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BusWorks® Model 989EN U
ser’s Manual Modbus TCP/IP Digital I/O & Counters
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Acromag, Inc. Tel:248-295-0880 Fax:248-624-9234 Email:
29
Bit #:
Description of Error
Bit 16:
Input Read Fault (Walk 0)
– Read inputs command error
Bit 17:
Write/Read Mismatch
– Input did not match output (any failure)
I/O Self Test Page Help:
–
At the bottom of the Self Test function is a link to
a help page to provide error codes for the Self Test.
SYMPTO
M…
POSSIBLE CAUSE
POSSIBLE FIX
Green RUN LED Does Not Light…
Bad connections.
Recheck Power Connections
In3.3V power has failed or
a fatal processor (firmware) error
has occurred.
Return unit for repair.
Input Power TVS has failed. This
could occur for a sustained voltage
surge or continuous over-voltage
at the power terminals.
Return unit for repair. Power should
be fused externally or current-limited
to a safe operating level no less than
twice the maximum input current.
Input Wetting Currents are Low, or Not 2mA/16mA…
You are using less than 8V of
external excitation.
This is normal for excitation voltages
below 8V.
Continuous Flashing Green RUN LED…
Unit in “wink” mode.
Read Unit Status register to verify
“wink” status. Write 5555H to Wink
Mode Toggle Register to toggle wink
mode off/on.
Unit failed to boot firmware.
A continuously flashing green Run
LED can signify the unit has failed to
initialize and may require repair if you
are sure you are using a good
network connection and proper power
voltage.
WEB BROWSER
Utility Page
I/O Self Test Help Page
By clicking on the link at the
bottom of the Self Test
Control, a quick reference help
page will appear. This is
useful to obtain descriptions of
the error codes for the Self
Test.
To go back to the Utility Page,
scroll to the bottom of the Help
Page, and there will be a link
back. Alternatively, you can
click on the back button on
your internet browser.
TROUBLE-
SHOOTING
Diagnostics Table