Emerson Rosemount OCX 8800 - Analog Input (AI) Function Block; Introduction

• Other error: Set whenever XD_ERROR is non-zero.
7.8 Analog input (AI) function block
7.8.1 Introduction
The transmitter has four transducer block input/output channels (Table 7-23) for the AI
function blocks. The status of channel values are defined in Table 7-25.
The analog input (AI) function block (Figure) processes field device measurements and
makes them available to other function blocks. The output value from the AI block is in
engineering units and contains a status indicating the quality of the measurment. The
measuring device may have several measurements or derived values available in different
channels. Use the channel number to define the variable that the AI block processes.
AI function blockFigure 7-4:
OUT = The block output value and status
OUT_D = Discrete output that signals a selected alarm condition
The analog input (AI) function block processes field device measurements and makes
them available to other function blocks. The output value from the AI block is in
engineering units and contains a status indicating the quality of the measurement. The
measuring device may have several measurements or derived values available in different
channels. Use the channel number to define the variable AI block processes.
The AI block supports alarming, signal scaling, signal filtering, signal status calculation,
mode control, and simulation. In Automatic mode, the block's output parameter (OUT)
reflects the process variable (PV) value and status. In Manual mode, OUT may be set
Foundation Fieldbus
130 OCX 8800