Supported platforms: CODESYS 2.3, CODESYS 3.5
This function calculates P and I values from given coil resistance, if both given P and I values are 0.
Fast:
o_P_Gain = i_CoilResistance * G_PVC_FAST_P_GAIN_SLOPE + G_PVC_FAST_P_GAIN_ZERO
Value is limited to G_PVC_FAST_P_HIGH_LIMIT.
o_I_Gain = i_CoilResistance * G_ PVC_FAST_I_GAIN_SLOPE + G_PVC_FAST_I_GAIN_ZERO
Slow:
o_P_Gain = i_CoilResistance * G_ PVC_SLOW_P_GAIN_SLOPE + G_PVC_SLOW_P_GAIN_ZERO
Value is limited to G_PVC_SLOW_P_HIGH_LIMIT.
o_I_Gain = i_CoilResistance * G_ PVC_SLOW_I_GAIN_SLOPE + G_PVC_SLOW_I_GAIN_ZERO
With values of Global variables, P and I gain curves look like these:
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The purpose of this function is to provide basic P and I values for the controller. The user can override them by giving P and I values to inputs. |
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This function block is primarily intended for ProportionalValveControl library's internal use. |
Input variable name |
Data type |
Range |
Description |
i_Enable |
BOOL |
TRUE/FALSE |
Enable setting of output parameters. |
i_Fast |
BOOL |
TRUE/FALSE |
Select faster set of pre-scaled values. |
i_P_Gain |
UINT |
0..65535 |
Proportional gain value. If set to 0, both outputs are set from pre-scaled value table. |
i_I_Gain |
UINT |
0..65535 |
Integration gain value. If set to 0, both outputs are set from pre-scaled value table. |
i_CoilResistance |
UINT |
3..200 Ohm |
Coil resistance. |
Output variable name |
Data type |
Range |
Description |
o_P_Gain |
UINT |
0..65535 |
Output proportional gain value. |
o_I_Gain |
UINT |
0..65535 |
Output integration gain value. |
Source file Topic000470.htm
Last updated 21-Feb-2025
