FOXBORO P0912CB Communication card module

Single-point grounds, however, also become transmission lines at higher frequencies with earth being the other side of the line. In addition, every piece of equipment bonded to this transmission line will act as a tuned stub. In the presence of digital signals (square waves) the tuned circuits will ring at the specific frequencies to which they are resonant. Since single-point grounds behave as transmission lines at RF frequencies, they will have different impedances as a function of frequency, i.e., they may appear as inductors, capacitors, tuned circuits, insulators, or pure resistance, and therefore become extremely poor grounds. In a large installation, another major disadvantage of the single-point ground configuration is the requirement for long conductors. The long conductors prevent the realization of a satisfactory reference for higher frequencies because of large self-impedances. Further, because of stray capacitance between conductors, single-point grounding essentially ceases to exist as the signal frequency is increased.

Company advantages

Main brands: ABB, GE/FANC, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, Emerson, OVATION, MOTOROLA, XYVOM, Honeywell HONEYWELL, Rexroth, KUKA, NI, DEIF, Yokogawa, Woodward WOODWARD, Ryan, Schneider SCHNEIDER, Yaskawa, Moog, PROSOFT, etc

Application industry: widely used in metallurgy, oil and gas, glass manufacturing, aluminum, petrochemical, coal mine, paper and printing, textile printing, machinery, electronic manufacturing, automobile manufacturing, tobacco, plastic machinery, electricity, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, power transmission and distribution, etc.

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