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> Bailey infi 90 NAMM03
Bailey infi 90 NAMM03
An NAMM03 enables the INFI 90 system to accept up to 64 high level, millivolt, thermocouple and Resistive Temperature Device (RTD) analog signals from a process. If configured, up to 12 input values can be sent over a station serial link to Indicator Stations (NDIS01) for display. The AMM drives a serial link that supports up to four indicator stations, each displaying up to three values. Process field devices connected directly to Termination Units (TU) or Termination Modules (TM) provide the input signals. An ASM must be used to interface and condition process signals sent to an AMM from a TU/TM. The AMM controls the input selection. Calibrations must be performed to establish values the AMM uses to correct for minor variations in hardware, time and temperature. AMM circuits use a calibration configuration to determine correction values, and store the values in memory. It combines these values with lead wire resistances to adjust for errors caused by thermocouple and RTD field wiring. The AMM provides an internally generated calibration signal. A TU/TM uses this signal to develop references that can be used to calibrate a thermocouple slave module. An external source can be used in place of the internal reference. A redundant (backup) AMM can be configured and installed to provide control if a primary AMM fails. This secondary AMM communicates with a primary over a serial link. From data continuously received over the link, the secondary contains the same configuration, data and operating mode as the primary. This allows it to provide uninterrupted control using current process data during a primary module failure. An INFI 90 device communicates with an AMM over a serial module bus. Each module on the module bus has a unique address set by its address dipswitch. Messages are directed to the AMM using this address.
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