Rockwell-automation 1746-NR4 SLC RTD/Resistance Input Module User Manu Uživatelský manuál stáhnout pdf (Strana 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 0.1Ω /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 1Ω /step for all resistance input types except 150 Ω. For the 150 Ω resistance input type, the values are in 0.1Ω /step.

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 147 148

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