Emerson ROC800 Hardware Overview — Modules, I/O, and Power
Key Takeaway
Complete hardware reference for the Emerson ROC800 — CPU module, I/O expansion, communication ports, power options, and environmental ratings.
Quick Answer
The Emerson ROC800 is a modular flow computer built around a CPU module in an expandable chassis accepting analog, digital, pulse, and temperature I/O modules plus Ethernet and serial communication cards. Fully populated, it supports 100+ I/O points. The multi-variable module combining DP, SP, and temperature in one slot is a practical advantage over ABB Totalflow and SCADAPack at tight orifice meter installations.
What I/O Modules Are Available?
- Analog input (4-20mA, voltage, internal transducer)
- Multi-variable (DP + SP + temperature in one slot)
- Analog output (4-20mA)
- Digital input/output (relay, transistor)
- Pulse/frequency input (turbine meters)
- RTD/thermocouple temperature modules
What Communication Options Are Available?
- Onboard RS-232 (F-port front, R-port rear)
- RS-485 serial for multi-drop
- Ethernet module (ROC protocol port 4000, Modbus TCP port 5000, DNP3/TCP port 20000)
- Radio and cellular modem interface ports
How Is It Powered?
12/24VDC, solar-compatible, internal battery backup. Operating range -40°C to +70°C. Class I Division 2 hazardous area certified.
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Frequently Asked Questions
Over 100 with a fully populated chassis. Base CPU has limited onboard I/O; additional points via plug-in modules.
Via optional Ethernet module supporting ROC protocol (port 4000), Modbus TCP (port 5000), and DNP3/TCP (port 20000) simultaneously.
-40°C to +70°C, suitable for outdoor pipeline and wellsite installations.
Still have questions about your setup? Talk to an engineer or call (210) 405-4248.