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The RTD Input module has the following data types:
4 analog inputs (4 words)
32 bits of discrete input data for module and channel status (use of this data is optional)
8 bits of discrete output data for fault clearing to the module (also optional)
Analog output data defaults to a length of 0, and should NOT be used for most applications. A starting reference and length in the Bus Interface Unit (BIU) data tables for each data type is selected during module configuration. Depending on the configuration that has been set up for each RTD, the input data can be reported as tenths of ohms, tenths of degrees Fahrenheit, or tenths of degrees Celsius. This module exchanges data with a BIU in the same manner as other types of I/O modules—it provides all its input data and status bits when requested by the BIU, and receives fault-clearing commands from the BIU via its assigned output bits. Note that the BIU can be configured not to send status data over the network. The module can also be configured for “Group” data transfer with the BIU or with other intelligent devices in the same Field Control station. Group data transfer, and the steps for configuring it, are described in the Bus Interface Unit User’s Manual.