Description
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3. Product Introduction (Anti-Template)
Mark VIe and Mark VIeS systems require dedicated industrial Ethernet switches that meet the timing and reliability demands of IONet. The IS420ESWBH2A is the ESWB-family unmanaged switch configured with 16 copper ports and two 100Base-FX multi-mode fiber uplinks.
It is specifically designed for real-time industrial control traffic, supports redundant power inputs, and carries hazardous-location ratings suitable for power generation environments. Plants standardized on Mark VIe keep this switch available because loss of an IONet switch isolates controllers and I/O packs until a compatible replacement is installed and links are restored.
IS420ESWBH2A
IS420ESWBH2A
IS420ESWBH2A
IS420ESWBH2A
IS420ESWBH2A
4. Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | IS420ESWBH2A |
| Description | Unmanaged Industrial Ethernet / IONet Switch |
| System Compatibility | GE Mark VIe and Mark VIeS |
| Copper Ports | 16 × 10/100Base-TX (RJ-45), auto-negotiation |
| Fiber Ports | 2 × 100Base-FX multi-mode (LC connectors) |
| Standards | IEEE 802.3, 802.3u, 802.3x |
| Power Requirements | 24 / 28 VDC, 1 A max; dual redundant inputs (Diode-OR’d) |
| Operating Temperature | –40 °C to +70 °C |
| Hazardous Location | Class 1 Div 2 / Class 2 Zone 2 / ATEX |
| Dimensions (H × W × D) | Approx. 18.8 × 8.6 × 5.6 cm |
| Mounting | DIN-rail (with qualified clip) |
5. Field Application & Technical Pitfalls (The Engineer’s Guide)
This switch is used to form the IONet backbone that interconnects Mark VIe controllers, I/O packs, and related devices. The dual fiber ports allow longer-distance or noise-immune uplinks while the 16 copper ports serve local drops.
Three pitfalls appear during replacement:
Fiber type and connector match – the H2A version specifically uses multi-mode LC fiber; installing single-mode fiber or incorrect connectors will result in no link.
Power redundancy – both power inputs should be connected for full redundancy; a single supply leaves the switch vulnerable to power loss.
Cable quality and length – marginal copper cables or excessive length can cause intermittent link or high error rates that only appear under load.
One plant replaced an ESWB switch and saw intermittent fiber link alarms. The new switch was healthy; the existing multi-mode patch cables had been mixed with single-mode jumpers during a previous outage. Correcting the fiber type restored stable links.
6. Quality Control (QC) SOP & Transparency
- Inbound Verification – OEM labeling, full part number (IS420ESWBH2A), and date codes are photographed and checked against the packing list; any signs of prior field use are noted.
- Live Rig Testing – switch is powered from a known-good 24 VDC supply and verified for successful power-up and status LED behavior on copper and fiber ports.
- Parameter Testing – link establishment on representative copper and fiber ports is confirmed where test equipment is available.
- Final QA & Packaging – unit is sealed in an anti-static bag with desiccant, fitted with a QC-passed label showing test date and technician ID, then double-boxed for shipment.
7. Frequently Asked Questions (FAQ)
What is the IS420ESWBH2A?
It is an unmanaged industrial Ethernet / IONet switch used in GE Mark VIe and Mark VIeS control systems.
How many ports does it have?
16 copper 10/100Base-TX RJ-45 ports and 2 multi-mode 100Base-FX fiber ports with LC connectors.
Does it support redundant power?
Yes. It has dual power inputs that are Diode-OR’d for redundancy.
What is the operating temperature range?
–40 °C to +70 °C.
What warranty comes with a new-surplus unit?
Twelve months from shipment against defects in materials and workmanship when installed within the published ratings.
How do I confirm the switch is healthy after installation?
Apply power, verify the power LED is on, confirm link LEDs illuminate on connected ports, and check that IONet communications between controllers and I/O packs operate without new network-related alarms.
