Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 109)

Publication 1746-UM008B-EN-P - December 2006
Application Examples 109
Program Listing
Because a seven-segment LED indicator display is used to display
temperature, the temperature data must be converted to BCD. The
16-bit data word representing the temperature value is converted into
BCD values by the program shown in the Program to Convert °F to
BCD.
Bits
0…3
Input Type Selected
0000 = 100 Ω Pt. (385)
0001 = 200 Ω Pt. (385)
0010 = 500
Ω Pt. (385)
0011 = 1000
Ω Pt. (385)
0100 = 100
Ω Pt. (3916)
0101 = 200
Ω Pt. (3916)
0110 = 500
Ω Pt. (3916)
0111 = 1000 Ω Pt. (3916)
1000 = 10
Ω Cu (426) (1)
1001 = 120
Ω Ni (618) (2)
1010 = 120
Ω Ni (672)
1011 = 604 Ω Ni-Fe (518)
1100 = 150 Ω Potentiometer
1001 = 500
Ω Potentiometer
1110 = 1000
Ω Potentiometer
1111 = 3000
Ω Potentiometer
Bits 4
and 5
Data Format Select
00 = engineering units, x 1
(3)
01 = engineering units, x10
(4)
10 = scaled-for-PID (0…16,383)
11 = proportional counts (-32,768 …32,767)
Bits 6
and 7
Broken Input Select 00 = zero 01 = upscale 10 = downscale 11 = invalid
Bits 8
Temperature Units
Select
0 = degrees Celsius 1 = ° F
Bits 9
and 10 Filter Frequency
Select
00 = 10 Hz 01= 50 Hz 10 = 60 Hz 11 = invalid
Bit 11 Channel Enable 0 = channel disabled 1 = channel enabled
Bit 12
Excitation Current
Select
0 = 2.0 mA 1 = 0.5 mA
Bit 13
and 14
Scaling Select
00 = module defined scaling
(default) 01 = config. words 4 and 5
for scaling 10 = config words
6 and 7 for scaling 11 = Not used (config
error)
Bits 15 Not Used 0 = always make this setting
(1) Actual value at 0 °C (32 °F) is 9.042 Ω per SAMA standard RC21-4-1966.
(2) Actual value at 0 °C (32 °F) is 100 Ω per DIN standard.
(3) Values are 0.1 °/step or 0.1 Ω /step for all resistance input types except 150 Ω. For the 150 Ω resistance input type, the values are in 0.01Ω /step.
(4) Values are 1 °/step or 1 Ω /step for all resistance input types except 150 Ω. For the 150 Ω resistance input type, the values are in 0.1Ω /step.