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The Challenge of DC Signal Diversity Direct-current measurement and control are essential to every power and industrial automation system, yet DC signals rarely come in a single form. In substations,   110/220 VDC control power   must be monitored accurately to ensure dependable tripping and closing operations. In industrial environments,   PLCs and DCSs   typically accept only standardized analog inputs such as   4–20 mA   or   0–5 V , while field devices often output unscal