Description
Honeywell SC-UCMX02 51307198-276 | ControlEdge RTU2020 Non-Redundant Controller
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | SC- |
| Part Number | 51307198-276 |
| Platform | ControlEdge 2020 / ControlEdge RTU |
| Controller Type | Non-redundant |
| Processor | Dual-core ARM Cortex-A9, 32-bit, 667 MHz |
| DRAM | 256 MB |
| Program Flash | 256 MB |
| Nonvolatile Memory | 4 Mbits |
| Onboard I/O | 28 mixed I/O channels |
| Analog Inputs | 8, 4–20 mA or 1–5 VDC, software configurable |
| Analog Outputs | 2, 4–20 mA source |
| Digital Inputs | 10, 24 VDC external supply |
| Digital Outputs | 6, sink type, 24 VDC, up to 80 mA/channel |
| Pulse Inputs | 2, configurable as pulse or digital inputs |
| Pulse Frequency | 0–10 kHz |
| Ethernet | 2 × 10/100Base-TX on non-redundant controller |
| Serial | 2 × RS-232 + 2 × RS-485 |
| SD Card | Up to 32 GB, Class 6/Class 10 |
| Supply Voltage | 24 VDC nominal, 18–30 VDC operating |
| Max. Input Current | 1.20 A at 30 VDC with controller plus 9 I/O modules |
| Power Consumption | 1.7 W minimum; 2.9 W maximum without expansion I/O; 3.4 W maximum with expansion I/O |
| Operating Temperature | -40 to +75°C |
| Storage Temperature | -40 to +85°C |
| Humidity | 5–95% RH, non-condensing |
| Mounting | DIN rail, TH35-7.5 |
| Dimensions | 190 × 99 × 141 mm |
| Weight | 700 g |
| Programming | IEC 61131-3 environment |
| Communication | Modbus, DNP3, HART-IP, MQTT, IEC 60870 and other supported services |
| Security | ISASecure / IEC 62443 Security Level 2 for specified firmware generation |
Honeywell specifies the non-redundant SC- with two Ethernet ports, two RS-232 ports and two RS-485 ports. Ethernet supports 10/100Base-TX, while the serial interfaces support standard rates from 300 to 115200 baud.
The 28-channel onboard I/O consists of 8 analog inputs, 2 analog outputs, 10 digital inputs and 6 digital outputs, with two additional high-speed pulse inputs that can also be configured as digital inputs. The analog inputs support HART, while the controller architecture provides access to HART-IP for remote instrument management.
Product Introduction
The Honeywell SC- 51307198-276 is a non-redundant controller for the ControlEdge 2020 RTU platform, combining the control processor, onboard mixed I/O and controller communications in one compact assembly. Honeywell identifies the SC- specifically as a non-redundant controller with 28 mixed onboard I/O and 256 MB DRAM, making it suitable for remote process control, telemetry and distributed SCADA installations where a separate controller plus local I/O rack would add unnecessary hardware.
The Honeywell SC- 51307198-276 uses a 667 MHz dual-core ARM Cortex-A9 processor and supports IEC 61131-3 programming, datalogging, Modbus, DNP3, MQTT, IEC 60870 and HART-IP functions. Its low controller power requirement and -40 to +75°C operating specification are particularly relevant to remote stations, pipeline facilities and other sites where cabinet space and available power are limited.
SC-UCMX02
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
A common problem with remote RTU installations is that the controller itself is still functional while one of the mixed-I/O or communication sections becomes unreliable. Replacing the entire architecture simply because an installed controller is unavailable can create unnecessary engineering work, especially when the site configuration, SCADA database and field wiring have already been validated. The SC- 51307198-276 is useful in this situation because its controller and onboard I/O architecture is designed specifically around the ControlEdge 2020 platform.
Typical Applications
- Oil and gas remote stations — wellhead monitoring, pipeline valve stations, compressor stations and pump facilities.
