The ATC880 Pressure/Process Controller is a microprocessor-based instrument with the capability of controlling an extruder.other process using an advanced proprietary SMART self-tuning algorithm. The input is user configurable to be 350Ω Strain Gage, high-level voltage.high level current. The voltage.current inputs are compatible with many process transmitter combinations. Three fully programmable alarms.an analog retransmission output are also included as part of the standard ATC880 package. Five groups of configuration parameters are available from the keyboard,.are protected by three levels of user definable software locks. (A sixth group of read-only parameters can also be viewed) In the programming mode the lower display will show the parameter being displayed,.the upper display will show its value. In the operating mode, the upper display will show the process variable,.the lower display offers the choice of displaying set point, deviation from set point, output %, RPM.peak. In addition, a red LED bar graph presents an analog representation of the main input (process variable), as well as indication of the alarm set points. The alarms are shown relative to the span of process.are indicated as missing.present bars relative to the process input. References to Profibus features.instructions should be ignored. Profibus is being considered for a future line expansion.has been accommodated in the current design.