Page 218 - Sensors and Control Systems in Manufacturing

Fiber Optics in Sensors and Contr ol Systems

FIGURE 3.59 Photodyne 8000XG fi ber identifi er. (Courtesy 3M Corporation) 179

• Mechanically damped fiber action
• Operation over 850- to 1550-nm range
• Transmission direction indicators
• 1- and 2-kHz tone detection
• Low insertion loss at 1300 and 1550 nm
• Completely self-contained operation

3.18 Networking with Electrooptic Links
The following examples describe a number of products utilizing com-
munication through fiber electrooptic modules. The function of the
fiber is to replace wire. This can be achieved by interconnecting the
electrooptic modules in a variety of ways. Figure 3.60 shows a pro-
grammable controller communication network through a coaxial cable
bus branched to four remote input/output stations. The programma-
ble controller polls each of the input/output stations in sequence. All
input/output stations hear the programmable controller communica-
tion, but only the one currently being addressed responds.