Description
Hard-Numbers: Technical Specifications
- Protocol Support: IONet (100Mbps), HART 5/6/7
- Port Count: 2× RJ45 Ethernet, 1× DC-37 field connector
- Analog Inputs: 12× 4–20mA, 16-bit ADC, HART compliant
- Analog Outputs: 12× 4–20mA, 14-bit DAC, HART compliant
- Isolation Rating: 2500 VAC RMS field-to-backplane
- Power Requirements: 24 VDC ±10%, 8.5W max
- Operating Temperature: -20°C to +65°C
- Input Accuracy: ±0.05% full scale
- Scan/Update Rate: 5 ms per channel
- Output Load: 800Ω max for 4–20mA
- Hazardous Rating: Class I Div 2, Zone 2, ATEX/IECEx
- Dimensions: 147 × 51.5 × 114 mm
- Weight: 0.60 kg
IS220PAOCH1A
The Real-World Problem It Solves
Legacy systems use separate AI, AO, and HART modems, creating cabinet clutter and signal integrity issues. Fast processes need sub-10ms updates that low-end modules can’t deliver.
Where you’ll typically find it:
- Gas turbine fuel flow and temperature transmitter loops
- Steam turbine inlet control valve analog positioning
- Compressor anti-surge pressure and flow HART I/O
Bottom line: cuts cabinet density, boosts HART speed, and eliminates ground loops in high-speed turbine analog loops.
Hardware Architecture & Under-the-Hood Logic
runs on a dedicated 32-bit RISC processor with 16MB SDRAM / 32MB Flash. Full galvanic isolation separates field signals from backplane electronics.
- Field 4–20mA signals terminate at the DC-37 connector.
- Signals cross 2500V optical isolation barriers.
- Inputs filtered and digitized by 16-bit ADCs at 5ms intervals.
- On-board processor decodes HART telemetry and runs diagnostics.
- Data transmits over redundant IONet to Mark VIe controller.
- Output commands drive 14-bit DACs with short-circuit protection.
- Front-panel LEDs indicate power, fault, network, and HART status.
IS220PAOCH1A
Field Service Pitfalls: What Rookies Get Wrong
Unshielded Cable in Cable TraysRookies run analog wires alongside 480V power cables. EMI induces noise that drifts readings beyond tolerance.
- Field Rule: Use twisted-pair, foil-shielded cable. Ground shield only at the cabinet end.
Under-Sized Power SupplyTechs use 24V/0.5A supplies. Voltage drop under full load causes unstable outputs and HART dropouts.
- Quick Fix: Install 24V/2A supply. Verify 24.0 VDC minimum at module terminals under full load.
Incorrect HART TerminationRookies skip 250Ω resistors or use 5% tolerance parts. This breaks HART communication and locks transmitter access.
- Field Rule: Install 250Ω ±1% resistors on all analog input channels.
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.
