FB_Cylinder

 Function Block A function block groups an algorithm and a set of private data. It has inputs and outputs. - Used to control a cylinder and the Limit Switches.

Inputs

Input	Data Type	Range	Unit	Default	Description
iInA	BOOL				Set direction A.
iInB	BOOL				Set direction B.
iLsA	BOOL				Limit Switch at end of direction A.
iLsB	BOOL				Limit Switch at end of direction B.
iCtrlTime	TIME				Max time until LimitSwitch has to be reached.
iResetFault	BOOL				Reset Fault (is set to FALSE by UDFB "User Defined Function Block" UDFB can be used as a sub-function block in another program of the application. It is described using FBD, LD, ST or IL language. Input / output parameters of a UDFB (as well as private variables) are declared in the variable editor as local variables of the UDFB!).

Outputs

Output	Data Type	Range	Unit	Description
oDirA	BOOL			Direction A.
oDirB	BOOL			Direction B.
oFaultLsA	BOOL			Fault of LimitSwitch at the end of direction A.
oFaultLsB	BOOL			Fault of LimitSwitch at the end of direction B.

Remarks

• There are two inputs, iLnA and iInB, to set the direction of the movement and the belonging LimSwitches iLsA and iLsB.
• If iInA is set to TRUE, the output oDirA is set to TRUE.
  • After a time value defined by CtrlTime, the iLsA has to become TRUE otherwise a fault FaultLsA appears.
    • Just as in direction B.
• If both iLsA and iLsB are TRUE, then a Fault depending of the output is set.
• If both iLnA and iLnB are given (e.g., to stop the cylinder movement), no limit switch is controlled.
• All faults can be reset by input iResetFault.

Usage

• The signal flow is valid for both directions (A and B)
• If oDirA AND oDirB are active there is no Fault Control.
• The Fault can be reset by iRestFault = True.

FBD Language Example

FFLD Language Example

IL Language Example

Not available.

ST Language Example

//Electric Cylinder with limit switch controls
Inst_FB_Cylinder( dirA, dirB, LimitSwitchA, LimitSwitchB, CtrlTime, ResetFault );
A := Inst_FB_Cylinder.oDirA;
B := Inst_FB_Cylinder.oDirB;
FaultLimitSwitchA := Inst_FB_Cylinder.oFaultLsA;
FaultLimitSwitchB := Inst_FB_Cylinder.oFaultLsB;