SLVAF72 September 2021 TPS2661
Programmable logic controller (PLC) applications require a full function, flexible, programmable analog output solution. Figure 3-1 shows an analog output module. It hosts a DAC which converts the digital data and control instructions from the PLC MCU to analog data for the downstream actuators or indicators. Most of the AOM’s will be HART compatible to communicate with the on-field sensors used for system diagnostics. A HART enabled analog output module consists of a HART modem which will demodulate the ac coupled HART signals.
TPS2661x can be used for protection of analog output module against any high voltage field miswiring. The out-pin voltage is monitored with respect to the +Vs/-Vs supply voltages. If the OUT voltage goes outside the +Vs/-Vs supply rails, the FETs cutoff current conduction path and protects the whole system.