advances.
To correct: Verify the station numbers of all stations. Change conflicting station
numbers.
Swapped Wires
If the communication wires are swapped (terminal A on one drive is connected to
terminal B on another):
• The value of 5306
EFB
OK
MESSAGES
does not advance.
• The values of 5307
EFB
CRC
ERRORS
and 5308
EFB
UART
ERRORS
are advancing.
To correct: Check that the RS-485 lines are not swapped.
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