Lenze DDS v2.3 Bedienungsanleitung PDF herunterladen (Seite 306)

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IEC 61131-3 Standard functions

14-14

DDS EN 2.3

14.6 Counters

14.6.1 CTU

Up counter

CU, RESET and Q are of type BOOL, PV and CV are of type INT.

• If RESET is TRUE, the counter variable CV is set to 0.

• Every positive edge at input

CU increases CV

by 1.

As long as

is less than

max (i.e. no overflow).

• Q returns TRUE if CV is greater than or equal to the upper limit PV .

CTU(CU, RESET, PV, Q, CV) means:

• If RESET is TRUE, the counter variable CV will be initialized with 0.

• If CU has a rising edge, CV will be increased by 1.

Examples

Declaration:

CTUInst : CTU;

IL FBD

CAL CTUInst(CU:=VarBOOL1, RESET:=VarBOOL2, PV:=VarINT1)

LD CTUInst.Q

ST VarBOOL3

LD CTUInst.CV

ST VarINT2

CTUInst(CU:=VarBOOL1, RESET:=VarBOOL2, PV:=VarINT1);

VarBOOL3:=CTUInst.Q;

VarINT2:=CTUInst.CV;

14.6.2 CTD

Down counter

CD, LOAD and Q are of type BOOL, PV and CV are of type INT.

• If LOAD is TRUE, the counter variable CV will be set equal to the upper limit PV.

• If LOAD is FALSE, every function block call will decrease CV by 1.

• Q returns TRUE if CV is less than or equal to 0.

CTD(CD, LOAD, PV, Q, CV)

Examples

Declaration:

CTDInst : CTD;

IL FBD

CAL CTDInst(CD:=VarBOOL1, LOAD:=VarBOOL2, PV:=VarINT1)

LD CTDInst.Q

ST VarBOOL3

LD CTDInst.CV

ST VarINT2

CTUInst(CD:=VarBOOL1, LOAD:=VarBOOL2, PV:=VarINT1);

VarBOOL3:=CTDInst.Q;

VarINT2:=CTDInst.CV;

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