PLC FAT and SAT checklist: test behavior and handover evidence
Plan factory and site acceptance around requirements, observable results, failure states, approved changes and recoverable project files.
Remote I/O
Distributed I/O connected to a controller over an industrial network.
Input/output modules installed near field devices and linked to a controller over an industrial network. Remote I/O reduces cabinet wiring and can provide diagnostics, isolation, and modular expansion, but network and power design remain critical.
See also: PLC · Fieldbus · PROFINET
Use the concept: 4–20 mA loop scaling · Industrial automation fundamentals · Modbus RTU CRC & frame helper
In depth
PLC analog input scaling: raw counts, 4–20 mA and diagnostics
Map raw counts into engineering units, check the configured channel range, and keep signal-quality diagnostics separate from the displayed value.
OT backup and restore testing: prove the recovery path
Inventory the files and dependencies needed to recover a control system, set recovery objectives, and test restoration on an isolated target.