Manual

RTD Input Equipment (T7432)
PD - 7037 Mar - 06 3
Figure 1 . Block Diagram of the RTD Input Equipment.
The Serial data received from the Mux is optically coupled at
the input module to provide electrical isolation. The input
module's 68000 - based microcomputer processes the RTD data.
This microcomputer’s functions include:
· Noise filtering
· Automatic calibration
· Temperature conversion and linearization
· RTD lead - wire compensation
· Diagnostics
The processor modules send triplicated read data requests to
the RTD input module over the I/O Safetybus. The processors’
addressing data and data read requests are voted by the
module (preventing I/O Safetybus failures upstream from the
module from affecting module operations). The voted result is
then passed to the I/O bus interface logic.