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AL 2000 User Guide
06/05/00
Example 1
If
P term = 100
D term = 0
I term = 0
Then a 1% change in input signal would produce a 1% change in output signal
Example 2
If
P term = 50
D term = 0
I term = 0
Then a 1% change in input signal would produce a 2% change in output signal
The P term can also be used where the input and output signals are not in the same
range (e.g. If the input signal range is 0-1000 and the output signal range is 0-100 we
need a value P=1000. This would result in a gain of 1).
All controllers provide three-point control outputs in the form of bit data in register outputs R O 136-143.
Controller No.:
Close output:
Open output:
R O 136 bit
R O 140 bit
0
0
0
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
Controller No.:
Close output:
Open output:
R O 137 bit
R O 141 bit
8
0
0
9
1
1
10
2
2
11
3
3
12
4
4
13
5
5
14
6
6
15
7
7
Controller No.:
Close output:
Open output:
R O 138 bit
R O 142 bit
16
0
0
17
1
1
18
2
2
19
3
3
20
4
4
21
5
5
22
6
6
23
7
7
Controller No.:
Close output:
Open output:
R O 139 bit
R O 143 bit
24
0
0
25
1
1
26
2
2
27
3
3
28
4
4
29
5
5
30
6
6
31
7
7
The pulse interval, i.e. the dead time that the controller will wait for the process response
to settle, is programmed into register outputs R O 132-135. The time range is from 0.1s
to 25.5s, corresponding to the numbers 1-255.
R O 132
R O 133
R O 134
R O 135
Controllers 0-7
Controllers 8-15
Controllers 16-23
Controllers 24-31
A typical application, controlling the temperature of the circulating water in a central
heating system, is shown over the page.
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