| 摘要 |
A system and method for limiting energy to an industrial control system is described. The method includes receiving a supply voltage, limiting the supply voltage so as to generate a limited voltage, and providing the limited voltage to a field transducer, the field transducer being disposed to monitor a parameter of the industrial process. A field current, that is generated in response to the limited voltage, is received from the field transducer and the field current is indicative of a magnitude of the parameter under normal operating conditions. During a fault condition, the field current is restricted with a variable resistance that is responsive to an amount of thermal energy generated during the fault condition so as to limit an amount of energy drawn by the control system.
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