Description
Product Overview
The 8851-LC-MT is the core safety controller for GE MOST SafetyNet safety system. It executes safety application logic, manages Railbus local I/O communication, Ethernet peer-to-peer networking and serial device links. This controller can run in redundant master/standby mode with bumpless transfer, built for SIL 2 safety interlock, emergency trip and protection control in power, oil & gas and critical industrial plants.
Technical Specifications
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| Item | Parameter |
|---|---|
| Manufacturer | General Electric (GE) |
| Part Number | 8851-LC-MT |
| Product Type | SafetyNet Controller |
| Safety Level | IEC 61508 SIL 2 certified |
| I/O Support | Controls up to 64 SafetyNet I/O modules |
| Network | Dual redundant high-speed Ethernet; internal Railbus for local node I/O |
| Processor | 32-bit RISC CPU with flash and RAM memory |
| Event Logging | Up to 8000 event records for diagnostic and audit trail |
| Power Supply | 12 VDC |
| Architecture | 1oo1D with comprehensive internal diagnostics |
| Mounting | Carrier rack mount |
Key Features
- SIL 2 Safety Certification: Complies with IEC 61508 for safety-critical protection functions.
- Redundant Operation: Supports master/standby redundancy with bumpless switchover to avoid safety system interruption.
- Multi-path Communication: Railbus for local I/O modules, Ethernet for peer controllers, HMI and workbench programming; serial ports for remote field devices.
- Online Configuration: Permits online reconfiguration without shutting down the safety system.
- Built-in Diagnostics: Continuous self-testing of hardware, communication and logic execution, with event logging for fault troubleshooting.
- Hot-swap compatible: Designed for modular rack installation, supports hot replacement of modules.
Applications
- Power plant safety interlock and turbine protection
- Oil & gas emergency shutdown (ESD) systems
- Critical process safety control for industrial manufacturing
- Nuclear auxiliary safety control systems
Installation & Maintenance Notes
- Install in dedicated SafetyNet controller carrier rack.
- Configure and download safety program via SafetyNet Workbench software.
- Periodically check diagnostic status and event logs to identify latent faults.
- Verify redundancy switchover function during scheduled outages.
FAQ
Q: What system does 8851-LC-MT belong to? A: It is the main controller of GE MOST SafetyNet safety system, paired with SafetyNet I/O modules such as 8810-HI-TX and 8811-IO-DC.
Q: Is this suitable for SIL3 application? A: No, it is certified for SIL2 safety functions only.
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