Spectrum Controls 140 ACI 052 00sc - Manual (Page 47)

41
Installation Instructions
32-Channel Analog Input Module
Quantum 140 ACI 052 00sc
5.3 Differential Field wiring
Differential mode performs a software difference of two consecutive channel
inputs, and reports the data on the first channel register of the pair. The second
channel’s output is zero. The data acquisition between the two channels is not
synchronized so common mode noise on the signal pair may not be fully
removed, however DC offsets should be compensated for correctly.
☞ Note: The channel pairs are not being measured simultaneously, this could lead to an error in the
actual differential value that is calculated.
☞ Note: Differential mode only applies to voltage inputs.
7
1
6
1
3
5
9
1
1
1
3
1
5
1
7
1
9
2
1
2
3
2
5
2
7
2
9
3
1
3
3
3
5
3
7
3
9
2
4
6
8
1
0
1
2
1
4
1
8
2
0
2
2
2
4
2
6
2
8
3
0
3
2
3
4
3
6
3
8
4
0
(IN+)6
(IN+)2
(IN+)1
COM GROUP 1
(IN-)3
(IN+)5
(IN-)8
(IN+)14
(IN-)19
(IN-)9
COM GROUP 3
(IN-)11
(IN+)13
(IN-)12
(IN-)16
(IN-)15
COM GROUP 4
(IN-)8
(IN-)7
COM GROUP 2
COM GROUP 4
(IN+)16
(IN+)15
COM GROUP 2
(IN+)8
(IN+)7
(IN-)28
(IN+)10
(IN+)9
(IN+)11
(IN+)12
(IN-)13
COM GROUP 3
(IN-)6
(IN-)2
(IN-)1
(IN+)3
(IN+)4
(IN-)5
COM GROUP 1