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Title: Communication System For Gas Measurement Data
Author: Royce Miller
Source: 2007 International School of Hydrocarbon Measurement
Year Published: 2007
Abstract: Todays market offers a variety of communications systems ranging from simple to complex. Making the best choice can mean the difference between success and failure. This discussion will focus on the connectivity between the SCADA server (Master Terminal Unit), Remote Terminal Units (RTU), Electronic Flow Meter (EFM) and Programmable Logic Controller (PLC). Common practice is to remotely locate the SCADA server in a data center or business office. This location is usually located away from any production field or pipeline. This practice can create demands on connectivity options. Recurring cost must be controlled while providing the service that customers demand. Managing this connectivity must be well documented and maintained. This can be a difficult task when many locations are isolated in hard to reach locations. This task may seem impossible but the reality is that we dont have to choose a single option for all needs. In fact the more complex systems usually rely on numerous connectivity methods. Some of the options are described here. When choosing from the available options SCADA server connectivity must be considered. The options fall into 2 groups: circuit switched and networked. Broadband is generally desirable between the SCADA server and the production area but not usually required at the production field or pipeline, see the Typical SCADA Network Topology drawing below Fig #1. Dial up modems can be very costly and mainly used on small systems when the setup time for the modem/call is not critical. Monthly recurring cost and long distance/toll charges limit the usefulness of this option. Microwave and dedicated leased line are still options but economically not favorable. Dedicated T1, DSL, cable modem, satellite internet or wireless ISP and Ethernet radio offer benefits for the SCADA server.

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