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Frequently inquire Together
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InquiryEmerson 396879-01-2 Central Processing Unit
The Emerson 396879-01-2, also cataloged as the 396879 CPU Module, serves as the primary processing unit for Emerson ControlWave and Bristol Babcock RTU architectures, executing system logic and communication tasks in distributed automation environments.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 396879-01-2 |
| Brand | Emerson |
| Origin | U.S.A |
| Weight | Not specified |
| Dimensions | Rack-mounted CPU module |
| Operating Temp | -40 deg C to +85 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Relative Humidity | Up to 95% RH, non-condensing |
| Processor | Sharp LH7A400 SoC, ARM9TDMI 32-bit RISC core |
| Clock Frequency | 33 MHz or 150 MHz system clock |
| Core Voltage | 1.8 V internal |
| SRAM | 2 MB with battery backup |
| SDRAM | 64 MB synchronous dynamic RAM |
| System Flash | 512 KB boot/loader flash |
| Application Flash | 16 MB read/write flash |
| Ethernet Port | 1 × 10/100 Base-T RJ45 |
| Serial Ports | 2 × RS-232, 1 × RS-485 isolated |
| Status Indicators | TX/RX LEDs per communication port |
| Power Supply Input | +12 VDC nominal (10.7–30 VDC), +24 VDC nominal (21.7–30 VDC) via PSSM module |
Profinet / EtherNet/IP Deterministic Networks
The 396879-01-2 CPU integrates with deterministic Ethernet networks, supporting real-time communication across distributed RTU and SCADA systems. Its ARM9TDMI core ensures predictable execution cycles, while firmware flash compatibility allows seamless upgrades without disrupting backplane communication velocity. This architecture supports I/O density scaling across multiple subsystems.
Frequently Asked Questions (FAQ)
Q: Can the CPU operate in extreme outdoor RTU environments? A: Yes. It is rated for -40 deg C to +85 deg C, suitable for harsh industrial sites.
Q: How is nonvolatile memory protected? A: SRAM is battery-backed, while flash memory provides long-term retention without battery support.
Q: Are firmware upgrades supported? A: Yes. Application flash supports simultaneous read/write operations, enabling in-field firmware updates.
Field Installation Guidelines
- Install the CPU module in designated rack slots with full connector engagement.
- Ensure Ethernet cabling is shielded and routed separately from high-voltage conductors.
- Verify DC supply voltage range before energizing; connect via PSSM power supply module.
- Ground chassis to cabinet earth to reduce induced noise.
- Confirm TX/RX LED indicators during commissioning to validate communication ports.
- Maintain environmental conditions within specified operating and storage ranges.
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