Rockwell Automation 1794-IRT8XT/B TC/MV/RTD Input Module Installation Instructions - Manuel (Page 4)

4
Publication 1794-IN050J-EN-P - January 2009
Output Map (Write)
Data Format for All Channels - Write Word 0
Fault Mode - Write Word 0
Reference Junction Selection - Write Word 0
Add-on Filter Selections - Write Word 0
Sensor Mode Select - Write Word 1
TC/RTD Input Type Selection - Write Word 1
Sensor Type Select - Write Word 1
RTD Offset Select - Write Word 2
Specifications
Word 9 Ch 7
Flt Ch 6
Flt Ch 5
Flt Ch 4
Flt Ch 3
Flt Ch 2
Flt Ch 1
Flt Ch 0
Flt CJC2
Alm CJC1
Alm SAB CJC
Status Reserved
Word 10 Command Response Response Data
Where: SAB = Series of unit; 0 = Series A, 1 = Series B
Alm = Alarm
Flt = Fault
Dec. 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Oct. 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Word 0 Reserved Data Format Flt
Mod
e Ch
4-7 Flt
Mod
e Ch
0-3 Reference Jct. Filter Cutoff
Word 1 TC/RTD Ch
4-7 Sensor
Mode
Ch 4-7
Sensor Type
Ch 4-7
TC/RTD
Ch 0-3
Sensor
Mode
Ch 0-3
Sensor Type
Ch 0-3
Word 2 RTD Offset
Ch 7
RTD Offset
Ch 6
RTD Offset
Ch 5
RTD Offset
Ch 4
RTD
Offset
Ch 3
RTD Offset
Ch 2
RTD Offset
Ch 1
RTD Offset
Ch 0
Word 3 Command Command Data
Bit 11 10 09 08
0 0 0 0 °C (implied decimal point XXXX.X)
0 0 0 1 °F (implied decimal point XXXX.X)
0 0 1 0 °K (implied decimal point XXXX.X)
0 0 1 1 -32767…+32767
0 1 0 0 0…65535
0101 thru 1111 not used
Module defaults to -4000…10000 in millivolt mode, and 0…5000 in ohms mode with implied decimal points (for
example, -40 mV, 0.01
Ω) whenever °C, °F or °K is selected.
Bit 06 Fault enable for channels 0…3
07 Fault enable for channels 4…7
0 = Disabled
1 = Enabled
Bits
3-5 Reference Junction - used when sensor select is set to thermocouple and
sensor mode is set to internal compensation. Sets a fixed reference junction
to compensate all thermocouple channels.
Bit 05 04 03 Reference Junction
0 0 0 0 °C (32 °F)
0 0 1 20 °C (68 °F)
0 1 0 25 °C (77 °F)
0 1 1 30 °C (86 °F)
1 0 0 40 °C (104 °F)
1 0 1 50 °C (122 °F)
1 1 0 60 °C (140 °F)
1 1 1 70 °C )158 °F)
Bit 02 01 00 Filter Time Constants - Actual filtering depends on the
module’s mode of operation.
0 0 0 Hardware filtering only (default filtering)
0 0 1 25 ms
0 1 0 100 ms
0 1 1 250 ms
1 0 0 500 ms
1 0 1 1 s
1 1 0 2 s
1 1 1 5 s
Bit 05 04 Sensor mode for channels 0…3
Bit 13 12 Sensor mode for channels 4…7
Thermocouple
0 0 External compensation - uses cold junction sensors (Both CJC sensors must be used
when external compensation is selected.)
0 1 Internal compensation - uses the value selected for “reference junction selection”
1 0 No compensation (Data is referenced to 0 °C.)
