A parameter error is diagnosed if:
-
Init method is not called before the main FB call OR
-
i_pEventCode = 0 OR
Supported platforms: CODESYS 3.5, CODESYS 3.5 SAFETY, CODESYS 3.5 SP19 SAFETY
This function block limits the acceleration and deceleration speed of movements controlled by PWM output.
Init method is used to initialize the necessary static calculation parameters for the function block instance.
The method shall be called at least once before the actual function block can be called, i.e. at the application initialization phase.
The method checks the validity of input parameters. However, none of the function block outputs are affected by the initialization.
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A parameter error is diagnosed if:
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|
Parameter |
Data type |
Unit |
Range |
Description |
|
S_i_PosDirAscendRampTime |
SAFEUINT |
ms |
- |
Defines time how long it takes that control signal S_o_PosControl changes from 0 to 10000 |
|
S_i_PosDirDescendRampTime |
SAFEUINT |
ms |
- |
Defines time how long it takes that control signal S_o_PosControl changes from 10000 to 0 |
|
S_i_NegDirAscendRampTime |
SAFEUINT |
ms |
- |
Defines time how long it takes that control signal S_o_NegControl changes from 0 to -10000 |
|
S_i_NegDirDescendRampTime |
SAFEUINT |
ms |
- |
Defines time how long it takes that control signal S_o_NegControl changes from -10000 to 0 |
|
S_i_EnableCounterControl |
SAFEBOOL |
- |
- |
True = S_o_PosControl and S_o_NegControl can be active at same time.
False = S_o_PosControl and S_o_NegControl cannot be active at same time. |
|
i_pEventCode |
POINTER TO EventCode |
- |
≠0 |
Pointer to application variable which is type EventCode. |
|
TRUE: All initialization parameters ok. |
|
FALSE: Error in initialization parameter(s). |
The output values S_o_PosControl and S_o_NegControl follows the input value S_i_Control according the ramp parameters. POU has own parameters for positive and negative direction. Ascend and descend parameters defines the time it takes from control signal to change full range 0-10000 or in negative side 0- (-)10000. The output values are calculated based on input value, ascend ramp, descend ramp, application cycle time and S_i_EnableCounterControl flag. In other word the POU limits the change speed of control signal. The S_i_EnableCounterControl flag defines if outputs S_o_PosControl and S_o_NegControl can be active at same time
See figure below where S_i_NegDirAscendRampTime = 200, S_i_NegDirDescendRampTime = 300, S_i_PosDirAscendRampTime = 100 and S_i_EnableCounterControl = TRUE.
See figure below where S_i_NegDirAscendRampTime = 200, S_i_NegDirDescendRampTime = 300, S_i_PosDirAscendRampTime = 100 and S_i_EnableCounterControl = FALSE.
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Input variable name |
Data type |
Unit |
Range |
Description |
|
i_Enable |
BOOL |
- |
- |
Enable POU operation |
|
S_i_Control |
SAFEINT |
- |
-10000 - (+)10000 |
Control value |
|
Output variable name |
Data type |
Unit |
Range |
Description |
|
S_o_PosControl |
SAFEINT |
- |
0-10000 |
Positive direction ramped value. |
|
S_o_NegControl |
SAFEINT |
- |
-10000-0 |
Negative direction ramped value. |
|
o_Status |
Status |
- |
|
Status of output value. See Status structure. |
See Diagnostic Interface library description of error status and event code functionality.
|
Conditions |
S_o_ Control |
o_Status. OutputValid |
o_Status error status |
Event code FunctionID |
Event code EventID |
|
i_Enable TRUE AND init parameter error AND i_pEventCode valid |
0 |
FALSE |
ParameterError |
LINEAR_RAMP |
PARAMETER_ERROR |
|
i_Enable TRUE AND init parameter error AND |
0 |
FALSE |
ParameterError |
- |
- |
|
i_Enable TRUE AND init parameters ok AND S_i_Control within range |
Attenuated control value |
TRUE |
- |
NO_FUNC |
NO_ERROR |
|
i_Enable TRUE AND init parameters ok AND S_i_Control > 10000 |
0 |
FALSE |
InputHigh |
LINEAR_RAMP |
INPUT_TOO_HIGH |
|
i_Enable TRUE AND parameters ok AND S_i_Control < -10000 |
0 |
FALSE |
InputLow |
LINEAR_RAMP |
INPUT_TOO_LOW |
Source file topic100404.htm
Last updated 21-Feb-2025