AAI143-H00 S1

The AAI143 base design receives sixteen 4–20 mA signals with isolation between the input and system. Its reference accuracy is ±16 µA and its analog data update period is 10 ms. The allowable input current is 24 mA. These analog acquisition figures describe the base design; the complete AAI143-H00 S1 marking and fitted revision remain part of the replacement check.

For each channel, a setting pin selects a two-wire or four-wire transmitter arrangement. In two-wire service the module provides transmitter power, with at least 19.0 V at 20 mA and no more than 25.5 V at zero current, subject to the base-design 25 mA output-current limit. External wiring voltage drop must be included in the loop calculation. A Zener barrier cannot be connected to this module; an isolation barrier is required for the applicable intrinsically safe arrangement.

The AAI143-H design communicates with HART field devices and places analog data and HART variables in the I/O image. The FCS accesses that image for regulatory or sequence functions. The referenced HART implementation supports up to 16 devices and 32 HART variables per module; multidrop use is limited to input devices and does not support the analog value or burst function. Analog scan timing and HART-variable refresh are different, so control design must use the relevant update behavior.