| author | Mario de Sousa <msousa@fe.up.pt> |
| Thu, 02 Feb 2012 14:18:02 +0000 | |
| changeset 420 | 866eb35e4e14 |
| parent 276 | 1679f514f38a |
| permissions | -rwxr-xr-x |
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(* Following taken directly from the IEC 61131.3 draft standard *) |
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(* |
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* An IEC 61131-3 IL and ST compiler. |
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* |
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* Based on the |
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
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* |
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*) |
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FUNCTION_BLOCK DERIVATIVE |
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VAR_INPUT |
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RUN : BOOL ; (* 0 = reset *) |
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XIN : REAL ; (* Input to be differentiated *) |
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CYCLE : TIME ; (* Sampling period *) |
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END_VAR |
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VAR_OUTPUT |
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XOUT : REAL ; (* Differentiated output *) |
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END_VAR |
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VAR X1, X2, X3 : REAL ; END_VAR |
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IF RUN THEN |
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XOUT := (3.0 * (XIN - X3) + X1 - X2) |
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/ (10.0 * TIME_TO_REAL(CYCLE)) ; |
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X3 := X2 ; X2 := X1 ; X1 := XIN ; |
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ELSE XOUT := 0.0; X1 := XIN ; X2 := XIN ; X3 := XIN ; |
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END_IF ; |
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END_FUNCTION_BLOCK |
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