PROGRAMMING GUIDE
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Example 3: Digital output for speed thresholds
Suppose that a digital output energizes if the motor speed exceeds 100rpm as an absolute value, and de-energizes
when the motor speed is lower than or equal to 20rpm (as an absolute value). Parameter P270 sets ABS mode, so that
the selected variables are considered as absolute values. The condition “greater than” is selected for test A, and “lower
than/equal to” is selected for test B.
Table 52: MDO parameterization for speed thresholds
P270
MDO1: Digital output mode
DOUBLE ANALOG
P271
MDO1: Variable A selection
A71: Speed MEA
P272
MDO1: Variable B selection
A71: Speed MEA
P273
MDO1: Testing variable A
ABS(x) >
P274
MDO1: Testing variable B
ABS (x)
≤
P275
MDO1: Comparing value for Test A
100.00 rpm
P276
MDO1: Comparing value for Test B
20.00 rpm
P277
MDO1: Function applied to the result of the two tests
(A) Set (B) Reset Rising Edge
P277a
MDO1: Variable C selection
D0: Disabled
P277b
MDO1: Function applied to the result of f(A,B) and C test
P278
MDO1: Output logic level
TRUE
Both tests are performed over the motor speed;
P271
,
P272
are set to “motor speed”. The values of reference for the
two tests are 100rpm and 20rpm; the function applied is Flip Flop Set Reset and the output is considered as a true logic.
Test A is the Set signal of the Flip Flop and Test B is the Reset signal
.
Figure 37: Digital output for speed thresholds (example)
