By Architecture Technology Corpor. (Auth.)
Please be aware this can be a brief ebook. manufacturing facility communications as an issue and a know-how rely on sector networks, even if neighborhood (LAN) or extensive (WAN). consequently, a wide part of this file covers such networking. moreover, manufacturing facility Communications covers the diversity of manufacturing facility automation units, together with computers, PLCs, I/O units, and software program. information trade and cabling are different features of manufacturing unit communications which are lined during this record
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Usually, the functions are distributed among the software components resident in the network's various programmable hardware components. 7 Turnkey Systems In planning a turnkey system, the development of an RFP is based on the system requirements specification. Vendor RFP responses are evaluated in a straightforward fashion against system requirements. Final selection is based on more than just RFP responses and product demonstrations, however. Other important evaluation criteria include the vendor's market share, size, reputation, experience, reliability in delivering newly announced products, and ability to survive market shakeouts.
2 External, Serially Connected I/O I/O module systems that interface to the CPU over a serial connection are cost-effective for long distance communications, because fewer wires are required. However, serial connections for remote transmission of I/O signals generally have lower data rates than backplane transfer, for two reasons: (1) the data is serial rather than parallel and (2) the systems must be designed to reject noise pickup in the factory. The latter often requires additional bits of data to check for valid data transmission.
When there are many monitoring points and control devices in a field location, a multi-unit cabinet can be used to house single channel I/O modules. These cabinets may represent a lower-cost approach compared 35 Factory Communications Area 1 RTD input from boiler to 4-20 mA output valve Frequency input from flow meter I/O module from computer I/O module (to computer) I/O module (to computer) I/O module from computer RS-485 data link (up to 10,000 ft) Area 2 1-5 V input from motor 0-1OV output to pump 1-5 V output to pump Area 4 I/O module (to computer) Personal computer (PC) or other RS^85 host I/O module from computer I/O module from computer -Contact closure - inputs/outputs Area 3 Area 5 0-1 mA input from — power transducer I/O module from computer I/O module (to computer) ^4-20 mA output to valve Figure 10: Distributed I/O Modules to the traditional I/O rack cabinet that contains more hardware and wiring and is usually available in a minimum configuration of eight or 16 channels per rack slot.