Allen-Bradley LOGIX 5000 Reference Manual page 288

Controllers advanced process control and drives and equipment phase and sequence instructions

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the multipliers of both instructions being a ratio of 1/4, motor B needs to rotate

once for every four revolutions of Motor A in order to maintain an accumulated

value of zero in the UPDN accumulator. Any value other than zero on the output

of the UPDN instruction is viewed as Position_error and can be regulated and

driven back out to motor B in order to maintain a phase-lock between the two

Function Block

Structured Text

PMUL_02.In := Position_feedback;

PMUL_02.Initalize := Initialize_Position;

PMUL_02.WordSize := 12;

PMUL_02.Multiplier := 25000;

PMUL(PMUL_02);

PMUL_03.In := Follower_Position;

PMUL_03.Initalize := Initialize_Position;

PMUL_03.WordSize := 12;

PMUL_03.Multiplier := 100000;

PMUL(PMUL_03);

UPDN_02.Initialize := Initialize_Position;

UPDN_02.InPlus := PMUL_02.Out;

UPDN_02.InMinus := PMUL_03.Out;

UPDN(UPDN_02);

Rockwell Automation Publication 1756-RM006K-EN-P - November 2018

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