PHOENIX CONTACT PLC-BSC-24DC/21

Model Definition

1. Modelo Completo: PLC-BSC-24DC/21
2. Número do pedido: 2966016
3. Série de marcas: Contato Fênix CLP-INTERFACE ultra-slim relay base
4. Análise do modelo

CLP: Base for PLC interface relay module

BSC: Basic economical base with screw connection

24CC: Rated control coil voltage DC24V

21: 1 contato de mudança (1NÃO + 1NC, 1PDT single-pole double-throw)

5. Descrição do produto: Base only, relay insert not included. Must be used with matching pluggable relays (2961105 / 2961118).
6. Electrical Specifications of Control Side Input (A1+/A2-)
7. Tensão nominal de controle: 24 Em DC
8. Faixa de tensão operacional: 19.2 Em DC ~ 30 Em DC
9. Built-in Protection Circuit: Freewheeling damping diode + reverse polarity protection diode to prevent PLC output burnout from reverse connection
10. Status Indicator: Integrated yellow LED on base, lights steadily when coil is energized
11. Input Power Consumption: Aprox.. 1.1 C
12. Minimum Driving Current: 5 mA, directly compatible with PLC NPN/PNP transistor outputs (S7-1200/1500, Mitsubishi, Inovação, etc.)
13. Rated Parameters of Load-side Contacts (12/11 Comum, 14 Normalmente aberto, 12 Normalmente fechado)

3.1 General Load Ratings

Tensão máxima de comutação: 250 V e / 30 Em DC

Rated Continuous Thermal Current Ith: 6 UM

AC-15 Inductive Load (Contactor Coils): 6 UM / 250 V e

DC-13 Inductive Load (Válvulas Solenóides): 3 UM / 24 Em DC

3.2 Isolamento & Suportar Tensão

Isolation Withstand Voltage (Coil to Contacts): 4 kV AC for 1 minuto

Withstand Voltage across Open Contacts: 2 kV CA

Resistência de Isolamento (CC 500 V Test): ≥10⁹ Ω

3.3 Resistência Elétrica (with Original Phoenix Relay Insert)

6 UM / 250 V e: 100,000 operações

3 UM / 24 Em DC: 200,000 operações

3.4 Formulário de contato: 1PDT Single-Pole Double-Throw (11 Comum, 14 NÃO, 12 NC)

4. Dimensões Mecânicas & Montagem
5. Largura: 6.2 milímetros (ultra-slim design saves DIN rail space, zero-gap side-by-side mounting supported)
6. Dimensões Gerais: W6.2 mm × H94 mm × D80 mm
7. Trilho de montagem: Standard DIN NS35/7.5 rail
8. Housing Flame Retardancy: UL94 V0
9. Cor: Base body grey-green, relay latch orange
10. Peso: Aprox.. 45 g
11. Terminal Specifications (All M3 Screw Terminals)
12. Fios Aplicáveis:

Solid single-core wire: 0.14~2.5 mm²

Stranded multi-core wire: 0.14~2.5 mm²; máx.. 2.5 mm² with ferrule terminals

AWG Range: 26 AWG ~ 14 AWG

2. Torque do parafuso: 0.6~0.8 N·m
3. Comprimento de decapagem de fio: 8 milímetros
4. Terminal Partition

Left Side: Control circuit A1+, A2(connect to PLC outputs)

Right Side: Load circuit 12(NC), 11(COM), 14(NÃO)

6. Condições ambientais & Aprovações
7. Temperatura operacional: -25 ℃ ~ +60 ℃
8. Armazenar & Transport Temperature: -40 ℃ ~ +85 ℃
9. Grau de poluição: 3, for indoor industrial control cabinet installation
10. Certificações: CE, cULus, VDE, GL Marine Approval, RoHS Compliant
11. EMC Class: Class A industrial equipment
12. Matching Relay Inserts (Must Be Ordered Separately)

8. Cenários típicos de aplicação
9. PLC digital output isolation to drive small contactors, solenoid valves and indicator lights
10. IO signal transfer and separation of strong/weak current on automated production lines
11. On-off control of small loads for machine tools, packaging equipment and assembly lines
12. Ultra-slim modular signal expansion for high-density IO cabinets
13. Series Model Selection Comparison

10. Brief Wiring Logic
11. Connect 24 V DC PLC output to base terminals A1(+) and A2(-); LED illuminates and relay pulls in.
12. Pull-in State: 11(COM) ↔ 14(NÃO) fechado; 11 disconnected from 12(NC).
13. De-energized State: 11(COM) ↔ 12(NC) fechado; 11 disconnected from 14(NÃO).
14. Load Circuit: Connect AC220 V / DC24 V loads to COM+NO or COM+NC for switching control.
15. Troubleshooting Guidelines
16. LED apagado: No PLC output, reversed A1/A2 wiring, loose terminals
17. LED on but load inactive: Damaged relay insert, loose contact wiring, open-circuit load
18. Frequent contact ablation: Load current exceeds 6 UM; external auxiliary contactor required for capacity expansion
19. Unintended operation: No absorption component for inductive PLC loads; freewheeling diode can be paralleled on the base side

