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PowerFlex40 Step Logic May 2003

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Logic Functions It starts with a philosophy Step Logic Logical functions Digital Input AND, OR, NOR Timer Function Digital Output(s) used Counter Function Digital Output(s) used

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Step Logic Function Up to 8 step available (0 – 7) [Stp Logic 0 – 7] parameters A140 – A147 Uses Preset Frequencies only [Preset Freq 0 – 7] parameters (A070 – A077) Time Based Steps [Stp Logic Time 0 – 7] parameters A150 – A157 [Speed Reference] P038 setting Stp Logic

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Step Logic Example Step 0Step 1Step 2Step 3Step 4Step 5Step 6Step 7 0 FWD REV time

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Logic Function Digital Inputs Logic In1 & Logic In2 Logic Programming Define logic required for machine Digital Outputs On or Off depending on the state of the logic inputs. Can be used with or without Step Logic

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Logic Example Step 0Step 1Step 2 Logic In1 Logic In2 StartStep 3 Freq

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Timer Function Digital Inputs Timer Start, Reset Timer, Reset Timer & Counter Digital Output(s) Set Timer level Output changes state when level reached Can be used with or without Step Logic

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Timer Example Preset Freq 1 Analog Reference Start Relay Out Digital In1 Preset Freq Digital In2 Timer Start 30 Hz 20 sec

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Counter Function Digital Inputs Counter In, Reset Counter, Reset Timer & Counter Digital Output(s) Set Count level Output changes state when level reached Can be used with or without Step Logic

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Counter Example Output Freq Start Relay Out Photo eye Digital In1 Counter In Digital In2 Reset Counter Limit Switch

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Step Logic Programming 4 digit code defines step actions Digit 3 Defines the action during the current step Digit 2 Defines what step to jump to when Digit 1 logic met Digit 1 Defines the logic required for the jump Digit 0 Defines the logic for the next step (numeric progression)

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Logic Codes

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Applications for Step Logic Speed profile based on time Simple indexing Fwd & Rev with coarse positioning using presence sensors. Traversing Fwd & Rev of carriage with coarse positioning using presence sensors. Parts counter and diverter

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