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Specify a custom industrial control board and sensor interface by writing down six things before any design discussion: the complete I/O inventory (every sensor input and actuator output with electrical type), the power budget, the communication requirements, the environmental conditions, the acceptance tests you will run, and the documentation you expect to own. KJT Sensors' automation-control business states custom control-board, PCBA and sensor-interface development for OEM equipment; a complete specification is what turns that capability into a predictable project.
The I/O inventory is the specification. Every input (sensor type, output type, voltage, connector) and every output (load type, current, switching logic) must be listed — an incomplete I/O list is the root cause of most custom-board rework.
Electrical compatibility is decided on paper first. NPN/PNP, analog ranges, supply voltages and commons must be confirmed per channel before schematic design; the NPN/PNP matching guide covers the digital-input side.
Acceptance tests belong in the requirement, not in the dispute. Agree the functional, timing and environmental tests — with pass criteria — before development starts.
Documentation ownership decides maintainability. Specify which schematics, firmware, test records and change-control terms you receive.
