The Emerson PACSystems RSTi-EP CPE205 (ordering code EPXCPE205) is a compact programmable automation controller that runs the same control engine and toolchain as the full-size RX3i. It packages a 32-bit embedded processor with dual Gigabit Ethernet ports, PROFINET controller, OPC UA Secure server, and battery-less non-volatile memory into a DIN-rail-mountable form factor — bringing IIoT connectivity and wide-temperature operation to distributed machine control.

What protocols and networks does the CPE205 support?

Two independent 100/1000Mbps RJ45 ports can operate as separate NICs (Dual LAN mode) or as a single switched network (Single LAN mode), each with its own IP address. LAN2 runs the embedded PROFINET controller for up to eight PROFINET devices. The controller also speaks Modbus TCP, SRTP Client/Server, EGD Class 1, HART pass-through, DNP3, and SNTP for time synchronization. OPC UA Secure provides encrypted data access for SCADA and MES integration, with Achilles Level 2 certification for network robustness.

How does it handle harsh environments?

With an operating range of −40°C to +70°C — well beyond the typical 0–60°C of most PLCs — the CPE205 suits outdoor cabinets, remote wellheads, and unheated enclosures. Battery-less NVRAM retains the program and 0.5MB of user data across power cycles without a replaceable battery. Secure Boot prevents unauthorized firmware modifications, and firmware updates deploy via USB stick or encrypted web transfer. The controller carries UL, ATEX Zone 2, and marine (ABS, BV, DNV GL) certifications.