Rockwell Automation T743x-xx ICS Regent+Plus RTD Input Equipment - Manual (Page 3)

RTD Input Equipment (T7432)
P D - 7 0 3 7 M a r - 0 6
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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.