FB_BA_MotorStpCtrl

The function block FB_BA_MotorStpCtrl is used to control multi-stage drives. The program always starts at level 1 and, depending on the requirements of nValue, switches step by step to the next higher level. Switching up and down into the individual steps is influenced by the 3 time specifications nStepUpDly, nStepDwnDly and nChangOverTime.

In case of a restart or by removing the enable, a restart of the drive is inhibited for the time period of (nOut * nStepDwnDly). This time course is indicated by the output variable nRemRelease. Internally the last active state of nOut is persistently stored for the calculation of the blocking time.

Example

Error handling

The limitation of the input value nNumOfStp is monitored and corrected internally.

nNumOfStp < 1 is adjusted to the value 1 and a detailed description is output via the ErrorDescription property.

nNumOfStp > 9 is adjusted to the value 9 and a detailed description is output via the ErrorDescription property.

In addition, a warning message is output in the Error List window of the TwinCAT programming tool.

The limitation of the input value nValue is monitored and corrected internally.

nValue < 1 is adjusted to the value 1 and via the property ErrorDescription a detailed description is output.

nValue > 9 is adjusted to the value 9 and via the property ErrorDescription a detailed description is output.

In addition, a warning message is output in the Error List window of the TwinCAT programming tool.

Inputs

VAR_INPUT
  bEn       : BOOL;
  nValue    : UDINT;
END_VAR

Name	Type	Description
bEn	BOOL	General enable of the function block. If bEn is FALSE, then all output variables are FALSE or have the value 0.
nValue	UDINT	Step to be controlled from 1 to 9.

nValue	Request
1	Off
2	bStep01
3	bStep02
4	bStep03
5	bStep04
6	bStep05
7	bStep06
8	bStep07
9	bStep08

Inputs CONSTANT PERSISTENT

VAR_INPUT CONSTANT PERSISTENT
  nStepUpDly        : UDINT := 3000;
  nStepDwnDly       : UDINT := 1000;
  nChangOverTime    : UDINT := 100;
  nNumOfStp         : UDINT := 4;
END_VAR

Name	Type	Description
nStepUpDly	UDINT	Minimum switch-on time of the respective step [ms].
nStepDwnDly	UDINT	Switch-back time or switch-off time of the steps [ms].
nChangOverTime	UDINT	Time delay for the changeover phase when switching up [ms] between the steps in order to protect the motor windings. During this time, all outputs are FALSE and nOut = 1.
nNumOfStp	UDINT	Input of the number of steps required. The input is limited to a range from 1 to 9.

Outputs

VAR_OUTPUT
  nOut                 : UDINT;
  bStep01              : BOOL;
  bStep02              : BOOL;
  bStep03              : BOOL;
  bStep04              : BOOL;
  bStep05              : BOOL;
  bStep06              : BOOL;
  bStep07              : BOOL;
  bStep08              : BOOL;
  nRemStepUpDly        : UDINT;
  nRemStepDwnDly       : UDINT;
  nRemChangOverTime    : UDINT;
  nRemRelease          : UDINT;
END_VAR

Name	Type	Description
nOut	UDINT	Output of the currently valid step from 1 to 9.
bStep0N	BOOL	Output of step N depending on the stepped output signal nOut.
nRemStepUpDly	UDINT	Remaining time of the minimum switch-on time of the respective step [ms].
nRemStepDwnDly	UDINT	Remaining time of the switch-back time or switch-off time of the steps [ms].
RemChangOverTime	UDINT	Remaining time of the changeover time when switching up and down [ms].
nRemRelease	UDINT	Remaining time of the internal blocking of the function block after a restart or by removing the enable bEn [ms].

Properties

Name	Type	Access	Description
ErrorDescription	T_MaxString	Get	Issues a detailed description of errors, see error handling.
NumberOfSteps	UDINT	Get	Outputs the current or corrected value of the number of steps. In the error case of nNumOfStp there is a detailed description of the error at error handling.
Step	STRING	Get	Output of the current step depending on nOut.

Requirements

Development environment	Required PLC library
TwinCAT from v3.1.4024.22	Tc3_BA2 from v5.2.5.0