Application Scenarios of PHOENIX CONTACT PLC-BSC-24DC/21 (2966016)

This 6.2 mm ultra-slim PLC interface relay base mainly realizes PLC transistor output isolation & transfer, strong/weak current separation and small load switching for compact control cabinet wiring. It fits all 24 V DC PLC digital output applications, categorized into industry segments, equipment types and cabinet internal functions as below:

1. General Automation OEM Equipment Applications

1.1 Máquinas-ferramentas & Metal Processing Equipment

CNC lathes, centros de usinagem, moedores, punch presses: PLC outputs drive cooling solenoid valves, lubrication pumps, tool magazine cylinders, indicator lights and small contactor coils

Bending machines, máquinas de corte: Control pneumatic clamps, safety door warning lights and alarm buzzers

Vantagens: Ultra-slim to save cabinet space; pluggable relay allows fast replacement without wire disconnection during machine breakdowns

1.2 Embalagem, Enchimento & Food Processing Machinery

Beverage filling machines, rotuladores, flow wrapping machines, classificação & rejection equipment

Control material distributing cylinders, photoelectric rejection valves, conveyor start/stop, fault warning lights and hot air blowers

Suitable for clean-room control cabinets; screw terminals resist vibration and maintain stable service life under frequent switching cycles

1.3 3C Electronics, Lithium Battery & PV Equipment

Máquinas de colocação SMT, dispensers, lithium battery filling/sealing equipment, PV module production lines

Drive micro solenoid valves, vacuum generators, sensor indicator lights and small signal contactors

High-density PLC output points fit the 6.2 mm narrow design for compact arrangement to solve space shortage in IO cabinets

1.4 Conveying & Equipamento Logístico

Transportadores de correia, roller lines, automated warehouses, sorting lines, control cabinets matched with AGVs

Control track switch cylinders, stopper cylinders, position indicator lights, audio-visual fault alarms and guard lock prompts

2. Discrete Manufacturing Production Line Applications
3. Automotive Assembly Lines

Soldagem, coating and final assembly stations: Solenoid valves for robot clamps, station indicator lights, safety bypass prompts and pneumatic clamping mechanisms. Isolates heavy interference from welding machines to protect PLC output points from breakdown induced by inductive loads.

2. Borracha & Plastic Molding Equipment

Máquinas de moldagem por injeção, extrusoras: Barrel cooling fans, material suction solenoid valves, mold temperature controller signal switching and safety door status indicator lights

3. Impressão & Máquinas Têxteis

Printing presses, warp knitting machines, impressão & dyeing equipment: Tension cylinders, ink valves, shutdown alarms and fabric deviation correction actuators

3. Municipal, Tratamento de Água & HVAC Integrated Control Cabinets
4. Estações de tratamento de esgoto, water supply pump station control cabinets: Bar screen alarms, electric valve signals, liquid level indicator lights and auxiliary control of submersible pumps
5. Ar condicionado central & air purification units: Air damper actuators, humidifier solenoid valves and differential pressure alarm lights
6. Building intelligent control: Lighting zoning control, exaustores, access status feedback and fire linkage signal transfer

Características: Designed for 24/7 operação contínua; built-in freewheeling diode suppresses solenoid valve surge voltage to protect PLC I/O cards

4. Nova Energia, Armazenamento de energia & Test Equipment
5. Control cabinets matched with PCS energy storage converters, lithium battery testing equipment and auxiliary cabinets of PV inverters
6. High/low voltage electrical test benches and aging test equipment: Signal switching for test points, indicator lights and micro solenoid valves

Ampla faixa de temperatura operacional (-25 ℃ ~ +60 ℃) fits indoor machine rooms and constant-temperature outdoor control cabinets

5. Trânsito Ferroviário & Small Construction Machinery Matching

Metro platform screen door control cabinets, electrical boxes for small construction machinery (loaders, máquinas de corte)

Drive warning lights, electromagnetic directional valves and operation panel indicator lights; vibration-resistant screw terminals prevent loose wiring

6. Typical Internal Cabinet Functional Applications (General Retrofit & Project Matching)
7. PLC Output Isolation Protection (Função principal)

24 V transistor PLCs including Siemens S7-1200/1500, Allen‑Bradley, Mitsubishi, Inovance and Xinje only supply 0.5 A output current, insufficient to directly drive solenoid valves or contactors. This relay expands the switching capacity to 6 A and isolates back EMF from inductive loads to avoid I/O point burnout.

2. Physical Separation of Strong & Weak Current Signals

4 kV insulation isolation between 24 V weak-current PLC control circuits and 220 V AC load circuits prevents high voltage back-feed to controllers and improves equipment safety rating.

3. High-Density IO Cabinet Wiring

6.2 mm ultra-slim width supports zero-gap side-by-side installation, doubling the number of relays on the same DIN rail length, ideal for centralized cabinets with massive I/O points.

4. Signal Distribution & Contact Conversion

1 set of changeover contacts (1NÃO+1NC) enables one PLC signal to control two different loads simultaneously; NC contact can be used for fault alarm circuits.

