Honeywell RTU2020 Remote Terminal Unit Modular RTU

Honeywell RTU2020 is a modular Remote Terminal Unit (RTU) designed for process industries such as oil & gas, mining, etc. Its key features include low power consumption (typically only 1.8W), onboard 28 mixed I/O channels all with built-in HART protocol, and support for a wide operating temperature range of -40°C to 75°C.

Core Models and Component List

The RTU2020 uses a modular design. A complete system typically consists of the following components:

1. Core Controller

This is the "brain" of the system, responsible for logic execution and data processing. Some models also integrate I/O points.

Model Description / Key Parameters Typical Use

SC-UCMX01 (51307198-175) 28 mixed I/O points (8AI, 2AO, 10DI, 6DO, 2 pulse)

Dual-core 667MHz processor, supports HART protocol Standard main control unit

SC-UCMX02 Functionally similar to UCMX01, with possible slight configuration differences Standard main control unit

2. Expansion I/O Modules

Used to expand channel capacity when the controller's onboard I/O points are insufficient.

Model Description / Key Parameters Typical Use

SC-UCNN11 Expansion I/O module, requires IOTA backplane Increase I/O channels

SC-UMIX01 (51307550-175) 28-point mixed I/O module, HART-enabled, requires IOTA backplane Increase I/O channels

3. Backplanes and Accessories

Basic components used to mount modules and provide field wiring terminals.

Model Description / Key Parameters Typical Use

SC-TEPR01 IOTA backplane, right-side terminal block Mount CPM/IOM modules

SC-TEPL01 IOTA backplane, left-side terminal block Mount CPM/IOM modules

SP-EMD150/151/160 Power supply module, provides power to the RTU system System power supply

4. Software and Feature Options

These are software licenses or special function modules for advanced capabilities.

Model Description / Key Parameters Typical Use

SP-MCALC1 Flow calculation license Gas/liquid flow metering

SP-IHARTP HART protocol support license Enable HART communication

SP-IWIO01 Wireless I/O integration license Integrate ISA100 wireless devices

Hardware Architecture Description

Understanding the hardware architecture of the RTU2020 is very helpful for system selection and field maintenance. It mainly consists of the following parts:

CPM (Control Processor Module): The core controller such as the SC-UCMX01, which executes control logic and handles communication.

IOM (Input/Output Module): Expansion I/O modules such as the SC-UCNN11.

IOTA (Input/Output Terminal Assembly): The passive backplane (e.g., SC-TEPR01/TEPL01) used to mount CPM/IOM modules and provide field wiring terminals.

Selection and Application Recommendations

When selecting components for a project, consider the following points:

Small-scale applications: If the number of field I/O points is small, a single SC-UCMX01/02 with onboard I/O is usually sufficient.

Flow calculation required: If the application involves natural gas or petroleum metering, you need to purchase the SP-MCALC1 software license separately.

Larger scale: When more I/O points are needed, you can expand using I/O modules such as the SC-UCNN11, supporting up to 128 channels.