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DIN Rail Modular IO — One Main Board, Add the Modules You Need
One main board plus whatever modules you need, side by side on a rail. All four are 81.5 mm tall and the module bus is 16 pins.
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One main board plus whatever modules you need, side by side on a rail. All four are 81.5 mm tall and the module bus is 16 pins.

Ethernet, CAN and RS-485 on one main module. Only the lines that go out to the field are isolated.

Four relays, four analog inputs, four analog outputs. All three carry their own MCU and run as independent CAN nodes.

The modular IO specification table in one place, plus the DIN rail expansion limits and the design rules for a new module.