The FFMAI_RMT function block can process up to eight fieldbus device measurements from a single device. This function block is for fieldbus applications where the sensor types are the same. The FFMAI_RMT block can optimize the communications on an H1 segment by providing all of the information for up to 8 measurements in a single function block.
Note that the FFMAI_RMT block uses many of the same parameters to support all eight inputs. One consequence of this is that the RTD's or thermocouples connected to an FFMAI_RMT block must all have the same range. In a similar way, the simulation value and mode handling applies to all outputs as well. The FFMAI_RMT block is ideal for higher density fieldbus transmitters, such as the Rosemount Model 848T transmitter.
The following diagram shows the internal components of the Multiplexed Analog Input function block:
