B875–102 High Speed Analog Input, Switch Settings
(Original Document)
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Dip Switch Bank A
The high speed analog input module can be set for any of the five input voltage or current ranges by means of DIP switches. You can also select from seven periods of digital filtering; a feature which allows an instantaneous voltage sample to become part of a moving average. The DIP switches also set the module for 4 or 8 circuit mode and binary or decimal output.
For discussion purposes, we will designate the upper DIP switch bank, A (DIP sw-A) and lower bank, B (DIP sw-B). These switches are accessed through ports at the rear of the module.
The following illustration shows DIP sw-A as seen from the rear of the module. Dip sw-A is used for selecting an input range.
Dip switch bank A normal operation
Dip Switch Bank B
The following illustration shows sw-B. It is used to select input averaging.
DIP switch bank B-normal operation
NOTE: Both sw-A and sw-B follow the same switch setting conventions:
  • on, closed, left, and logic "1" all mean the same.
  • off, open, right, and "logic 0" all mean the same.
  • The switch bank views shown are looking at the back of the module.
Setting Input Range
sw-A settings for all input ranges for both 8 and 4 input configurations, respectively, are shown in the following tables. sw-A has two functions in addition to input range setting
Inputs Group A (8 Circuit Mode)
The following table describes the input ranges for group A (inputs 1 - 4):
Input Range
Switch
On
Off
1 - 5 V
4 - 20 mA
A-1
X
A-2
X
A-3
X
0 - 10 V
A-1
X
A-2
X
A-3
X
0 - 5 V
A-1
X
A-2
X
A-3
X
+/- 10 V
A-1
X
A-2
X
A-3
X
+/- 5 V
A-1
X
A-2
X
A-3
X
Inputs Group B (8 Circuit Mode)
The following table describes the input ranges for group B (inputs 5 - 8):
Input Range
Switch
On
Off
1 - 5 V
4 - 20 mA
A-4
X
A-5
X
A-6
X
0 - 10 V
A-4
X
A-5
X
A-6
X
0 - 5 V
A-4
X
A-5
X
A-6
X
+/- 10 V
A-4
X
A-5
X
A-6
X
+/- 5 V
A-4
X
A-5
X
A-6
X
Inputs Group A (4 Circuit Mode)
The following table describes the input ranges for group A (inputs 1 - 2):
Input Range
Switch
On
Off
1 - 5 V
4 - 20 mA
A-1
X
A-2
X
A-3
X
0 - 10 V
A-1
X
A-2
X
A-3
X
0 - 5 V
A-1
X
A-2
X
A-3
X
+/- 10 V
A-1
X
A-2
X
A-3
X
+/- 5 V
A-1
X
A-2
X
A-3
X
Inputs Group B (4 Circuit Mode)
The following table describes the input ranges for group B (inputs 3 - 4):
Input Range
Switch
On
Off
1 - 5 V
4 - 20 mA
A-4
X
A-5
X
A-6
X
0 - 10 V
A-4
X
A-5
X
A-6
X
0 - 5 V
A-4
X
A-5
X
A-6
X
+/- 10 V
A-4
X
A-5
X
A-6
X
+/- 5 V
A-4
X
A-5
X
A-6
X
Setting Input Averaging
It is possible to compensate for spurious noise and other forms of amplitude modulation coming through the analog input filter by making the latest input sample part of a moving average–a form of digital filtering. This moving average technique has no affect upon the update interval.
The following tables show sw–B setting for selecting among seven input average sample periods for both 8 and 4 circuit configurations.
sw–B has other functions in addition to average sampling; switch B7 is set to on for binary code output or off for decimal code output for group A (inputs 1-4 in the 8 circuit mode and inputs 1-2 in the 4 circuit mode). Switch B8 does the same for group B.
SW-B Settings Group A (8 Circuit Mode)
The following table describes sw–B Settings for all periods of input averaging (eight circuits) for group A (inputs 1 - 4):
No. of samples averaged
Switch
On
Off
1
B-1
X
B-2
X
B-3
X
2
B-1
X
B-2
X
B-3
X
4
B-1
X
B-2
X
B-3
X
8
B-1
X
B-2
X
B-3
X
16
B-1
X
B-2
X
B-3
X
32
B-1
X
B-2
X
B-3
X
64
B-1
X
B-2
X
B-3
X
SW-B Settings Group B (8 Circuit Mode)
The following table describes sw–B Settings for all periods of input averaging (eight circuits) for group B (inputs 5 - 8):
No. of samples averaged
Switch
On
Off
1
B-4
X
B-5
X
B-6
X
2
B-4
X
B-5
X
B-6
X
4
B-4
X
B-5
X
B-6
X
8
B-4
X
B-5
X
B-6
X
16
B-4
X
B-5
X
B-6
X
32
B-4
X
B-5
X
B-6
X
64
B-4
X
B-5
X
B-6
X
SW-B Settings Group A (8 Circuit Mode)
The following table describes sw–B Settings for all periods of input averaging (eight circuits) for group A (inputs 1 - 2):
No. of samples averaged
Switch
On
Off
1
B-1
X
B-2
X
B-3
X
2
B-1
X
B-2
X
B-3
X
4
B-1
X
B-2
X
B-3
X
8
B-1
X
B-2
X
B-3
X
16
B-1
X
B-2
X
B-3
X
32
B-1
X
B-2
X
B-3
X
64
B-1
X
B-2
X
B-3
X
SW-B Settings Group B (8 Circuit Mode)
The following table describes sw–B Settings for all periods of input averaging (eight circuits) for group B (inputs 3 - 4):
No. of samples averaged
Switch
On
Off
1
B-4
X
B-5
X
B-6
X
2
B-4
X
B-5
X
B-6
X
4
B-4
X
B-5
X
B-6
X
8
B-4
X
B-5
X
B-6
X
16
B-4
X
B-5
X
B-6
X
32
B-4
X
B-5
X
B-6
X
64
B-4
X
B-5
X
B-6
X