Rockwell Automation 1794-IT8_IR8 FLEX I/O 8 Thermocouple Input Module - Manual (Page 4)

4
Publication 1794-IN021D-EN-P - August 2003
Block Transfer Read and Write
The following block transfer read and write word bit information is presented
for experienced users only. Refer to the user manuals (publication
1794-UM004 for the RTD or 1794-UM007 for TC/mV) for these products for
complete information on programming and configuring your modules.
Input Map (Read) for 1794-IR8 and 1794-IT8
Temperature and resistance data is returned with an implied decimal point. For
example, a temperature data of 1779 is 177.9°. Resistance data of 2034 is
203.4 Ω. mV data is returned with an implied decimal point of 2 decimal points.
for example, 7500 is 75mV.
Output Map (Write) for 1794-IR8 and 1794-IT8
Data Format for All Channels - Write Word 0
RTD Type - Write Word 1 and 2
Thermocouple Type - Write Word 1 and 2
Dec. 15 14 13 12 11 10 9 0 7 6 5 4 3 2 1 0
Oct. 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
Word
0
Reserved
1 Channel 0 Input Data
2 Channel 1 Input Data
3 Channel 2 Input Data
4 Channel 3 Input Data
5 Channel 4 Input Data
6 Channel 5 Input Data
7 Channel 6 Input Data
8 Channel 7 Input Data
9 Overrange Alarm Bits (channel 0 = bit 8, etc.) Underrange Alarm Bits (channel 0 = bit 0, etc.
10
(-IT8)
0 0 0 0 0 Bad
Cal Cal
Done Cal
Rng 0 Diag.
Status Bits Pwr
Up Bad
Struct CJC
Over CJC
Under
10
(-IR8)
0 0 0 0 0 Bad
Cal Cal
Done Cal
Rng RI
UP Critical
Error Bits Pwr
Up Res. 0 0
Dec. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Oct. 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
IT8
Word 0 8-Bit Calibration Mask Cal
Clk Cal
Hi/
Lo Filter Cutoff FDF MDT
IR8
Word 0 8-Bit Calibration Mask Cal
Clk Cal
Hi/
Lo Filter Cutoff Enh MDT
Word 1 Thermocouple or RTD
Type Ch 3
Thermocouple or RTD
Type Ch 2
Thermocouple or RTD
Type Ch 1
Thermocouple or RTD
Type Ch 0
Word 2 Thermocouple or RTD
Type Ch 7
Thermocouple or RTD
Type Ch 6
Thermocouple or RTD
Type Ch 5
Thermocouple or RTD
Type Ch 4
Word 3 Reserved
Where: FDF = Fixed digital filter (TC only)
Enh = Enhanced mode (RTD only)
MDT = Module Data Type
Bit 01 00
0 0 °C
0 1 °F
1 0 Bipolar counts scaled between -32767 to +32767
1 1 Unipolar counts scaled between 0 and 65535
0101 thru 1111 not used
RTD Type
Bit 03 02 01 00 Channel 0 (Write word 1)
Bit 07 06 05 04 Channel 1 (Write word 1)
Bit 11 10 09 08 Channel 2 (Write word 1)
Bit 15 14 13 12 Channel 3 (Write word 1)
Bit 03 02 01 00 Channel 4 (Write word 2)
Bit 07 06 05 04 Channel 5 (Write word 2)
Bit 11 10 09 08 Channel 6 (Write word 2)
Bit 15 14 13 12 Channel 7 (Write word 2)
0 0 0 0 Resistance (default = mV)
0 0 0 1 No sensor connected - do not scan
0 0 1 0 100 Ω Pt α = 0.00385 Euro (-200 to +870°C)
0 0 1 1 100 Ω Pt α = 0.003916 U.S. (-200 to +630°C)
0 1 0 0 200 Ω Pt α = 0.00385 Euro (-200 to +630°C)
0 1 0 1 500 Ω Pt α = 0.00385 Euro (-200 to +630°C)
0 1 1 0 Reserved
0 1 1 1 10 Ω Copper (-200 to +260°C)
1 0 0 0 120 Ω Nickel (-60 to +250°C)
1 0 0 1 100 Ω Nickel (-60 to +250°C)
1 0 1 0 200 Ω Nickel (-60 to +250°C)
1 0 1 1 500 Ω Nickel (-60 to +250°C)
1 1 0 0 Reserved
Thermocouple Type Range
Bit 03 02 01 00 Channel 0 (Write word 1)
Bit 07 06 05 04 Channel 1 (Write word 1)
Bit 11 10 09 08 Channel 2 (Write word 1)
Bit 15 14 13 12 Channel 3 (Write word 1)
Bit 03 02 01 00 Channel 4 (Write word 2)
Bit 07 06 05 04 Channel 5 (Write word 2)
Bit 11 10 09 08 Channel 6 (Write word 2)
Bit 15 14 13 12 Channel 7 (Write word 2)
0 0 0 0 mV (default)
0 0 0 1 B 300 to 1800°C (572 to 3272°F)
0 0 1 0 E -270 to 1000°C (-454 to 1832°F)
0 0 1 1 J -210 to 1200°C (-346 to 2192°F)
0 1 0 0 K -270 to 1372°C (-454 to 2502°F)
0 1 0 1 R -50 to 1768°C (-58 to 3214°F)
0 1 1 0 S -50 to 1768°C (-58 to 3214°F)
0 1 1 1 T -270 to 400°C (-454 to 752°F)
1 0 0 0 C 0 to 2315°C (32 to 4199°F)
1 0 0 1 N -270 to 1300°C (-450 to 2372°F)
1 0 1 0 TXK/XK(L) -200 to 800°C (-328 to 1472°F)
1 0 1 1 Reserved
1 1 0 0 Module reports cold junction sensor temperature for channels 00-03
1 1 0 1 Module reports cold junction sensor temperature for channels 04-07
1 1 1 0 Reserved
1 1 1 1 No input device connected - do not scan