PLCs programmable to the IEC61131 standard with libraries specifically for HVAC applications. They are available in both DIN-rail-mounted versions (OTD with display, OTB blind), and soon to be available in 32x74 panel-mount format (OTF). I/O expansions (EVE) and displays (OTDLED) can be combined with FREE Optima series models to complete the offering. Inputs and outputs are independent and configurable, ensuring adaptability to any system.