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Free Engineering Tools & Practical PLC Guides

LogicHobbyist delivers ad‑supported technical resources for automation engineers, maintenance technicians, and advanced makers. Find tested code, interactive calculators, and real‑world configuration examples – no consulting fees, no hidden costs.

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4‑20mA Scaling Tool

Convert live loop current to engineering units – ideal for pressure, level, or flow transmitters.

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Modbus CRC & PDU Builder

Generate Modbus RTU/TCP frames, calculate CRC‑16, and simulate simple master requests.

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PID Tuning Simulator

Interactive gain scheduling for temperature and flow loops – visual step response.

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Practical Engineering – No Academic Fluff

Every tutorial, code snippet, and calculator on LogicHobbyist is tested on real hardware (Beckhoff CX9020, akYtec PLCs, Modbus RTU networks) or validated with open‑source simulation tools. We focus on tasks you actually face:

  • Wiring a 4‑20mA sensor to a PLC analog input
  • Configuring a Modbus TCP slave on an IMO controller
  • Scaling raw ADC values to engineering units (C, bar, RPM)
  • Reading/writing multiple holding registers via Python
  • Troubleshooting common CRC errors and exception codes
  • Setting up a low‑cost HMI with an Arduino + industrial display

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Why Engineers Use LogicHobbyist

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Tested Code

All examples run on real PLCs or emulators before publication.

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Free Calculators

No registration – use scaling, PID, and protocol tools instantly.

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New to industrial automation? Start with our Logic Basics series – no prior experience required.