FB_Cylinder

 Function Block - Used to control a cylinder and the Limit Switches.

Inputs

Input	Data Type	Range	Unit	Default	Description
iInA	BOOL	FALSE, TRUE	N/A	No default	Set direction A.
iInB	BOOL	FALSE, TRUE	N/A	No default	Set direction B.
iLsA	BOOL	FALSE, TRUE	N/A	No default	Limit Switch at end of direction A.
iLsB	BOOL	FALSE, TRUE	N/A	No default	Limit Switch at end of direction B.
iCtrlTime	TIME	0ms - 24hr	TIME	No default	Max time until LimitSwitch has to be reached.
iResetFault	BOOL	FALSE, TRUE	N/A	No default	Reset Fault (is set to FALSE by UDFB!).

Outputs

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

Figure 1: FB_Cylinder Usage 1

Figure 2: FB_Cylinder Usage 2

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;