초록 ▼

Low voltage logic circuitry is used to permit an entire subsystem of an industrial controller to be placed within a hazardous environment to receive a high speed serial link and undertake the control of multiple control points without expensive and awkward long cable runs and electrically isolating

Low voltage logic circuitry is used to permit an entire subsystem of an industrial controller to be placed within a hazardous environment to receive a high speed serial link and undertake the control of multiple control points without expensive and awkward long cable runs and electrically isolating circuits for each cable run. Energy and bandwidth limiting on the high speed link allows power levels commensurate with high data rates yet intrinsic safety of the media allowing it to freely pass in and out of the hazardous area. A mixture of intrinsically safe and non-intrinsically safe equipment on the same logical rack is allowed through a bus isolator providing isolated data communication in backplane fashion between modules while wholly isolating power transmission along the backplane.

대표청구항 ▼

[ We claim:] [1.] A network interface connecting components of an industrial controller communicating via electrical data signals comprising:an electrical conductor for communicating data signals between the components;a high pass filter positioned between a first component and the electrical conduc

[ We claim:] [1.] A network interface connecting components of an industrial controller communicating via electrical data signals comprising:an electrical conductor for communicating data signals between the components;a high pass filter positioned between a first component and the electrical conductor to attenuate low frequencies of a data signal to avoid the generation of sparks with sufficient energy to ignite a flammable atmosphere during a fault condition of the conductor;a power limiting circuit positioned between a first component and the electrical conductor and limiting the power of that signal to avoid the generation of sparks with sufficient energy to ignite a flammable atmosphere during a fault condition.