Rockwell Automation 1762-IR4 RTD/Resistance Input Module - Manual (Page 39)

Publication 1762-UM003A-EN-P - February 2003
Module Data, Status, and Channel Configuration 3-5
Over-Range Flag Bits (O0 to O3)
Over-range bits for channels 0 through 3 are contained in word 5,
even-numbered bits. They apply to all input types. When set (1), the
over-range flag bit indicates an RTD temperature that is greater than
the maximum allowed temperature or a resistance input that is greater
than the maximum allowed resistance for the module. The module
automatically resets (0) the bit when the data value is again within the
normal operating range.
Under-Range Flag Bits (U0 to U3)
Under-range bits for channels 0 through 3 are contained in word 5,
odd-numbered bits. They apply only to RTD input types. When set
(1), the under-range flag bit indicates an RTD temperature that is less
than the minimum allowed temperature. The module automatically
resets (0) the bit when the data value is again within the normal
operating range.
Configuring Channels After module installation, you must configure operation details, such
as RTD type, temperature units, etc., for each channel. Channel
configuration data for the module is stored in the controller
configuration file, which is both readable and writable.
TIP
There is no under-range error for a direct resistance
input, because 0 is a valid number.