Operation Switches - Allen-Bradley 1779-KFMR User Manual

Chapter 5
Operation and Troubleshooting

Operation Switches

5 4
The interface has three switches on its front panel for you to use in
operating the interface (Figure 5.1).
AC POWER Switch
EXIT REQUEST Switch
TEST/RUN/RESET Switch
AC Power Switch
The AC POWER switch is a toggle switch. In the ON position, this
switch connects power from the input power terminals, through the fuse,
to the power-supply circuits. With the proper voltage level of AC power
connected to the power-supply circuits through the AC POWER switch,
the interface turns on the AC POWER ON indicator.
EXIT REQUEST Switch
The EXIT REQUEST switch is a push-button switch. When you press
this switch, the interface sends out a signal to the other nodes of the Data
Highway II link that it no longer wants to be included in the logical ring.
After accomplishing this exit, the interface turns on the EXIT
COMPLETE indicator. From then on until the interface is reset, the other
nodes will not attempt to pass on the token to this node. Press the EXIT
REQUEST switch before turning off power or switching out of RUN
mode. If you don't press this switch before turning off interface power or
switching out of the RUN mode, there may be a momentary delay
(possibly several seconds) in communication between the other stations
until they rebuild the ring.
TEST/RUN/RESET Switch
The TEST/RUN/RESET switch is a three-position toggle switch which
controls the operation mode of the interface. TEST and RUN are
stationary contact positions. RESET is a momentary contact position.
To change switch position, you must first pull out on the switch handle.
This feature guards against switching out of the RUN mode inadvertently.
To switch to TEST mode, first switch to RESET momentarily. In TEST
mode, the interface continuously executes self-diagnostic tests. Each test
cycle lasts approximately 50 seconds. During these tests, the NODE
TEST and MAC TEST indicators turn ON and the
IN-RING/SEEKING-MEM and DUP ADDR indicators flash rapidly.