What the Position 2 relay and RS-485 mean for your loop
The Omron E5EC-TPR4D5M-004 is a 1/4 DIN process controller with a Position 2 relay output, RS-485 communications, and two event inputs — the relay drives a final control element directly (like a valve actuator or contactor) without an interposing SSR, saving a DIN rail slot and a wiring step. The RS-485 port supports Modbus RTU, which means this controller talks to a PLC or SCADA host over a twisted-pair bus without an extra protocol converter — a common integration pattern in water treatment and packaging lines.
Active production — no LTB watch needed
It ships in Bulk packaging, which means the controller arrives loose in a carton rather than a retail blister — standard for panel-build quantities where the box goes straight to the stockroom shelf.