PLC selection note — 28-point main unit
The Delta DVP28SV11S2 is a 28-point programmable logic controller from the DVP Series, built as an S-TYPE main processing unit with DC-input (H TYPE) architecture. It runs on a 24VDC supply with a tolerance of -15% to +20% and includes reverse-polarity protection on the DC input — a practical safeguard for field wiring where polarity mix-ups happen. Power consumption sits at 6W, so the backplane budget is modest; plan for the full 24VDC rail to handle the inrush of 2.2A at power-up.
Environment and protection
Rated for operation from 0°C to 55°C with 5% to 95% humidity and pollution degree 2, so it's comfortable inside a ventilated IP54 enclosure on a factory floor — not sealed for washdown, but fine for dry indoor panels. The polyswitch fuse rated at 2.5A / 30VDC on the output side resets after a fault, which saves a fuse swap on a line-down event.