Rockwell-automation 1794-IRT8XT/B TC/MV/RTD Input Module Installation Manual de usuario descargar pdf (Pagina 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 11100908

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

0000 °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.

000Hardware filtering only (default filtering)

00125 ms

0 1 0 100 ms

0 1 1 250 ms

1 0 0 500 ms

1011 s

1102 s

1115 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

103-wire RTD

114-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

01RTD

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

0000Resistance (default)

0001100 Ω Pt α = 0.00385 Euro -200…+870 °C(-328…+1598 °F)

0010200 Ω Pt α = 0.00385 Euro -200…+400 °C(-328…+752 °F)

0011100 Ω Pt α = 0.003916 U.S. -200…+630 °C(-328…+1166 °F)

0100200 Ω Pt α = 0.003916 U.S. -200…+400 °C(-328…+752 °F)

0101100 Ω Nickel -60…+250 °C(-76…+482 °F)

0110200 Ω Nickel -60…+200 °C(-76…+362) °F)

0111120 Ω Nickel -80…+320 °C(-112…+608 °F)

100010 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

0000mV (default)

0001B300…1800 °C (572…3272 °F)

0010E-270…1000 °C (-454…1832 °F)

0011J-210…1200 °C (-346…2192 °F)

0100K-270…1372 °C (-454…2502 °F)

0101TXK/XK(L)-200…800 °C (-328…1472 °F)

0110N-270…1300 °C (-450…2372 °F)

0111R-50…1768 °C (-58…3214 °F)

1000S-50…1768 °C (-58…3214 °F)

1001T-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.

015 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

1 2 3 4 5 6

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Rockwell-automation 1794-IRT8XT/B TC/MV/RTD Input Module Installation Manual de usuario Pagina 4

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