Input Sneak Path Current (Multiple Power Supplies)

What does INPUT-SNEAK-PATH mean?

An input signal does not turn off due to a sneak path current created by the use of two power supplies in the system. This unintended current flow bypasses the intended circuit, keeping the input module falsely activated, especially when voltage E1 is greater than E2.

• Use of two power supplies in the input circuit where voltage differences (E1 > E2) create an unintended current path (sneak path).
• Incorrect wiring configuration leading to alternative current routes that keep the input signal active.

Click steps to track your progress.

1. 1

   Consolidate the input circuit to use a single power supply to eliminate the conditions for a sneak path.

2. 2

   If two power supplies are absolutely necessary, connect a diode in series with the input device to block any reverse current flow and prevent the sneak path.