Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 127)

Publication 1746-UM008B-EN-P - December 2006
Configuration Worksheet for RTD/Resistance Module 127
6. Determine the desired input filter frequency for the channel and
enter the 2-digit binary code in bit field 9 and 10 of the channel
configuration word.
A smaller filter frequency increases the channel update time, but
also increases the noise rejection. A larger filter frequency
decreases the noise rejection, but also decreases the channel
update time.
7. If the channel will be used in your system, it must be enabled by
placing a one in bit 11 if the channel is to be enabled or a zero
in bit 11 if the channel is to be disabled.
8. Select the excitation current for the inputs.
A zero in bit 12 provides an excitation current of 2.0 mA; a 1 will
provide 0.5 mA.
9. If you have selected scaled-for-PID or proportional counts data
formats, you can choose module defined scaling (this applies
the scale associated with your data format selection in step 2).
In addition, use bits 13 and 14 if you want to define the scaling
range yourself for proportional counts data format (user-set
scaling). If you choose to define the scaling range for
proportional counts, make sure to enter the lower and upper
user-set limits in words 4 and 5 (defines range 0) or 6 and 7
(defines range 1).
Refer to Chapter 5.
10. Make sure a zero is in bit 15. This bit is not used.
Bits 9
and 10 Select Filter
Frequency
00 = 10 Hz 01 = 50 Hz 10 = 60 Hz 11 = 250 Hz
Bit 11
Channel
Enable
0 = channel disable 1 = channel enabled
Bit 12 Excitation Current
0 = excitation current = 2.0 mA
1 = excitation current - 0.5 mA
Bits 13
and 14 Select
Scaling
00 = module defined scaling
01 = configuration words 4 and 5 used for scaling (range 0)
10 = configuration words 6 and 7 used for scaling (range 1)
11 = not used (invalid setting)