Description
Hard-Numbers: Technical Specifications
- Communication Protocol: ABB Advant COMLI, TCP/IP over Ethernet
- Data Rate: 100Mbps Fast Ethernet
- Fiber Interface: ST connector (straight tip), multi-mode fiber
- Fiber Wavelength: 850nm (multi-mode)
- Maximum Fiber Length: 2000 meters (multi-mode, 62.5/125µm)
- Redundancy Mode: Hot standby with automatic failover (<10ms detection)
- Isolation Voltage: 1000V AC
- Power Supply: 5V DC (backplane powered)
- Power Draw: 4W nominal
- Operating Temperature: -20°C to +60°C
- Storage Temperature: -40°C to +85°C
- Humidity Range: 5% to 95% (non-condensing)
- DIN Rail Mounting: Slides into AC800M CPU rack (module slot)
- Dimensions: 159mm × 60mm × 125mm (H × W × D)
- Status Indicators: Port A/B status, Link, Activity, Fault LEDs
ABB NOCR-01C 64300245
The Real-World Problem It Solves
Running copper Ethernet between controllers in high-voltage environments is asking for ground loops and EMI-induced communication dropouts every time a VFD fires. The NOCR-01C gives you optical isolation and 2-kilometer reach with automatic redundancy—when one fiber path gets cut or the transceiver fails, the backup takes over without your process even noticing.
Where you’ll typically find it:
- Power plant boiler control rooms linking redundant AC800M controllers across different cabinets
- Oil and gas offshore platform networks requiring intrinsically safe communication between hazardous and safe zones
- Steel mill drive control systems where heavy motor interference kills copper Ethernet links
This module keeps your redundant controllers talking when EMI, distance, or physical damage takes out one path.
Hardware Architecture & Under-the-Hood Logic
The NOCR-01C plugs directly into the AC800M controller backplane, providing two independent optical transceiver channels managed by an onboard microprocessor. The module operates as a bridge between the controller’s internal bus and external fiber networks, with failover logic running continuously in hardware.
Internal Signal Flow:
- Data arrives from the AC800M controller via the backplane VME64 bus
- Microprocessor buffers incoming packets and manages redundancy state machine
- Active port transceiver converts electrical signals to optical (850nm TX)
- Optical signals transmit over multi-mode fiber to connected device
- Incoming optical signals are received and converted back to electrical
- Received packets are buffered and forwarded to the controller via backplane
- Watchdog circuit monitors both ports; loss of signal triggers automatic failover to backup port
- Fault status is reported to controller’s diagnostic buffer and indicated via front-panel LEDs
ABB NOCR-01C 64300245
Field Service Pitfalls: What Rookies Get Wrong
Mix Up Single-Mode and Multi-Mode Fiber
I’ve seen techs pull single-mode fiber because “that’s what IT gave me” and wonder why the link never comes up. The NOCR-01C is multi-mode only—850nm transceivers won’t couple light into single-mode fiber properly. You get zero link even with perfect cable.
Field Rule: Check your fiber cable jacket—62.5/125µm OM1 or 50/125µm OM3/OM4 multi-mode only. If you see “9/125” on the jacket, that’s single-mode and it won’t work. Period.
Don’t Clean the ST Connectors Before Mating
Dirty fiber connectors cause intermittent dropouts that drive you crazy—link comes up, goes down five minutes later, comes back. Techs blame the module or the cable when it’s just dust or oil on the ferrule. The optical port on the NOCR-01C doesn’t self-clean like copper jacks.
Quick Fix: Use a fiber optic cleaning pen or 99% isopropyl alcohol with lint-free wipes before every connection. Inspect the ferrule under a pocket microscope if you have one—if it looks cloudy, clean it. This single habit eliminates 80% of fiber link problems.
Ignore the Redundancy Timeout Setting
The default failover timeout is 10 seconds, which is fine for most applications. But in high-speed processes like paper machine headbox control or turbine governor sync, 10 seconds is an eternity. Your primary path dies and your secondary takes too long to cut in—the process trips before failover completes.
Quick Fix: Tune the redundancy detection timeout in the AC800M project configuration. Drop it to 3-5 seconds for high-speed processes, but don’t go below 2 seconds or you risk nuisance failover from temporary fiber signal loss. Find the sweet spot for your application.
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
