| 摘要 |
<p>A process field device (104) for use in monitoring or controlling an industrial process includes first and second loop terminals (162, 164) configured to couple to a two- wire industrial process control loop (108). Field device circuitry (168) is configured to monitor or control a process variable of the industrial process. The field device circuitry (168) is powered by power connections from the two-wire industrial process control loop (108). A current regulator (220) is connected in series with the two-wire industrial process control loop (108), the first and second loop terminals (162, 164) and the field device circuitry (168). A voltage regulator (282) is connected in parallel with the current regulator (220) and in series with the two-wire industrial process control loop (108), first and second loop terminals (162, 164) and field device circuitry (168).</p> |
