Description
Hard-Numbers: Technical Specifications
- Protocol Support: Modbus RTU, IONet 100Mbps Ethernet
- Port Count: 2× RJ45 Ethernet; 6× configurable serial (DC-62)
- Serial Standards: RS-232, RS-422, RS-485 half-duplex
- Baud Rates: 300–115200 baud (software configurable)
- Isolation Rating: 2500 VAC RMS (field-to-backplane)
- Power Requirements: 24 VDC (22.5–28.6V), 8.5W max
- Operating Temperature: -40°C to +70°C
- Weight: ~0.8 kg
- Dimensions: 110 × 62 × 20 mm
- Certifications: UL, CSA, CE; Class I Div 2, Zone 2
IS220PDIOH1A
The Real-World Problem It Solves
Legacy 4–20mA and serial devices lack direct Ethernet integration. Gateways add latency, single points of failure, and extra cabinet space.Where you’ll typically find it:
- Turbine control to Modbus flow meters and analyzers
- Power generation SCADA link to legacy PLCs and HMI
- Offshore/Refinery serial RS-485 sensor networksBottom line: integrates serial assets directly into Mark VIe without external gateways.
Hardware Architecture & Under-the-Hood Logic
runs on a dedicated BPPB processor with isolated transceivers. It handles all serial framing and Modbus processing locally.
- Serial signals terminate at DC-62 field connector
- Each channel isolated to 2500V to block ground loops
- On-board MCU converts serial/Modbus to IONet packets
- Dual RJ45 ports for redundant IONet communication
- IR diagnostic port for local tool access
- Internal watchdog monitors processor and communication health
Field Service Pitfalls: What Rookies Get Wrong
RS-485 Bias & Termination MissingRookies skip 120Ω termination or fail to add bias resistors. Bus floats; garbled data or intermittent dropouts occur.
- Field Rule: Terminate bus at endpoints only. Add 1kΩ pull-up/pull-down bias on master port.Improper RS-232 Cable LengthUsing RS-232 over 50ft (15m) causes signal degradation. Data errors and communication timeouts follow.
- Quick Fix: Use RS-422/485 for runs >15m. Keep RS-232 cables short and shielded.Mixed Ground Potentials (No Isolation)Connecting remote devices with different ground references. Common-mode voltage destroys transceivers.
- Field Rule: Use isolated ports for cross-cabinet runs. Never tie field grounds to backplane.
IS220PDIOH1A
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.
