Loop Controllers Product Focus Study October 2003
Among those specifying, recommending, and/or buying stand-alone loop controllers, 75% do so for in-plant requirements and 35% do so for OEM requirements.
electronic multiple-loop controllers, with an average of 21 being used.
Respondents required the highest number of I/O channels in PC-based controllers, with an average of 19 for this type of controller. For analog inputs, PC-based controllers remained the most required, with an average of 19 being needed. Results also suggest that both PCbased controllers and electronic single-loop controllers required an average of 15 I/O channels in analog outputs. In both discrete inputs and discrete outputs, PC-based controllers also required the most I/O channels.
Eighty-nine percent of respondents stated they use 4-20 mA with controllers to field instrumentation. Seventy-one percent reported using Ethernet with controllers to enterprise systems.
Thirty percent of respondents purchased stand-alone loop controllers [or other devices to provide that function] from Rockwell Automation/Allen-Bradley in the past 12 months. Twenty-four percent have purchased from Honeywell.
was how they selected a stand-alone loop controller.
One-fifth of respondents check daily if their stand-alone Loop Controllers are running in open or closed loop.
Over half of the respondents say that with most loop controllers, they program and configure on the loop controller itself. Thirty-eight percent usually program and configure by connecting to the device locally.
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