Channel configuration worksheet, Project, Project ________________________ slot number – Rockwell Automation 1746-INT4 Thermocouple/mV Isolated Input Module Quick Start User Manual
Page 19: Slot number _____ channel number, Channel number
Thermocouple/mV Isolated Input Module 19
Publication 1746-QS002B-EN-P - July 2002
Channel Configuration Worksheet
SLC is a registered trademark of Rockwell Automation, Inc.
Allen-Bradley and SLC 500 are trademarks of Rockwell Automation, Inc.
Channel Configuration Word (O:e.0 through O:e.3) - Bit Descriptions
Set these bits in the Channel Configuration Word
Bit(s)
Define
To Select
15-12
11
10
9
8
7
6
5
4
3
2
1
0
Description
TC Type J
0
0
0
0
TC Type K
0
0
0
1
TC Type T
0
0
1
0
TC Type E
0
0
1
1
Project ________________________
TC Type R
0
1
0
0
Project ________________________
Slot Number _____
TC Type S
0
1
0
1
Slot Number _____
Channel Number _____
TC Type B
0
1
1
0
Channel Number _____
Input
TC Type N
0
1
1
1
0-3
Input
Type
50mV
1
0
0
0
100mV
1
0
0
1
Configure the channel for the input type connected to it.
TC Type C
1
0
1
0
Valid inputs are thermocouples and analog input signals
of
+
50mV and
+
100mV. You can configure the channel to
TC Type D
1
0
1
1
of
+
50mV and
+
100mV. You can configure the channel to
read the cold-junction (CJC) temperature. When reading
Invalid
1
1
0
0
the CJC temperature, the channel ignores the physical
input signal.
Invalid
1
1
0
1
input signal.
Invalid
1
1
1
0
CJC Temp.
1
1
1
1
Engr. Units x1
0
0
Select the channel data format from:
Engineering units (EU) x1 or x10
Data
Engr. Units x10
0
1
Engineering units (EU) x1 or x10
For EU x1, values are in 0.1 degrees or 0.01mV.
For EU x10, values are in whole
o
C or
o
F or 0.1mV.
4, 5
Data
Format
Scaled-for-PID
1
0
For EU x10, values are in whole C or F or 0.1mV.
Scaled-for-PID (value is the same for any input type)
Proportional input signal range is scaled to 0-16,383 counts.
Counts
1
1
Proportional input signal range is scaled to 0-16,383 counts.
Proportional counts (value is same for any input type)
Proportional input signal range is scaled to
+
32,767 counts.
Zero
0
0
Select module response to a detected open circuit from:
Zero to force the channel data word to zero.
Open
Upscale
0
1
Zero to force the channel data word to zero.
Upscale to force the channel data word to full scale.
Downscale to force channel data word to low scale.
6, 7
Circuit
Mode
Downscale
1
0
Downscale to force channel data word to low scale.
Important: A bit selection or 1 1 is invalid.
For an open CJC thermistor, mV channels are not affected.
Invalid
1
1
For an open CJC thermistor, mV channels are not affected.
Important: The module requires 500 msec or one module
update to flag the error while it ramps the channel input.
Units
Degrees C
0
Select
5
C/
5
F for thermal inputs. Ignored for mV inputs.
5
5
8
o
F,
o
C
Degrees F
1
Important: For EU x1 and
5
F (0.1
5
F), an over-range error
will occur above 3276.7
5
F (cannot exceed 32767 counts).
9, 10
Unused
Unused
0
0
These bits must be zero for a valid configuration.
Chnl
Channel Off
0
11
Chnl
Enable
Channel On
1
12-15
Unused
Unused
0000
These bits must be zero for a valid configuration.
Enter Your Bit Selections >>
0000
For the Channel Configuration Word
Disable unused channels for faster response.
When set, module configures the channel and reads channel input before setting this bit in status word.
If you change the configuration word, the status word must reflect the change before new data is valid.
If you clear configuration word, module clears channel and status words. For new configuration word,
channel data and status words remain cleared until the module sets this bit (11) in the status word.