Recommended Margin
Size the supply with reserve for simultaneous load, inrush, aging, ambient temperature, cabinet heat, and future I/O expansion.
VoltCheck24 Engineering Calculator
SMPS Capacity Calculator
Estimate 24V DC power supply capacity for PLC I/O, sensors, relays, solenoid valves, HMI devices, and field modules.
Common Mistake
Nominal current totals can miss solenoid surge, capacitive input current, redundant diode drop, and voltage adjustment requirements.
Next Step
After capacity selection, verify end-of-line voltage drop so remote devices still receive adequate terminal voltage.