Alerton APLC-2 APLC2 PLC Programmable Logic Controller for HVAC [Refurbished]

Alerton APLC-2 PLC Programmable Logic Controller for HVAC - The Alerton ?« APLC2 is a high performance, programmable logic controller designed for control of HVAC and industrial equipment. Applications include central plant, air handling units, clean rooms and fume hoods. It operates either as a standalone controller or as part of a site-wide DDC system. The APLC2 control logic is programmed using Alerton's easy-to-learn block programming language. This self documenting software includes a complete library of control functions and provides totally flexible strategies to be implemented. A single APLC2 may contain multiple control loops for the development of complex control strategies. The APLC2 is designed for high-speed data processing, with an internal DDC loop cycle time of 100 msec. Programmable timers have a resolution of 100 msec. Analog inputs are high resolution 10 bit inputs. Each is field adjustable for 3K or 10K thermistors, dry contact, 0-5 VDC, 0-10 VDC or 0-20mA. The APLC2 supports the Alerton Microset?äó, an intelligent wall mounted zone temperature sensorwith a digital display and simple push-button controls. All input and output values can be viewed at the Microset. Reliable and stable operation is provided with CMOS circuitry, four layer circuit board with separate ground plane, hardware and software input filtering and power supply noise filters. The communication trunk is optically isolated to prevent ground loop problems. The CMOS processor incorporates an internal watchdog monitor. The power supply voltage is monitored to provide automatic shutdown and data backup. All program data is stored in non-volatile EEPROM memory. The APLC2 communicates with the Alerton global controller over a 2-wire communication trunk at 9600, 4800, or 1200 baud. It can also be directly connected to the PC that is running the development software.. Alerton. Honeywell. APLC-2.