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4. Operation
The Fiber Optic Network Access Control A/B Switch uses a non-latching optical switching mechanism to
direct the light beams between the Common Port and Port A or Port B. There's no optical-to-electrical
conversion. The only electrical activity is the DC power required to move the precision mirror mechanism
and to power the LEDs. A set of non-latching relay contacts are also provided at the terminal block for
remote status. Sinc e non-latching switching mechanisms are used, if power is removed or lost the switch
automatically reverts to the Common Port to A Port connection state (the status contacts likewise
automatically change state if appropriate).
To operate the switch simply apply power to the unit by providing a source of AC voltage to the wall
mount power supply. If power is applied and either the override switch is ON or the terminal block Active
contact is shorted to the Ground contact, then the switch will be in the active state (Port B connected to the
Common Port). The switch is in the inactive state (Port A connected to the Common Port) if power is
removed, or if both the override switch is in the OFF position and the terminal block Active contact is not
connected to the Ground contact. (See table below)
Connection
Power
State
Port A to
OFF
Common
Port A to
ON
Common
Port B to
ON
Common
Port B to
ON
Common
The Fiber Optic Network Access Control A/B Switch has been designed so that it can be easily driven
using the remote status dry contact closures from Market Central's SecureSwitch Fiber Optic A/B/C Switch
Revision B product. In the example shown below, when the PLC Controller switches the Rev B
SecureSwitch to port B, the remote status dry contact outputs B-B on the SecureSwitch Rev. B unit will
close, causing the Fiber Optic Network Access Control A/B Switch to optically connect its Common Port
to its B Port.
1U Rackmount, Single FONAC A/B Switch, with SC connectors
Override
Remote
Switch
Contact
X
X
OFF
OPEN
ON
X
X
CLOSED
Page 4
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