Table 6-10. Examples Of Cpu Load - ABB Advant Controller 450 Product Manual

3BSE 015 953R201 Rev B
Type
PI loop A simple analog control loop consisting of: 1 DB
element AI, 1 DB element AO, 1 PC element PI,
2 arithmetic and 3 logic PC elements
PID loop An advanced process control loop consisting of:
1 DB element AI, 1 DB element AO and 1 PID-
CON-loop. Arithmetic and logic PC elements
Adaptive PID An advanced adaptive control loop consisting of:
loop 1 DB element AI, 1 DB element AO and
1 PIDCONA-loop. Some arithmetic and logic
PC elements
PID loop 2 DB elements AI, 2 DB elements DO, 1 PIDCON
pulsed output loop, 1 PC element CON-PU1 and Some arithmetic
and logic PC elements
Ratio station 1 DB element AI and 1 RATIOSTN
Motor control 1 1 DB element DO and 1 MOTCON
Motor control 2 1 DB element AI, 1 DB element DO, 1 MOTCON
and logic PC elements
(1) If digital inputs change frequently the load from interrupt-detected changes can be extensive. Each change takes
about 0.6 ms to handle. Example: If a DI changes its state once a second on the average, this will give rise to a
0.06% additional load per channel.
Description
50 DI
500 DI
50 DO
500 DO
50 AI
30 PIDCON
30 PIDCONA
10 PIDCON
50 Motor controls 1
50 Motor controls 2
Table 6-9. Execution times (Continued)
Description

Table 6-10. Examples of CPU load

Advant Controller 450 Product Guide
Section 6.9 CPU Load Calculation
Execution time
PC cycle time (ms) CPU load (%)
50
250
50
250
1000
1000
1000
2000
1000
1000
(ms)
0.5
0.8
1.0
1.0
0.4
0.4
0.7
2
4
2
4
1
2.5
3
0.5
2
3.5
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