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The ASI module measures the cold junction RTDs on the termination unit of the analog input module. This results in an accurate reading of the ambient temperature at the field wire termination area. This value can be used by the ASI module to compensate for voltages generated from the bimetalconnections made by terminating the field wires (thermocouple wires) onto the terminal blocks of the termination unit. The block address of the cold junction reference used by thermocouple inputs on the ASI module is contained in FC 215, specification S3. Each analog input module configured for a thermocouple input requires a cold junction reference. Each analog input module can only have one reference which can be used by up to 16 thermocouple inputs. The exception to this is when The onboard microcontroller coordinates ASI functions. The main functions are: Channel and cold junction reference switching.Programming A/D converters. Reading the A/D converters and applying all necessary correction factors. Interfacing to switch and LEDs (used for diagnostic mode). Background integrity checking.  Reading and writing expander bus data through dual port RAM (DPRAM).

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