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LIB - TIA - POS & NEG EDGE SCALE CONTROL BLOCK

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A4U PEV Positive & Negative Scaling Control Block – Bidirectional Signal Scaling for Precise Solenoid Control

The A4U PEV Positive & Negative Scaling Control Block provides a structured and reusable solution for converting a single analog command into controlled positive and negative output ranges for proportional electro-pneumatic valves and solenoid-driven actuators within PLC-based industrial automation systems. The block performs linear scaling between configurable minimum and maximum input values and separate positive and negative output limits, allowing one command signal to be adapted for bidirectional motion or flow control. Depending on the input level and configured parameters, the logic determines the appropriate output range and generates both a scaled analog output and a digital solenoid-selection signal, making it suitable for applications such as extend/retract, open/close, forward/reverse or other two-direction actuator functions. The block also supports signal reversal, giving engineers additional flexibility when the required actuator direction or hardware wiring is opposite to the original command convention. Configurable positive and negative minimum values can be used to compensate for actuator deadband, while maximum limits help prevent the output from exceeding the intended operating range. Integrated parameter-error monitoring identifies invalid configurations such as reversed or inconsistent input ranges, helping support commissioning and troubleshooting. The manual also describes threshold-based changeover between the two solenoid directions, typically around the centre of the input range, allowing a unipolar command to control two directional outputs in a consistent way. Because it is designed as a standard master control block, it is not dependent on a specific HMI or SCADA platform and can be integrated into different automation architectures according to project requirements. By combining positive and negative scaling, direction selection, deadband compensation, signal reversal, output limiting and parameter validation within one reusable structure, the A4U PEV Positive & Negative Scaling Control Block provides a flexible foundation for reliable bidirectional proportional valve and actuator control.

One Command. Two Directions. Precise Proportional Control.

Simplify bidirectional solenoid control with the A4U PEV Positive & Negative Scaling Control Block. The block converts a single analog input into separate positive and negative output ranges, manages directional solenoid selection, supports signal reversal, compensates for deadband and limits the output to safe configured values. Independent of any specific SCADA platform, it provides a reusable and standardized solution for extend/retract, open/close and other two-direction proportional actuator applications.

FAQs

What is the purpose of the PEV Positive & Negative Edge Scaling Control Block?
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The block is designed to convert an analog input command into scaled output signals suitable for proportional solenoid control in both positive and negative directions. This allows one control signal to be used for bidirectional actuator behavior.
How does the block handle positive and negative actuation?
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The block uses separately configured positive and negative output ranges. Based on the input command level, it determines the required direction and generates the corresponding scaled output for the appropriate solenoid.
How is the analog command scaled?
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The block applies linear interpolation between the configured minimum and maximum input values and maps the command into the defined output range for the selected direction.
What is the purpose of having separate positive and negative output ranges?
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Separate ranges allow each direction of motion to be calibrated independently. This is useful when the two solenoids or actuator directions require different minimum or maximum command levels.
What is the main benefit of using the PEV Positive & Negative Edge Scaling Control Block?
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The main benefit is a standardized way to control bidirectional proportional solenoids from a single analog command while independently managing positive and negative scaling, changeover behavior, deadband compensation, signal reversal, and output limits.

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