Using tweezers, remove the plug-in power fuse and check it for
continuity with an ohmmeter. If the fuse is blown, replace it with a
similar 5 Amp fuse (it resides in a socket).
Unit Appears Functional But Is Not Responding
If the CPU LED is blinking normally, chances are the unit is
operational. However, because the ACX series controller is a
programmable unit, it is possible that there is a programming problem.
Monitoring Status LED Activity
You can monitor field bus and Ethernet communications by observing
the status of the TX (transmit), RX (receive), and Ethernet ACT/LINK
LEDs on the front placard. During communications, these LEDs should
show activity. For more information, see “System LEDs” on page 128.
Resetting the Controller
If the ACX controller seems to be non-responsive and all other attempts
to revive it fail, you can use two buttons to perform the following
functions:
z
Clear Memory — Button on the ACX controller placard that
restores configuration settings saved previously in flash memory.
For more information on the Clear Memory button, see “Clear
Memory Button” on page 129.
z
Reset IP — Button on the printed circuit board that restores the
ACX controller’s user name, password, and configuration settings
to the original factory values (using a two stage operation). For
more information on the Reset IP button, see “Using the Reset IP
Button” on page 136.