1 1 Differential measurement between 2 channels (0-1, 2-3, 4-5, 6-7)
RTD
0 0 2-wire RTD no compensation
0 1 2-wire RTD with user selected compensation
1 0 3-wire RTD
1 1 4-wire RTD
Dec. 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Oct. 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Bit 07 06 Input type for channels 0…3
Bit 15 14 Input type for channels 4…7
0 0 Thermocouple
0 1 RTD
1 0 Not used
1 1 Not used
RTD Type
Bit 03 02 01 00 Sensor type for channels 0…3
Bit 11 10 09 08 Sensor type for channels 4…7
0 0 0 0 Resistance (default)
0 0 0 1 100 Ω Pt α = 0.00385 Euro -200…+870 °C(-328…+1598 °F)
0 0 1 0 200 Ω Pt α = 0.00385 Euro -200…+400 °C(-328…+752 °F)
0 0 1 1 100 Ω Pt α = 0.003916 U.S. -200…+630 °C(-328…+1166 °F)
0 1 0 0 200 Ω Pt α = 0.003916 U.S. -200…+400 °C(-328…+752 °F)
0 1 0 1 100 Ω Nickel -60…+250 °C(-76…+482 °F)
0 1 1 0 200 Ω Nickel -60…+200 °C(-76…+362) °F)
0 1 1 1 120 Ω Nickel -80…+320 °C(-112…+608 °F)
1 0 0 0 10 Ω Copper -200…+260 °C(-328…+470 °F)
1001 thru 1111 not used
Thermocouple Type
Bit 03 02 01 00 Sensor type for channels 0…3
Bit 11 10 09 08 Sensor type for channels 4…7
0 0 0 0 mV (default)
0 0 0 1 B 300…1800 °C (572…3272 °F)
0 0 1 0 E -270…1000 °C (-454…1832 °F)
0 0 1 1 J -210…1200 °C (-346…2192 °F)
0 1 0 0 K -270…1372 °C (-454…2502 °F)
0 1 0 1 TXK/XK(L)-200…800 °C (-328…1472 °F)
0 1 1 0 N -270…1300 °C (-450…2372 °F)
0 1 1 1 R -50…1768 °C (-58…3214 °F)
1 0 0 0 S -50…1768 °C (-58…3214 °F)
1 0 0 1 T -270…400 °C (-454…752 °F)
1010 thru 1111 not used
Bit 01 00 RTD Offset Select Bits - Channel 0
Bit 03 02 RTD Offset Select Bits - Channel 1
Bit 05 04 RTD Offset Select Bits - Channel 2
Bit 07 06 RTD Offset Select Bits - Channel 3
Bit 09 08 RTD Offset Select Bits - Channel 4
Bit 11 10 RTD Offset Select Bits - Channel 5
Bit 13 12 RTD Offset Select Bits - Channel 6
Bit 15 14 RTD Offset Select Bits - Channel 7
0 0 Use channel loop compensation value stored during calibration procedure for 2-wire RTD
(default = 0
Ω) - 15 Ω max (Note: Functional up to RTD = 484 Ω max with total lead
resistance = 15 Ω.
0 1 5 Ω (total lead resistance)
1 0 10 Ω (total lead resistance)
1 1 15 Ω (total lead resistance)
Specifications - 24V dc Analog Module, Cat. No. 1794-IRT8, -IRT8K, IRT8XT
Number of inputs 8 channels (2 groups of 4)
Module Location Cat. No. 1794-TB3G, 1794-TB3GS, 1794-TB3GK Terminal Base Units
Nominal input voltage
ranges -40…100 mV dc for thermocouples
0…325 mV for RTDs
mV (default)
Supported
thermocouple types Type Range °C Range °F
B 300…1800 °C (572…3272 °F)
E -270…1000 °C (-454…1832 °F)
J -210…1200 °C (-346…2192 °F)
K -270…1372 °C (-454…2502 °F)
TXK/XK(L)-200…800 °C (-328…1472 °F)
N -270…1300 °C (-454…2372 °F)
R -50…1768 °C (-58…3214 °F)
S -50…1768 °C (-58…3214 °F)
T -270…400 °C (-454…752 °F)
Supported RTD types Resistance
100 Ω Pt α = 0.00385 Euro -200…870 °C(-328…1598 °F)
200 Ω Pt α = 0.00385 Euro -200…400 °C(-328…752 °F)
100 Ω Pt α = 0.003916 U.S. -200…630 °C(-328…1166 °F)
100 Ω Pt α = 0.003916 U.S. -200…400 °C(-328…752 °F)
100 Ω Nickel -60…250 °C(-76…482 °F)
200 Ω Nickel -60…200 °C(-76…362) °F)
120 Ω Nickel -80…320 °C(-112…608 °F)
10 Ω Copper -200…260 °C(-328…470 °F)
Resolution 14 bits