Description Product Introduction The GE IS220PAICH2A 336A4940CSP11 is an I/O pack from GE’s Mark VIe distributed control platform—the system you find in gas turbine packages, steam turbine controls, and generator excitation panels. This specific pack handles analog inputs: pressure transmitters, thermocouples, RTDs, and position feedback. It mounts remotely from the main controller, communicating over the IONet (GE’s high-speed deterministic network). What sets the GE IS220PAICH2A 336A4940CSP11 apart from earlier Mark VI I/O (the IS200 series) is the network architecture. Mark VIe moved to a fully distributed model. This pack has its own processor, runs its own I/O scanning, and reports back to the main controller over Ethernet. If you lose one I/O pack, the rest keep running. The “A” suffix indicates the final revision with improved thermocouple linearization and better cold-junction compensation. In my experience, the earlier non-A version had a drift issue on Type K thermocouples above 800°C. The A revision fixed it. Key Technical Specifications Parameter Specification Model GE IS220PAICH2A 336A4940CSP11 Series Mark VIe I/O Count 12 analog inputs Input Types 4-20 mA, 0-10 V, RTD (2-wire, 3-wire, 4-wire), Thermocouple (J, K, T, E, R, S, B) Resolution 16 bits Accuracy ±0.1% of full scale (voltage/current), ±1°C (thermocouple) Update Rate 10 ms (typical) Communication IONet (100 Mbps Ethernet, deterministic) Power Supply 24 VDC (from Mark VIe power supply) Isolation 1500 VAC between field and logic Diagnostic LEDs Power, Network Status, Fault, Channel Status Mounting DIN-rail or panel mount Operating Temp -30°C to 65°C Termination Terminal blocks integrated into the pack Firmware / Software Versions & Upgrade Notes The GE IS220PAICH2A 336A4940CSP11 contains its own firmware that is field-upgradable via the IONet using ToolboxST. Minimum firmware: Version 5.0 (required for the “A” hardware revision). Earlier firmware does not recognize the improved cold-junction compensation. Recommended firmware: Version 6.2 or later. Version 6.2 adds support for high-accuracy thermocouple linearization per NIST ITS-90 standards. Software compatibility: ToolboxST version 3.0 or later. Version 2.x cannot properly configure the “A” revision’s expanded input type options. Upgrade procedure: Connect ToolboxST to the Mark VIe controller, navigate to the I/O pack, select “Firmware Upgrade,” and follow prompts. Takes about 90 seconds. The I/O pack will reboot and lose communication for about 15 seconds. The turbine continues running—other I/O packs handle their own loops. Rollback: Supported but requires re-downloading the configuration. If you downgrade firmware, the I/O pack may lose its calibration constants. Re-calibrate after rollback. ⚠️ Field note: The GE IS220PAICH2A 336A4940CSP11 has a specific grounding requirement. The shield terminal on the I/O pack must connect to the Mark VIe chassis ground, not the field-side ground. I’ve seen ground loops cause erratic RTD readings when someone bonded the shield to the field ground bar. The manual is explicit about this—and it matters. Compatibility & Replacement Matrix Original Model Replacement Model Compatibility Level Key Notes GE IS200PAICH2 (Mark VI) GE IS220PAICH2A 336A4940CSP11 Incompatible Mark VI uses VME backplane communication. Mark VIe uses IONet. You cannot mix them. The I/O pack itself is a different form factor. GE IS220PAICH2 (non-A) GE IS220PAICH2A 336A4940CSP11 Drop-in Same mounting, same termination. The A revision has improved thermocouple linearization. Existing configuration works but you may want to update ToolboxST to access the enhanced accuracy. GE IS220PAICH1 (different variant) GE IS220PAICH2A 336A4940CSP11 Needs adaptation PAICH1 has 8 channels, not 12. Wiring is different. You’ll need to re-terminate field wires to match the 12-channel layout. GE IS220PDIAH1 (digital I/O pack) GE IS220PAICH2A 336A4940CSP11 Incompatible Different function. Termination is not compatible. Third-party I/O GE IS220PAICH2A 336A4940CSP11 Incompatible Mark VIe IONet is proprietary. No third-party I/O packs exist. Frequently Asked Questions Q: How do I configure an input for thermocouple vs. 4-20 mA? Configuration is done in ToolboxST. Select the channel in the I/O pack configuration tree, choose the input type from the dropdown menu, and set scaling parameters. The GE IS220PAICH2A 336A4940CSP11 has no jumpers or dip switches—all configuration is software-based. Download the configuration to the controller, and the I/O pack updates itself. Q: Does this pack support HART pass-through? No. The GE IS220PAICH2A 336A4940CSP11 is analog-only. If you need HART communication, you need the IS220PPROH1 or a separate HART multiplexer. The analog inputs read the 4-20 mA loop but do not process the digital HART signal. Q: What’s the difference between PAICH2 and PAICH2A? The “A” revision adds improved cold-junction compensation for thermocouples, better transient protection on the analog inputs, and support for additional thermocouple types (including B and R types). The non-A version works, but the A version is more stable in high-vibration environments—turbine decks, specifically. Q: My I/O pack shows a red “FAIL” LED. What do I do? Red FAIL on the GE IS220PAICH2A 336A4940CSP11 usually means the pack has lost communication with the Mark VIe controller. Check the IONet connections (the two Ethernet ports on the pack). If the network is up, try power-cycling the pack. If it still fails, the pack may have a hardware fault. Replace it—hot swap is supported. Q: Can I hot-swap this I/O pack? Yes. The Mark VIe system supports hot-swapping I/O packs. Remove the failed GE IS220PAICH2A 336A4940CSP11 and insert the replacement. The system will automatically recognize it and reload the configuration. The turbine control loop may see a brief data interruption (one scan cycle), but it will not trip. Q: How do I wire a 3-wire RTD to this pack? The GE IS220PAICH2A 336A4940CSP11 has dedicated terminals for each RTD wire. Connect the excitation wire to EXC , the positive sense to SEN , and the common to COM. The pack uses a ratiometric measurement to cancel lead resistance. Wire it exactly per the terminal label—swapping sense and excitation wires will give you negative readings. Q: What’s the IONet and why does it matter? IONet is GE’s deterministic Ethernet protocol for Mark VIe. The GE IS220PAICH2A 336A4940CSP11 uses two Ethernet ports in a redundant ring topology. If one cable fails, the ring recovers in under 10 ms. The I/O pack doesn’t have an IP address in the conventional sense—it’s addressed by its slot position in the ToolboxST configuration. 3HE04741AA PLC 43AP-FA54C/TA-1A CPU IS200VSVOH1B PLC IS200VTURH1B IS200VVIBH1C IS200TSVOH1B IS200TVIBH2B IS200TPROH1B PLC Email: [email protected] Phone: 86 15340683922 Sales:Wu Jiedong Our products are guaranteed for 1 year, with new and original production stopped and imported spare parts. All prices listed on the official website are subject to confirmation by contact: Wu Jiedong (manager). Our product: brand new original packaging Our warranty: All new or repaired parts have a 12 month warranty period beginning Our payment: 100% telegraphic transfer of inventory items before shipment, conditions can be proposed! If you have any downtime spare parts that you cannot find, please feel free to call or use email to contact me. If there are issues that the product cannot solve, please contact me. Product prices can be negotiated. 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