- Water and wastewater — remote pumping stations, reservoir monitoring and distributed treatment equipment.
- Power and utility sites — unmanned substations and auxiliary process monitoring where RTU telemetry is required.
- Remote process automation — local PID, sequencing, data logging and SCADA communication at geographically dispersed facilities.
The controller can also connect to additional ControlEdge 2020 expansion I/O. Honeywell specifies up to 30 expansion I/O modules arranged across five rows, with up to nine modules per row.
Technical Pitfalls to Avoid
1. Do not confuse SC- with SC-UMIX01.
They are related, but they are not the same product. Honeywell lists SC- as the complete non-redundant controller with onboard I/O, while SC-UMIX01 is the 28-channel expansion mixed-I/O module. The controller includes the CPM and its corresponding IOTA; the I/O module is a different assembly.
2. Verify the firmware release before replacement.
SC- hardware was introduced with enhanced memory and security capabilities, and Honeywell documents security certification against specific firmware generations. A mechanically compatible spare is not automatically a configuration-compatible spare. Check the running RTU release, application backup and installed licenses before putting the replacement into service.
3. Do not assume every communication protocol is available without configuration or licensing.
The platform supports a broad protocol set, but some functions have specific software requirements. For example, Honeywell documents an HART Protocol Enabler license for each I/O module where digital HART access is required.
4. Check the actual I/O wiring before commissioning.
The analog inputs are single-ended and non-isolated. Digital inputs also use external 24 VDC and are not isolated. This matters when replacing an older RTU in a field cabinet with ground-potential differences or long cable runs.
5. Power-supply calculations should include field instruments.
Honeywell’s published 1.7–3.4 W controller figures exclude the consumption of connected transmitters, valves and other instruments. Do not use the controller’s low nominal power figure as the complete cabinet power budget.
6. Check the exact part number, not just “SC-.”
The requested 51307198-276 identifies a specific ordering configuration. Some secondary listings also associate 51307198-175 with SC-, but revision and firmware compatibility should be checked against the installed system rather than assuming the suffixes are interchangeable.
7. Environmental approval is installation-dependent.
Honeywell specifies -40 to +75°C for ControlEdge 2020 hardware and lists hazardous-location approvals including Class I Division 2 and ATEX/IECEx classifications. Actual field installation still has to comply with the applicable certification, enclosure, wiring and installation requirements.
Related Products
- SC-UCNN11 — ControlEdge 2020 redundant controller; use where controller redundancy is required rather than the non-redundant SC-.
- SC-UMIX01 — 28-channel mixed I/O expansion module; complements a controller when additional field points are needed.
- SC-TEPR01 — right expansion end plate for ControlEdge 2020 I/O rows.
- SC-TEPL01 — left expansion end plate used when additional I/O rows are configured.
- CC-PFB402 — Series C Foundation Fieldbus Interface Module with four H1 links for ControlEdge RTU applications.
- CC-TFB402 — corresponding coated IOTA for the Series C FIM4 interface.
- SP-IHARTP — HART Protocol Enabler license required where digital HART access is needed on applicable I/O modules.
- SP-IWIO01 — wireless I/O license for controller installations using supported ISA100 devices.
- SP-MRUN01 — Meter Run license for electronic flow metering applications.
- ControlEdge Builder — engineering/configuration environment used for ControlEdge RTU application development and configuration.
Procurement Note
For a Honeywell SC- 51307198-276 replacement, the critical checks are the complete part number, controller hardware revision, firmware release, application backup, installed licenses, I/O configuration and communication topology. If the existing unit is being replaced in a live brownfield RTU, confirm these items before shipment rather than treating the part number alone as sufficient compatibility information.
For surplus or previously installed inventory, request clear photographs of the nameplate and connectors and confirm whether the quoted unit is the complete CPM/IOTA controller assembly or only the processor hardware. Honeywell’s own documentation defines SC- as the complete non-redundant controller model, including the CPM and IOTA.
