Description
Hard-Numbers: Technical Specifications
- Network Interface 1: Ethernet/IP (RJ45, 10/100Mbps)
- Network Interface 2: PROFIBUS DP Master (DB-9, 9-pin D-sub connector)
- PROFIBUS DP Data Rate: 9.6 kbps to 12 Mbps (auto-detect)
- Ethernet/IP Protocol Support: CIP Industrial Protocol, Class 1/3 connections
- PROFIBUS DP Slave Support: Up to 124 DP slaves per gateway
- Isolation Voltage: 1500V AC between networks
- Power Supply: 24V DC (18-36V range)
- Power Draw: 3.5W nominal
- Operating Temperature: -40°C to +70°C
- Storage Temperature: -40°C to +85°C
- Humidity Range: 5% to 95% (non-condensing)
- DIN Rail Mounting: 35mm standard rail
- Dimensions: 125mm × 110mm × 80mm (H × W × D)
- Certifications: CE, UL, ATEX Zone 2
ABB NE870
The Real-World Problem It Solves
Your facility still runs hundreds of PROFIBUS DP drives and IO because replacing the entire field infrastructure costs more than your annual budget. The NE870 lets you integrate these legacy assets into a modern Ethernet/IP control system without ripping out field cabling—no “forklift upgrade” required.
Where you’ll typically find it:
- Steel mill roll stand modernizations where AC drives communicate over PROFIBUS DP
- Water treatment plants connecting legacy sensors to new SCADA networks
- Chemical plant retrofits preserving hazardous-area certified field equipment
This gateway buys you time for a phased migration instead of a weekend shutdown overhaul.
Hardware Architecture & Under-the-Hood Logic
The NE870 sits between your Ethernet/IP controller network and the PROFIBUS DP fieldbus, acting as a bidirectional protocol translator. Each side has its own dedicated microprocessor and memory buffer, ensuring protocol timing independence.
Internal Signal Flow:
- Ethernet/IP packets arrive at the RJ45 port and are processed by the network stack
- CIP data payloads are extracted and mapped to internal dual-port RAM
- PROFIBUS DP master controller reads data from RAM and constructs PROFIBUS telegrams
- Data is transmitted over DB-9 to DP slaves according to configured parameterization
- DP slave responses are received and written back to dual-port RAM
- Ethernet/IP side polls the RAM and constructs response packets back to the controller
- Watchdog timers monitor both networks; faults trigger alarm states if communication fails
ABB NE870
Field Service Pitfalls: What Rookies Get Wrong
Mix Up the Network Terminators
Young techs throw resistors on both ends “just to be safe” and wonder why the bus won’t poll. PROFIBUS DP requires a terminator only at each end of the bus segment—one on the gateway itself, another at the furthest slave. Install them in the middle and you kill signal integrity.
Field Rule: One 120Ω terminator at the gateway’s DB-9 (switch ON), one at the end slave. If you have more than 32 devices or segment length exceeds 1200 meters, you need repeaters and fresh terminators for each segment.
Ignore the Address Gap in Your GSD File
The NE870 maps I/O data contiguously, but many techs configure the PROFIBUS address map with gaps or holes from deleted devices. The gateway still polls these empty addresses, wasting bandwidth and causing cyclic latency that makes your drives trip on timeout faults.
Quick Fix: Use the GSD editor to compact your address map after removing legacy slaves. Re-deploy the configuration to the gateway and verify you’re not polling non-existent devices—your cycle time drops by 20-30% immediately.
Forget to Check Ethernet/IP Connection Class
Most techs set up Class 3 (messaging) connections because they’re easier to configure in the controller software. But for cyclic I/O data transfer to PROFIBUS devices, you need Class 1 (implicit) connections. You end up with a “connected” gateway but zero data flow to your field devices.
Quick Fix: Verify your Ethernet/IP EDS file is configured for Class 1 input/output connections. Check the assembly instances match your controller’s I/O map—if the connection type is wrong, you’ll get green lights but no data movement.
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.
