Lenze DDS v2.3 Bedienungsanleitung PDF herunterladen (Seite 307)

100

101

Drive PLC Developer Studio

IEC 61131-3 Standard functions

14-15

l DDS EN 2.3

14.6.3 CTUD

Up and down counter

CU, CD, RESET, LOAD, QU and QD are of type BOOL, PV and CV are of type INT.

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

• If LOAD is valid, CV will be initialized with PV .

• If positive edge CU is valid, CV will be increased by 1 as long as CV does not cause an

overflow.

• If positive edge CD is valid, CV will be decreased by 1 as long as CV does not cause an

underflow.

• QU returns TRUE if CV has become greater than or equal to PV.

• QD returns TRUEif CV has become less than or equal to 0.

CTUD(CU, CD, RESET, LOAD, PV, QU, QD, CV)

Examples

Declaration:

CTUDInst : CTUD;

IL FBD

CAL CTUDInst(CU:=VarBOOL2, RESET:=VarBOOL32,

LOAD:=VarBOOL4; PV:=VarINT1)

LD CTUDInst.QU

ST VarBOOL5

LD CTUDInst.QD

ST VarBOOL6

LD CTUDInst.CV

ST VarINT2

CTUDInst(CU:=VarBOOL2, RESET:=VarBOOL32, LOAD:=VarBOOL4; PV:=VarINT1);

VarBOOL5:=CTUDInst.QU;

VarBOOL6:=CTUDInst.QD;

VarINT2:=CTUDInst.CV;

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