Use with hardware that has a built-in current controller (i.e. mA value is written to output) or with PVC_AdaptiveController.
Supported platforms: CODESYS 2.3, CODESYS 3.5
PVC_SingleCurrentValve function block controls one current controlled proportional valve in products that have a controller built in at firmware, like Epec 5050.
The FB calls PVC_Attenuation FB and one of the ramp FBs according to the user’s selection.
The FB uses PVC_To_CurrentReq function to scale the control signal to current requests.
The FB checks input parameters to ensure their valid values. In case of an incorrect value in any of the parameters, o_ParameterError output is activated.
If i_Enable is inactive or in case of a parameter error or AI voltage error, the current request output is set to zero.
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Use with hardware that has a built-in current controller (i.e. mA value is written to output) or with PVC_AdaptiveController. |
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i_Control must be 0 on the rising edge of i_Enable status. Otherwise control is not enabled. |
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When the linear ramp type is selected, the ramp speed changes when the current parameters are changed. |
Input variable name |
Data type |
Range |
Description |
i_Enable |
BOOL |
FALSE/TRUE |
Enables controlling of the o_CurrentRequest output. |
i_Control |
INT |
0..32767 |
Control signal from e.g. pedal. |
i_MaxCurrent |
UINT |
1..2500 mA |
Maximum current for valve. |
i_MinCurrent |
UINT |
1..2500 mA |
Minimum current for valve. |
i_RampType |
BYTE |
0..G_RampTypeMax |
Defines which one of the available ramp functions is used. |
i_AscendRamp |
UINT |
Ramp specific |
Ascending speed for valve, range and unit depends on selected ramp type. |
i_DescendRamp |
UINT |
Ramp specific
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Descending speed for valve, range and unit depends on selected ramp type. |
i_AttenuationOn |
BOOL |
FALSE/TRUE |
If input is true, controlling is limited to given percentage of max control. |
i_AttenuationAmount |
BYTE |
0..100% |
Amount of attenuation. |
Output variable name |
Data type |
Range |
Description |
o_CurrentRequest |
UINT |
0..2500 mA |
Current request for valve. |
o_ParameterError |
BOOL |
FALSE/TRUE |
True when incorrect parameter value in any of the FB’s input. |
Output variable name |
Data type |
Range |
Description |
o_CurrentRequest |
UINT |
0..2500 mA |
Current request for valve. |
o_ParameterError |
BOOL |
FALSE/TRUE |
True when incorrect parameter value in any of the FB’s input. |
o_IllegalControlRequestInStartup |
BOOL |
FALSE/TRUE |
True if unexpected control request occurs. i_Control is not 0 when i_Enable is set to true. |
Source file Topic000333.htm
Last updated 21-Feb-2025
