Rockwell Automation 1790P-4R0 CompactBlock LDX I/O RTD/Resistance Input Module - Manual (Page 32)

Publication 1790-UM002A-EN-P
3-2 Module Data, Status, and Channel Configuration for DeviceNet
Input Data File The input data table lets you access RTD input module read data for use
in the control program, via word and bit access. The data table structure is
shown in the tables below.
Input Data Values
Data words 0 through 3 correspond to channels 0 through 3 and contain
the converted analog input data from the input device.
Under-Range Flag Bits (S0 to S3)
Over-range bits for channels 0 through 3 are contained in word 4, bits 0-3.
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.
Table 3.1 Input Data Table
Word/
Bit
15 14 13 12 11 10 9 8 6 5 4 3 2 1 0
0 RTD Input Data Channel 0
1 RTD Input Data Channel 1
2 RTD Input Data Channel 2
3 RTD Input Data Channel 3
4 Not Used S11 S10 S9 S8 Not Used S3 S2 S1 S0
Table 3.2 Input Data Table
Word Decimal Bit Description
Read Word 0 Bits 00-15 Channel 0 input data
Read Word 1 Bits 00-15 Channel 1 input data
Read Word 2 Bits 00-15 Channel 2 input data
Read Word 3 Bits 00-15 Channel 3 input data
Read Word 4
Bits 00-03
Underrange for individual channels - Bit 00 corresponds to input
channel 0, bit 01 corresponds to input channel 1 and so on.
When set (1), the input signal is below the input channel’s
minimum range.
Bits 04-07 Not used: Set to 0
Bits 08-11 Overrange for individual channels - Bit 08 corresponds to input
channel 0, bit 09 corresponds to input channel 1 and so on.
When set (1), the input signal is above the input channel’s
maximum range, or open RTD is detected.
Bit 12-15 Not used: Set to 0.
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