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The T9481 and 9482 analogue output modules deliver 4 mA to 20 mA output current for field devices. Each channel is a current sink device and in simplex mode a channel drops the full demanded current. In dual module operation each channel drops half the output current. The module features voltage and load current channel monitoring, reverse current protection and short and open circuit line monitoring.

It is designed to always be able to switch off an output when demanded. Internal diagnostics do continuous functionality checks. All module, channel and status information is displayed on front panel indicators and status data is routed to the AADvance where it can be viewed and checked. The module has a user configurable failure mode that can be set outputs to hold last state, fail safe, or a user specified output state. In dual mode the two modules communicate with each other by an inter-module link to maintain fault tolerant operation'.

This module supports HART commands #03 to collect data from the field device. The application can be configured to use HART information to monitor and respond to device conditions. It may also be used to supply diagnostic information such as comparison and error reporting.