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Star and daisy chain network structures can be combined to minimize overall cabling costs (Fig. 3.64). The fiber network configuration exactly duplicates the coax network. The final decision on exactly which configuration to choose depends on the following criteria: Economical cabling layout Length of cable runs versus cost of electronics Location of end devices and power availability Power-out considerations Other considerations specific to the programmable controller being used can be summarized as follows: Pulse-width. Total acceptable pulse-width distortion, which may limit the number of allowable repeater sites, is Allowable distortion (ns) = allowable percent distortion period of signal (ns)
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FIGURE 3.64
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Signal propagation delay. Allowable system signal propagation delay may limit the overall distance of the fiber network.
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Example. Electrooptic module distortion = 50% allowable distortion 1 Mbaud transmission = 50 ns Calculate: Allowable distortion = 50% allowable distortion 10 6 = 500 ns Maximum number of repeater sites = 500 ns/50 ns = 10
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NOTE : A star coupler counts as a repeater site.
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Distance Calculation (Signal Propagation Delay) Delay of light in fiber-optic regeneration 1.5 ns/ft Delay in module 50 ns Manufacturers of programmable controllers will provide the value of the system delay. This value must be compared with the calculated allowable delay. If the overall fiber system is longer than the published maximum length of the wired system, the system must be reconfigured.
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FIGURE 3.65 Minicell controller.
Fiber-Optic Sensory Links for Minicell Controllers
A minicell controller is typically used to coordinate and manage the operation of a manufacturing cell, consisting of a group of automated programmable machine controls (programmable controllers, robots, machine tools, etc.) designed to work together and perform a complete manufacturing or process-related task. A key benefit of a minicell controller is its ability to adjust for changing products and conditions. The minicell controller is instructed to change data or complete programs within the automation work area. A minicell controller is designed to perform a wide variety of functions such as executing programs and data, uploading/downloading from programmable controllers, monitoring, data analysis, tracking trends, generating color graphics, and communicating in the demanding plant floor environment. Successful minicell controllers use fiber-optic links that can interface with a variety of peripheral devices. A minicell controller can be used in a variety of configurations, depending on the optical-fiber lengths, to provide substantial system design and functional flexibility (Fig. 3.65).
3.19 Versatility of Fiber Optics in Industrial Applications
A constant concern in communication is the ever-increasing amount of information that must be sent with greater efficiency over a medium requiring less space and less susceptibility to outside interferences.
Fiber Optics in Sensors and Control Systems
As speed and transmission distance increase, the problems caused by electromagnetic interference, radio frequency interference, cross talk, and signal distortion become more troublesome. In terms of signal integrity, just as in computer-integrated manufacturing data acquisition and information-carrying capacity, fiber optics offers many advantages over copper cables. Furthermore, optical fibers emit no radiation and are safe from sparking and shock. These features make fiber optics the ideal choice for many processing applications where safe operation in hazardous or flammable environments is a requirement. Accordingly, fiber-optic cables offer the following advantages in industrial applications: Wide bandwidth Low attenuation Electromagnetic immunity No radio frequency interference Small size Light weight Security Safety in hazardous environment
High-Clad Fiber-Optic Cables
Large-core, multimode, step-index high-clad silica fiber-optic cables make fiber-optic technology user-friendly and help designers of sensors, controls, and communications realize substantial cost savings. The coupling efficiency of high-clad silica fibers allows the use of less expensive transmitters and receivers. High-clad silica polymer technology permits direct crimping onto the fiber cladding. Field terminations can be performed in a few minutes or less, with minimal training. The following lists describe the structure and characteristics of several fiber-optic cables used in industry. Simplex fiber-optic cables (Fig. 3.66) are used in: Light-duty indoor applications Cable trays Short conduits
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