A remote I/O module collects sensor signals and drives actuators close to the machinery, then passes them to the PLC or automation system over a bus. It replaces long bundles of individual cables with a short local connection and a single data link.
80 models from 13 manufacturers. Below: the manufacturers at a glance and the full model list.
In a classical automation system every sensor and valve is wired back to a central cabinet. With remote I/O, an input/output module is installed near the equipment, collects the signals from the field devices and sends them to the controller over a fieldbus or industrial Ethernet. That saves cable, reduces installation time and makes it easier to extend a system later. On a ship, the modules sit in engine rooms, on deck and in local panels, so they have to cope with heat, vibration and electrical noise from converters and generators. A single module may carry dozens of signals, which makes its failure more significant than that of a single sensor.
Automation components used for essential services need type approval from the classification society, including tests for vibration, temperature, humidity and electromagnetic compatibility. The certificate covers a defined product range and firmware status, so a module from the same family but a different version may not be covered. Safety-related I/O used in shutdown or fire-detection functions may need an additional safety integrity level rating under the relevant functional-safety standard.
Keep a spare coupler and one spare module of each type in the engine control room, with the configuration file stored on paper or a separate drive. It turns a night-time alarm into a ten-minute swap.
The best-documented model of each manufacturer first, then the next — 80 of 80 models in Remote I/O Module. Every row links to full specifications, documents and service notes.
All 13 manufacturers with models of Remote I/O Module. Names with a manufacturer page open it; the others open a search across the full library.
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