Description
Hard-Numbers: Technical Specifications
- Standards: IEEE 802.3, 802.3u, 802.3x, HP-MDIX
- Copper Ports: 16× RJ45, 10/100 Mbps, auto-negotiation, full/half duplex
- Fiber Ports: 0
- Buffer Memory: 256 KB
- MAC Table: 4K addresses
- Switching Capacity: 3.2 Gbps
- Operating Temp: -40°C to +70°C
- Power Input: 24–28 VDC (dual redundant, diode-OR’d)
- Power Draw: 8 W typical, 10 W max
- Isolation: 1500 Vrms port-to-backplane
- Cooling: Convection (no fan)
- Mounting: DIN-rail (BVP1/BVP4 clips) or panel-mount
- Dimensions: 138 × 86 × 56 mm
- Weight: 0.91 kg (2 lbs)
- Environmental: G3 conformal coating, Class 1 Div 2 / Zone 2 hazardous location rated
- Indicators: Link (green=100M, yellow=10M), Activity, Duplex, Power

IS420ESWBH3A
The Real-World Problem It Solves
Local I/O panels need maximum copper ports for nearby modules with no long-distance fiber requirement. This unit provides 16 copper ports in a compact, rugged form factor—ideal for dense local I/O networks where fiber uplinks are unnecessary.
Typical Applications:
- Local I/O racks in gas/steam turbine control rooms
- Compact control panels with short Cat5e/Cat6 cable runs
- Safety systems (Mark VIeS) requiring copper-only IONet segments
Hardware Architecture & Under-the-Hood Logic
Unmanaged Layer 2 switch with hardware-based forwarding (no CPU/firmware). Full isolation between ports. Designed for real-time control traffic.
- Frames ingested from 16 copper ports.
- Hardware MAC address lookup forwards packets with <1 ms latency.
- 802.3x flow control prevents buffer overflow.
- Auto-negotiates speed/duplex; auto-crossover (HP-MDIX).
- LEDs clearly indicate link speed, activity, and power status.
Field Service Pitfalls: What Rookies Get Wrong
Overheating in Enclosed CabinetsRookies mount switches in sealed cabinets with no ventilation. Convection cooling fails → overheating → link drops.
- Field Rule: Ensure 50 mm clearance above/below for airflow.
Unused Port StormsLeaving unused RJ45 ports active creates broadcast storms that spike IONet latency.
- Quick Fix: Disable unused ports via ToolboxST or DIP switches; enable storm filtering.
Redundant Power MiswiringConnecting both power inputs to the same supply eliminates redundancy.
- Field Rule: Feed TB1 and TB2 from separate 24 VDC sources for true redundancy.

IS420ESWBH3A
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.


