Description
Hard-Numbers: Technical Specifications
- Serial Channels: 6 × isolated, software-configurable
- Protocols: RS-232, RS-422, RS-485 (half-duplex), Modbus Master
- Ethernet Ports: 2 × 100 Mbps IONet (RJ45)
- Max Baud Rate: 375 kbps (RS-422/485), 19.2 kbps (RS-232)
- Isolation Rating: 2500 Vrms field-to-backplane
- Power Input: 22.5–28.6 VDC redundant
- Power Draw: 8.6 W (0.36 A @ 24 VDC)
- Operating Temp: -40°C to +70°C (-40°F to +158°F)
- Environmental: Class I Div 2, Zone 2, G3 conformal coating
- Firmware: ControlST v4.07 or newer required
- Dimensions: 8.26 × 4.19 × 12.1 cm (H×W×D)
IS420ESWBH3A
The Real-World Problem It Solves
Legacy plant assets (flow meters, motor drives, RTUs) rely on serial protocols and can’t natively speak Ethernet. This module translates serial data to IONet, eliminating the need for external gateways and simplifying cabinet integration.
Where you’ll typically find it:
- Power plant boiler controls with Modbus RTU transmitters
- Refinery tank farms with RS-485 based level gauges
- Offshore compressor skids with legacy RS-232 PLCs
Bottom line: It unites old serial devices with the Mark VIe control network without custom wiring.
Hardware Architecture & Under-the-Hood Logic
Built around a dedicated BPPC processor with isolated serial transceivers. No shared logic with the main controller; all protocol conversion runs locally on-board.
- Serial frames from field devices are captured and electrically isolated.
- On-board ASIC validates checksums and filters noise.
- BPPC processor converts serial data to Ethernet Modbus/IONet packets.
- Dual redundant IONet ports send data to Mark VIe controllers.
- Front-panel LEDs indicate link, activity, and fault states per channel.
IS420ESWBH3A
Field Service Pitfalls: What Rookies Get Wrong
Baud Rate Mismatch (Silent Failures)Rookies set port speeds to match the device label but ignore line noise. Mismatched or unstable baud rates cause partial data loss and intermittent timeouts.
- Field Rule: Lock baud rate to 19.2 kbps for RS-232; max 375 kbps for RS-485/422. Use twisted-pair shielded cable.
Incorrect RS-485 TerminationSkipping termination resistors or adding too many causes signal reflections. Results in garbled data and random device dropouts on long runs.
- Quick Fix: Install one 120 Ω resistor at the last device on the RS-485 bus.
Ground Loop Isolation FailureConnecting field-side grounds to cabinet earth creates circulating currents. Destroys transceivers and corrupts all serial communication.
- Field Rule: Leave field-side grounds floating. Rely on module’s 2500 Vrms isolation.
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.
