FOXBORO FCM100E CPU controller

It is again emphasized, however, that care must be taken not to create loops that can couple signals from one system to another. c. Design considerations. The design of an effective signal reference subsystem depends upon properly identifying the range of signal frequencies likely to be encountered. (1) A higher frequency grounding network is defined as one that is > 300 kHz, and in some cases down to 30 kHz. The higher frequency (equipotential) grounding network provides an equal potential plane with the minimum impedance between the associated electronic components, racks, frames, etc. This plane shall be used at facilities or areas within facilities where interface frequencies are over 300 kHz and may be used at sites where interface frequencies are as low as 30 kHz.

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