Channel configuration word - bit definitions – Rockwell Automation 1746-NT4 SLC 500 Thermocouple/mV Input Module Installation Instructions User Manual
Page 18
18 SLC™ 500 4-Channel Thermocouple/mV Input Module
Publication 1746-IN010D-EN-P - June 2004
Channel Configuration Word - Bit Definitions
Define
To Select
Make these bit settings in the Channel Configuration Word
(1)
(1)
Bit settings other than those shown in the table are invalid.
15–12
(2)
(2)
Ensure unused bits 12-15 are always set to zeros.
11 10 9
8
7
6
5
4
3
2
1
0
Input type
Thermocouple Type J
No
t U
se
d
0
0
0
0
Thermocouple Type K
0
0
0
1
Thermocouple Type T
0
0
1
0
Thermocouple Type E
0
0
1
1
Thermocouple Type R
0
1
0
0
Thermocouple Type S
0
1
0
1
Thermocouple Type B
0
1
1
0
Thermocouple Type N
0
1
1
1
±50mV
1
0
0
0
±100mV
1
0
0
1
CJC temperature
1
1
1
1
Data format
Engineering units 1
(3)
(3)
For engineering units x 1, values are expressed in 0.1 degrees or 0.01 mV.
0
0
Engineering units 10
(4)
(4)
For engineering units x 10, values are expressed in 1.0 degrees or 0.1 mV.
0
1
Scaled-for-PID
1
0
Proportional Counts
1
1
Open circuit Zero
0
0
Upscale
0
1
Downscale
1
0
Temperature
units
Degrees C
(5)
(5)
When millivolt input type is selected, the bit setting for temperature units is ignored.
0
Degrees F
1
Channel
filter
frequency
10 Hz
0
0
50 Hz
0
1
60 Hz
1
0
250 Hz
1
1
Channel
enable
Channel Disabled
0
Channel Enabled
1