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CT-7108     Supervised Contact Closure   Click for a larger image of Fiber Optic Contact closure
For Contact Closure or Status Monitoring Applications  

Block diagram of Supervised contact closure  

The CT-7108 transmitter and CR-7008 receiver system transmits supervised status of eight separate contact closures over a single optical fiber conductor.

To close a contact, the voltage at the CT-7108 input must be within predetermined range. Any voltage that differs from the predetermined values will result in an open contact condition at both the transmitter and companion CR-7008 receiver. If the CT-7108 loses power or the fiber is cut the CR-7008 contacts will open and alarm condition will be indicated.  For supervised contact closure monitoring that latches the current state if the fiber link is cut, see the CT/CR-7204.

All inputs are transient protected against excessive surges on the signal and power leads. Integral indicators are provided on both units to continuously indicate the link and contact closures status as well as proper operating power to simplify troubleshooting.

For unsupervised contact closure monitor see the CT/CR-7001 and CT/CR-7008.
 
 
Specifications Important Features
Number of Channels  8    · 8 Independent Contacts
Transmitter Input to close  2.91 and 3.70 volts          on One Fiber
Tx Input Impedance  2 K ohms +/- 1%  · Signal & Power & Link
Receiver Output  Relay Contacts         Indicators
Output Contact Rating  0.5 A @ 125 VAC
 1.0 A @ 24 VDC		  · Multimode & Single-mode
      Versions available
Output Contact carry current  2.0 A maximum  · Single model for stand
     alone or rack mount  
Output Contact Resistance  100 milliohms maximum  · Din Rail Mount Option
Speed of Response  10 ms maximum  
Optical Output Power  -15 dBm (multimode),
 -15 dBm (single-mode)		    
Optical Loss Budget  0-10 dB (multimode),
 0-12 dB (single-mode)		    
Signal Connectors  Removable terminal block
Power Requirements  11-24 VAC/DC @110mA
Operating Temperature -35 to +75 degrees C
Physical Size  5.0”(127)H  x 1.0"(25.4)W
     x 7.0"(178)L		    

*Note all specifications are subject to change without notice

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Liteway, Inc. 

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