5. Equipment Retrofit & Old Cabinet Capacity Expansion

Replaces standard 14 mm wide relay bases to save rail space when existing cabinet space is limited. Pluggable relay design allows on-site maintenance without wire disconnection and reduces downtime.

7. Not Recommended Application Scenarios (Application Limitations)
8. Safety circuits, emergency stop and safety door interlocks (440R series safety relays are required; this product has no force-guided contacts and fails to meet PL e safety certification)
9. High-power loads (single channel exceeding 6 A AC-15 / 3 A DC-13; external high-capacity contactors required for capacity expansion)
10. Outdoor unenclosed enclosures (Classificação de proteção IP20; must be installed inside standard sealed control cabinets)
11. Unshielded cabinets with heavy interference from high-frequency high-voltage large inverters (surge suppressors must be added for matching use)

Complete Mounting Instructions for PHOENIX CONTACT PLC-BSC-24DC/21 (2966016)

1. Basic Mounting Type: Standard DIN Rail Snap-in Installation (Only Official Mounting Method)
2. Applicable Rail Specification

Only compatible with national/European standard NS 35/7.5 DIN mounting rail (35 mm largura, 7.5 mm height). Direct panel mounting via drilled holes or wall screw mounting is not supported.

2. Arrangement Characteristics

Zero-gap dense side-by-side mounting available; o 6.2 mm slim design requires no reserved heat dissipation gap for high-density IO cabinet layout. Install PLC-ATP insulating partitions between adjacent modules with mixed high/low voltage circuits for reinforced electrical isolation.

3. Unrestricted Mounting Orientation

Can be mounted horizontally, laterally or vertically with no mandatory angle; only ensure adequate ventilation inside the control cabinet.

2. Step-by-Step Rail Assembly & Desmontagem

2.1 Base Installation Steps

1. Remove oil stains and metal debris from the DIN rail surface and fix the rail firmly to the cabinet mounting plate.
2. Hook the upper rear latch of the base onto the top edge of the DIN rail slot.
3. Press down the lower half of the base until an audible click confirms the spring latch locks the base fully against the rail.
4. Install multiple modules side by side seamlessly in sequence.
5. Fit end stoppers at both rail ends if positioning is required to prevent sliding caused by vibration.

2.2 Base Removal Steps

1. Cut off power and disconnect all wiring.
2. Insert a flathead screwdriver into the spring latch slot at the bottom of the base.
3. Pry downwards to release the lower locking mechanism.
4. Tilt the bottom edge outward and lift the base up to disengage from the upper rail edge for removal.
5. Relay Insert Plug-in Installation (Base Matching Operation)

This product is base-only and must be paired with 2961105 / 2961118 relay inserts:

1. Align the relay with the upper slot of the base and press straight down for insertion.
2. The orange latch automatically locks to prevent loosening under vibration.
3. Removal: Pinch the orange latch to flip outward, then pull the relay insert upward for quick replacement without disconnecting wires.
4. Terminal Wiring Installation (M3 Screw Connection)
5. Standard wire stripping length: Fixed at 8 milímetros; excessive length risks short circuits, insufficient length causes poor contact.
6. Applicable Cables: 0.14~2.5 mm² solid/stranded wires, AWG26~14; ferrule terminals are recommended for stranded wires.
7. Torque de aperto: 0.6~0.8 N·m; excessive torque strips screws, insufficient torque leads to heat and poor contact.
8. Terminal Partition: Left side A1/A2 (PLC control circuit); Right side 11/12/14 (load contact circuit). Clear zoning facilitates wiring.
9. Optional Matching Mounting Accessories
10. PLC-ATP Insulating Partition: Install between adjacent modules where one side carries 220 V high voltage and the other carries 24 V low voltage to strengthen electrical isolation.
11. FBST Plug-in Bridge Connectors: Compartilhar 24 V power supply for multiple modules to parallel A1/A2 terminals in batches and reduce redundant wiring.
12. DIN Rail End Stoppers: Secure both ends of a full row of modules to prevent sliding and dropping during equipment transportation and vibration.
13. Mounting Environment & Restrictions
14. Classificação de proteção IP20; only for installation inside sealed control cabinets. Outdoor and unenclosed box installation prohibited.
15. Operating ambient temperature: -25 ℃ ~ +60 ℃; reserve ≥10 mm clearance above modules for heat dissipation.
16. Keep away from heat-intensive and high-interference devices such as inverters and contactors; avoid tight fitting with high-power heat sources.
17. Do not install in areas with direct exposure to water mist, heavy dust or corrosive gas.
18. Mounting Prohibitions
19. Violent knocking of base or relay insert is forbidden to avoid rear latch fracture.
20. Do not pull the base diagonally with force to prevent rail deformation and latch damage.
21. High/low voltage modules cannot be placed closely without insulating partitions, which carries risk of dielectric breakdown and electric leakage.
22. Exposed loose copper strands from multi-core wires at terminals are prohibited to avoid phase-to-phase short circuits.