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2.3 Gateway Unit Alarm Causes and Countermeasures
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Alarm
code
Alarm name Causes/countermeasures
A7
(8A7)
External wiring power
supply voltage drop
Cause: Gateway unit control power supply voltage has dropped to or
below 16.8 V (70% of 24 VDC).
1) Control power supply voltage drop
2) Malfunction of parts inside the gateway unit
Countermeasure: 1) Confirm that voltage of 24 VDC ± 10% is being
applied to the gateway unit control power
connector. If the voltage is low, the 24 VDC
power supply may have failed.
2) Contact IAI.
BA
(8BA)
Number of
axes/operation mode
mismatch
Cause: 1) Number of axes set with gateway parameters does not
match the number of axes calculated from the operation
mode set for the gateway.
2) Driver units of 17 axes or more are connected.
Countermeasure: 1) As the parameter set value is incorrect, reset the
gateway parameters.
2) Reduce the driver units to 16 axes or fewer and
set the appropriate gateway parameters.
BC
(8BC)
Attached axis
communication error
Cause: Communication error generated at total frame
communication initial communication.
1) Connector or SCON cable connector is not correctly connected.
2) Interior signal line or SCON connection cable is disconnected.
3) Terminal unit or terminal connector (for SCON) has not
been mounted.
4) Communication error due to noise
Countermeasure: 1) 2) Confirm that units are firmly connected
together. Disconnect the units and then connect
them again. Contact IAI if this reoccurs even
after turning ON the power again.
3) Mount the terminal unit or terminal connector.
4) Take measures against noise, such as changing
cable arrangements.
BE
(8BE)
Option Unit Initial
Communication Error
Cause: There was a communication error occurred at initial
communication of the total frame communication to the
option unit (EC connection unit).
1) Connector is not correctly connected.
2) Interior signal line cable is disconnected.
3) Terminal unit has not been mounted.
4) Communication error due to noise
Countermeasure: 1) 2) Confirm that units are firmly connected
together. Disconnect the units and then connect
them again. Contact IAI if this reoccurs even
after turning ON the power again.
3) Mount the terminal unit
4) Take measures against noise, such as changing
cable arrangements.
D0
(8D0)
Option Unit Connected
Number of Units Error
Cause: The number of units connected to the option unit (EC
connection unit) differs from the number of connected units
set in the gateway parameter.
Countermeasure: Align the number of option units in the setting to the
number of connected units.
D1
(8D1)
Inapplicable Option Unit
Connected
Cause: An option unit not applicable was connected.
Countermeasure: Connect an option unit that is applicable.