Adhere to the following guidelines for grounding the 800 series I/O modules:
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To have proper case ground, the housing must be connected to earth ground.
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When using shielded field circuit wires, do not ground the shield at both ends of the circuit (i.e., the module and the field device).
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Single point grounding should be used where possible.
Priority for shield grounding is as follows:
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Field side device case, if metal.
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Earth ground, as close to the field side device or module as possible.
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From shield to frame.
