14 DeviceNet Base RTD and Thermocouple CompactBlock LDX I/O
Publication 1790-IN011C-EN-P - January 2015
I/O Memory Mapping
1790D-4R0, 1790D-T4R0 Input Data File
Word Bit Position
15
14
13
12
11
10
9
8
7
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
Word/Bit Descriptions – 1790D-4R0, 1790D-T4R0 RTD
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.
Bits 12…15
Not used: Set to 0
1790D-4T0, 1790D-T4T0 Input Data File
Word Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
Thermocouple Input Data Channel 0
1
Thermocouple Input Data Channel 1
2
Thermocouple Input Data Channel 2
3
Thermocouple Input Data Channel 3
4
Not used
S11 S10 S9
S8
Not used
S3
S2
S1
S0
