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Honeywell 8C-TAIXA1
Product Name: Series 8 Non-Redundant Analog Input I/O Termination Assembly (IOTA) — 6-inch, G3 coated
Product Introduction: The 8C-TAIXA1 (part number 51307125-175) is a non-redundant analog input I/O Termination Assembly within the Experion PKS Series 8 C300 platform. It serves as the physical and electrical foundation — providing screw-terminal field wiring connections and the mounting carrier — for a 16-channel Series 8 analog input I/O module such as the 8C-PAIHA1 (HART-enabled AI). The assembly features factory G3 conformal coating on all traces, terminal blocks, and passive components.
Detailed content
Technical Specifications:
- Product type: Non-Redundant Analog Input IOTA (baseplate-integrated)
- Supported I/O module: 8C-PAIHA1 (16-channel Analog Input with HART)
- Channel capacity: 16 channels
- Input signal: 4–20 mA DC (through 250 Ω resistor)
- Field device support: 2-wire loop-powered or 4-wire self-powered transmitters
- Operating voltage rating: 24 VDC
- Maximum input voltage: ±30 V (any input to common, no damage)
- IOTA width: 6 inches (compact form factor)
- Hot-swap (RIUP): Supported — I/O module can be removed/inserted under power while field wiring remains attached
- Weight: ~0.45 kg
- Dimensions: 152 × 125 × 40 mm
- Surface protection: Factory G3 conformal coated
- Redundancy: Non-redundant (single-module carrier)
Functional Features:
- Compact 6-inch baseplate form factor saves DIN-rail space
- G3 conformal coating protects traces, solder joints, and terminals from corrosive gases and humidity
- Integral bus interconnects route 24 VDC system power and high-speed I/O Link communication
- Screw-type terminal block connections for permanent field wiring
- RIUP capability — field wiring stays intact during module replacement, minimizing downtime
- Single-module carrier for non-redundant control configurations
Application Scenarios: Physical termination base for non-redundant 16-channel AI modules in Experion PKS Series 8 cabinets. Deployed for field wiring of pressure transmitters, temperature transmitters (via 4–20 mA), flowmeters, and level sensors. Suitable for hazardous and corrosive plant enclosures where G3-coated termination hardware is required.
Structural & Material Characteristics: The IOTA is a 6-inch-wide baseplate with a multi-pin I/O module socket, screw terminal strips for 16 channels of 4–20 mA transmitter loops, and internal bus routing for 24 VDC distribution. The entire board is conformal-coated. Its vertical orientation optimizes cabinet density and natural convection.
Working Principle: The IOTA receives 4–20 mA signals from field transmitters via screw terminals. The 250 Ω resistor on the IOTA (or within the mated I/O module) develops the voltage for A/D conversion. The I/O module plugs into the multi-pin backplane connector, establishing both signal and 24 VDC power paths to the C300 controller over the I/O Link.
Installation Requirements:
- Panel DC power supplies must be isolated before mounting
- Mount on the Series 8 carrier rail; insert the 8C-PAIHA1 (or compatible AI) module into the IOTA socket
- Use fine-stranded wire with ferrules for all terminal connections
- For redundant AI, this IOTA is NOT suitable — a redundant IOTA variant must be used
Usage Notes:
- This IOTA is non-redundant; it supports only a single I/O module. For redundant 16-channel AI, use the redundant IOTA variant.
- The 24 VDC field power is distributed from the system power supply through the Series 8 carrier bus
- G3 coating provides extra protection even in non-corrosive control-room environments
- During hot-swap, ensure the IOTA remains powered and field wiring undisturbed
