Description
Hard-Numbers: Technical
- Model: IS420ESWBH3A (corrected from IS420EWSBH3A)
- Alt. P/N: ESWBH3A
- Product Series: Speedtronic Mark VIe / Mark VIeS
- Hardware Type: Unmanaged industrial IONet Ethernet switch
- Key Feature: 16× 10/100Base‑TX copper ports, no fiber interfaces
- Primary Field Use: High‑density local I/O networking in short‑haul control cabinet loops
IS420ESWBH3A
Specifications
- Protocol Support: IEEE 802.3, 802.3u, 802.3x, Auto‑MDIX
- Copper Ports: 16× RJ45, 10/100 Mbps auto‑negotiating
- Fiber Ports: 0
- MAC Table Size: 4096 entries
- Packet Buffer: 256 KB
- Operating Temperature: -40°C to +70°C
- Isolation Rating: 1500 Vrms port‑to‑backplane
- Power Input: 24–28 VDC dual redundant
- Power Draw: 8 W typical, 10 W maximum
- Environmental Rating: Class I Div 2, Zone 2, G3 conformal coating
The Real-World Problem It Solves
Remote I/O racks often suffer from port shortages and unnecessary fiber complexity in local cabinet runs. This 16‑port copper‑only switch eliminates daisy‑chain latency and removes unneeded fiber failure points in tight enclosures.
Where you’ll typically find it:
- Local I/O panels in gas and steam turbine Mark VIe systems
- Cogeneration units in refineries with short copper IONet runs
- Offshore utility modules with no long‑distance fiber uplink needs
Bottom line: It consolidates local I/O connections in a compact, vibration‑tolerant package.
Hardware Architecture & Under-the-Hood Logic
This is an unmanaged Layer 2 switch with hardware‑only packet forwarding, no onboard CPU or firmware dependency. All ports are electrically isolated and convection‑cooled with no moving parts.
- Ingests Ethernet frames from controllers and I/O modules.
- Performs MAC address lookup in hardware for low‑latency forwarding.
- Applies flow control to prevent buffer overflow during traffic spikes.
- Auto‑negotiates speed and duplex on each copper port.
- Signals link status and activity via front‑panel LEDs.
IS420ESWBH3A
Field Service Pitfalls: What Rookies Get Wrong
Redundant Power MiswiringTechs commonly tie both 24VDC inputs to the same power supply. This removes redundancy and causes full switch failure if that supply drops.
- Field Rule: Feed each power terminal from separate, isolated 24VDC sources.
Unused Port Broadcast StormsLeaving open RJ45 ports active allows broadcast noise to flood the IONet and spike control latency.
- Quick Fix: Disable all unused ports through ToolboxST or DIP switch configuration.
Cabinet Airflow BlockageMounting the switch too close to backplates or other modules chokes convection cooling. Overheating leads to intermittent link drops.
- Field Rule: Maintain 50 mm of clearance above and below the unit for airflow.
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.
