2700839 IB ST 24 AO 4/EF PHOENIX

The Phoenix Contact Termination Unit streamlines signal marshalling and system wiring by grouping multiple channels into a modular, structured platform. It utilizes pluggable interface modules, signal conditioners, and intrinsic safety barriers that easily snap onto the base unit, allowing quick installation and system expansion. Field cables connect directly to standard screw, spring-cage, or Push-in technology terminals, while multi-pin system cables (such as VARIOFACE connectors or ribbon cables) connect the termination unit to specific I/O modules of the control system. This eliminates the need for manual point-to-point wiring between terminal blocks and control cards, reducing cabinet space requirements and installation time.

Product Parameters

• Connection Method Field Side: Push-in connection technology, spring-cage clamps, or conventional screw connections accepting wire gauges from 24 AWG up to 12 AWG.

• Connection Method Control Side: High-density system connectors, including FLK ribbon cable headers, D-SUB connectors, or system-specific multi-pin plugs.

• Nominal Operating Voltage: Typically 24 VDC, with support for voltages up to 250 VAC/DC depending on the specific model and channel isolation.

• Maximum Current per Channel: Standard continuous channel rating up to 1 A or 2 A, with total board bus current capacity ranging up to 10 A or higher.

• Number of Channels: Available in configurations supporting 8, 16, or 32 channels per base unit.

• Mounting Type: Direct mounting on standard DIN rail (NS 35/7.5 or NS 35/15) or direct mounting panel plates inside control cabinets.

• Operating Temperature: Standard industrial range from -20°C to 60°C (-4°F to 140°F).

• Storage Temperature: Extended storage range from -40°C to 85°C (-40°F to 185°F).

• Degree of Protection: IP20 rated for cabinet installation environments.

• Status Indicators: Integrated LED indicators per channel for power supply diagnostics, signal state verification, and fault identification.

Product Advantages

A major advantage of the Phoenix Termination Unit is the dramatic reduction in wiring time and error risk offered by prefabricated system cabling solutions instead of manual terminal-by-terminal wiring.

The modular design allows for flexible system scaling, permitting easy replacement or upgrade of individual signal conditioners, relays, or isolation modules without disturbing adjacent channel wiring.

Integrated test points and LED status indicators enable rapid diagnostics during commissioning and routine maintenance, minimizing system downtime.

The high wiring density saves significant space inside control enclosures, enabling smaller panel footprints and lowering overall enclosure build costs.

Enhanced electrical safety features, including optional integrated fuses and surge protection components, safeguard sensitive control system inputs against field transients and overcurrent conditions.

Important Considerations and Precautions

When selecting and installing a Phoenix Contact Termination Unit, engineers must verify that the total current load across all channels does not exceed the maximum bus current rating of the baseboard.

Proper wire stripping lengths and tightening torques (for screw connection models) must be observed to maintain secure, low-resistance connections and prevent wire pull-out.

When installing termination units carrying mixed signal types, ensure proper physical separation and shielding between sensitive analog signals and high-voltage digital or switching lines to prevent electromagnetic interference.

Units deployed in explosive or hazardous environments must be certified for the specific zone (such as ATEX or IECEx) and paired with appropriate intrinsic safety barriers.

Always isolate the main system power before plugging or unplugging system cables and module components to avoid arcing or damage to sensitive electronic control cards.

Product Applications

Phoenix Termination Units are widely deployed across various process automation and discrete manufacturing sectors where high-density, organized wiring is required.

• Process Industry Signal Marshalling: Interfacing field instruments such as temperature transmitters, pressure sensors, and control valves with DCS systems in oil refineries, chemical plants, and water treatment facilities.

• Factory Automation PLC Wiring: Connecting multi-channel digital I/O cards to field devices like limit switches, solenoids, and optical sensors using high-density system cables.

• Power Generation and Distribution: Managing auxiliary signals, fault indications, and relay switching outputs inside power plant control panels and substation automation cabinets.

• Building Management Systems: Interfacing centralized HVAC controllers, energy meters, and environmental sensors across large commercial facilities.

• OEM Machinery Building: Simplifying panel manufacturing and field commissioning for packaging machines, assembly lines, and material handling systems by utilizing pluggable pre-tested cable assemblies.

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