FB_BA_SeqCtrl
PID sequence controller as part of a sequence.
On receipt of the enable bEn = TRUE, the higher-level control block FB_BA_SequenceLinkBase is informed that the sequence controller is ready for operation for sequence control.
The data exchange between the sequence controllers FB_BA_SeqCtrl and the control block FB_BA_SequenceLinkBase takes place via the structure stSeqLink.
Output value fPresentValue
The function block determines the resulting value at the output fPresentValue depending on the enables bEn and stSequenceLink.bEnSeqLink, the control direction eActionPgm / eActionRm and the sequence number nActvSeqCtrl / nMyNum.
bEn | stSequenceLink.bEnSeqLink | eActionPgm/eActionRm | nActvSeqCtrl/nMyNum | fPresentValue |
|---|---|---|---|---|
TRUE | FALSE | E_BA_Action.eReverse |
| fMaxOutputPgm / fMaxOutputRm |
TRUE | FALSE | E_BA_Action.eDirect |
| fMinOutputPgm / fMinOutputRm |
FALSE | FALSE |
|
| 0 |
TRUE | TRUE | E_BA_Action.eReverse | nActvSeqCtrl > nMyNum | fMinOutputPgm / fMinOutputRm |
TRUE | TRUE | E_BA_Action.eReverse | nActvSeqCtrl < nMyNum | fMaxOutputPgm / fMaxOutputRm |
TRUE | TRUE | E_BA_Action.eDirect | nActvSeqCtrl < nMyNum | fMinOutputPgm / fMinOutputRm |
TRUE | TRUE | E_BA_Action.eDirect | nActvSeqCtrl > nMyNum | fMaxOutputPgm / fMaxOutputRm |
TRUE | TRUE |
| nActvSeqCtrl = nMyNum | FB_BA_Loop.fPresentValue |
Error detection
The error messages listed below are detected by FB_BA_SeqCtrl.
The x in the text messages stands for a numerical specification of a sequence controller.
The error messages are output in the "Error list" window in the Tc3 development environment. This can be activated under the menu item View.
The error texts are output via the properties ErrorParamMaxSeqCtrl and ErrorSeqNumMultiple.
 | Globaler Parameter Tc3_BA2.BA_Param.nMaxSeqCtrl < 1 This message is the only one that disables sequence control. |
German | English |
|---|---|
Globaler Parameter Tc3_BA2.BA_Param.nMaxSeqCtrl < 1 | Global parameter Tc3_BA2.BA_Param.nMaxSeqCtrl < 1 |
Sequenznummer nMyNum = x mehrfach vergeben | Sequence number nMyNum = x assigned multiple times |
Illustration
FUNCTION_BLOCK FB_BA_SeqCtrl EXTENDS FB_BA_Loop
VAR_INPUT
nMyNum : UDINT;
END_VAR
VAR_OUTPUT
fE : REAL;
bSeqActv : BOOL;
nActvSeqCtrl : UDINT;
bIsActvSeqCtrl : BOOL;
bErr : BOOL;
END_VAR
VAR_IN_OUT
stSeqLink : ST_BA_SeqLink;
END_VAR
Outputs
Name | Type | Description |
|---|---|---|
fE | REAL | Displays the control deviation of the sequence controller. This depends on the control direction of the sequence controller. E_BA_Action.eDirect -> fE = fX-fW E_BA_Action.eReverse -> fE = fW-fX |
bSeqActv | BOOL | The sequence controller is implemented in the control sequence. |
nActvSeqCtrl | UDINT | Number of the active sequence controller. |
bIsActvSeqCtrl | BOOL | Indicates that the sequence controller is the active one in the sequence control. The property IsActvSeqCtrl also displays this message. |
bErr | BOOL | Indicates that an error has been detected. More detailed information is shown in the properties ErrorParamMaxSeqCtrl and SeqNumMultiple. Further explanations on error analysis can be found at Error detection. |
/ Inputs Outputs
Name | Type | Description |
|---|---|---|
stSeqLink | Data and command structure between the individual sequence controllers FB_BA_SeqCtrl and the function block FB_BA_SequenceLinkBase. |
Properties
Name | Type | Access | Description |
|---|---|---|---|
ActvSeqCtrl | UDINT | Get | The property shows the number of the active sequence controller. |
ErrorParamMaxSeqCtrl | T_MaxString | Get | The property displays the following text in case of error: "Global parameter Tc3_BA2.BA_Param.nMaxSeqCtrl < 1", see BA_Param.nMaxSeqCtrl. The global parameter must be adjusted in any case, because due to the wrong parameterization the sequence stops. |
SeqNumMultiple | T_MaxString | Get | The property displays the following text in case of error: "Sequence number nMyNum = x assigned multiple times". A check of the displayed sequence number is necessary because it has been assigned several times in the sequence. |
IsActvSeqCtrl | BOOL | Get | The sequence controller is the active one in the sequence control. |
Requirements
Development environment | Required PLC library |
|---|---|
TwinCAT from v3.1.4024.22 | Tc3_BA2 from v5.2.5.0 |