HIMA XAL-TERM

Core Technical Specifications

• Compatible Module Model: X-AI3201, X-AO1601, X-DI6401, X-DO3201 full range HIMA X-series high-density safety I/O modules
• Single Terminal Channel Capacity: 2 signal wiring pins per terminal unit, expandable combined rack for maximum 32-channel centralized wiring matching X-AI3201
• Allowed Conductor Specification: Solid copper wire 0.5–2.5mm², stranded copper wire 0.5–1.5mm² with crimp ferrule
• Spring Clamp Rated Current: Max 5A per single channel terminal
• Withstand Isolation Voltage: 1500 VDC between adjacent signal channels, consistent with X-AI3201 channel isolation standard
• Operating Temperature Range: -40°C ~ +70°C
• Protection Class: IP20 when fully assembled with module
• Flame Retardant Grade: UL94 V-0 high flame retardant plastic housing
• Assembly Weight: Complete 32-channel terminal rack assembly 0.92kg
• Certification Standard: TÜV SIL3 wiring accessory certification, ATEX IECEx matching certification for hazardous zone cabinet use

Functional Features

1. Split modular combination design, freely splice terminal units according to module channel count; perfectly match 32-channel layout of X-AI3201 without redundant empty terminals
2. Built-in integrated shielding grounding bus bar, centralized connection of all field instrument cable shielding layers to safety ground, avoid scattered single-point grounding confusion
3. Independent wire strain relief buckle on each terminal unit, fix external instrument cables to prevent pulling force damaging internal spring clamp contact
4. Tool-free spring quick plug structure, insert stripped wire directly into terminal hole, press release button to quickly release wire; greatly shorten wiring and maintenance time
5. Channel isolation partition between adjacent terminal pins, eliminate cross-channel signal crosstalk and leakage current interference in high-density wiring layout
6. Printed clear channel number marking on front surface of each terminal unit, one-to-one corresponding to module internal channel address, convenient for field troubleshooting
7. Anti-loose spring steel clip with memory elasticity, long-term vibration operation in chemical plant will not cause wire loosening or signal interruption
8. Full compatibility with HIMA redundant backplane mounting bracket, unified installation size, no extra customized cabinet bracket required

Working Principle

1. Field 4–20mA HART transmitter signal shielded cables pass through strain relief buckle of XAL-TERM terminal unit, stripped conductors inserted into spring clamp pins to realize electrical connection between field equipment and X-AI3201 module internal sampling circuit.
2. All cable shielding layers are uniformly clamped to the built-in grounding bus bar of XAL-TERM, connected to cabinet safety ground through dedicated ground wire, forming closed shielding loop to block external electromagnetic interference entering safety signal lines.
3. Independent isolation partitions separate each signal channel terminal pin, avoid leakage current between adjacent channels leading to signal drift or false safety fault diagnosis.
4. Built-in elastic spring clamp maintains constant contact pressure on copper conductors under wide temperature fluctuation and mechanical vibration, stable signal transmission without contact resistance increase.
5. Channel number printing on terminal surface provides direct one-to-one mapping with module software channel addresses, maintenance staff can quickly locate faulty sensor channels according to module fault code.

Structure & Material Composition

• Terminal Housing Body: UL94 V-0 flame retardant reinforced PA66 plastic, anti-aging, low smoke non-toxic under high temperature burning
• Spring Clamp Core: Imported beryllium copper alloy spring steel, high elasticity fatigue resistance, oxidation resistant surface gold plating treatment
• Central Ground Bus Bar: Solid copper tin-plated conductive strip, low resistance for shielding ground convergence
• Wire Strain Relief Buckle: Flexible high toughness TPU plastic, buffer external cable pulling and twisting force
• Isolation Partition: Hard PET insulating sheet, high voltage resistant, prevent inter-channel short circuit
• Assembly Mounting Bracket: Cold rolled steel sheet electrostatic black spraying, fixed to cabinet DIN rail together with safety module rack

Installation Requirements

1. Pre-assemble XAL-TERM terminal rack matching channel quantity before installing X-AI3201 module on backplane; lock terminal assembly to same DIN rail bracket of safety module
2. All field instrument cables must pass through strain relief buckle first before inserting conductors into spring clamp pins; reserve 10–15cm cable slack to avoid tension on terminals
3. Shielding layer of each shielded twisted cable must be firmly clamped to central grounding bus bar of XAL-TERM; scattered separate grounding of single cable shield is prohibited
4. Conductor stripping length strictly controlled at 8–10mm; excessive stripping causes adjacent channel short circuit, insufficient stripping leads to poor spring contact
5. Keep XAL-TERM terminal assembly away from heat sources such as power supply modules, heating resistors; minimum separation distance 25mm
6. Cabinet safety ground wire connect central ground bus bar of XAL-TERM with wire specification ≥2.5mm² copper cable

Application Scenarios

Operation & Maintenance Precautions

1. All wiring modification, terminal disassembly work must be carried out after cutting off module X-BUS backplane power and field transmitter 24V loop power supply
2. Do not use non-matching third-party terminal blocks to replace XAL-TERM; uncertified terminals will cause loss of SIL3 functional safety certification of the whole safety loop
3. Inspect spring clamp tightness and cable strain relief buckle every 6 months for vibration-intensive workshop environments; replace aged TPU buckles if cracking appears
4. Do not expose XAL-TERM terminal assembly to direct splashing of process chemical liquid; liquid infiltration will cause inter-channel leakage and safety signal deviation
5. Clean terminal surface accumulated dust only with dry oil-free compressed air; liquid cleaning agents are forbidden to avoid damaging plastic insulation housing
6. When replacing single damaged terminal unit, ensure channel number marking consistent with original assembly to prevent channel address misalignment after maintenance