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Independent safety relay of PILZ PNOZsigma series, 24VDC power supply, 3NO+1NC+1SO output. Compliant with safety levels PL e / Cat.4 / SIL 3, suitable for safety loop monitoring such as emergency stop, puerta de seguridad y cortina de luz de seguridad.
- Definición del segmento del modelo
| Segmento de modelo | Significado | Descripción |
| 750104 | Número de pedido. | Exclusive official identification code of PILZ |
| PNOZ | Serie de productos | Standard safety relay series mark of PILZ |
| s4 | Sufijo del modelo | s = Sigma series; 4 = channel configuration (3 safety outputs + 1 auxiliary output) |
| 24VCC | Voltaje de suministro | CC 24 V (wide range: 18–28V) |
| 3 n/o 1 n/c | Configuración de contacto | 3 normally open safety contacts + 1 contacto auxiliar normalmente cerrado |
- Core Specification Parameter Table
| Categoría de parámetro | Índice técnico | Observaciones |
| Parámetros básicos | ||
| Voltaje de suministro | 24VCC (-15%/+10%) | 18–28V DC |
| Consumo de energía | ≈2.5W | Operating status |
| Dimensiones | 22.5milímetros(W.) × 90 mm(h) × 65mm(D) | Montaje en carril DIN, ahorro de espacio |
| Peso | Aprox.. 120gramo | |
| Desempeño de seguridad | ||
| Nivel de seguridad | pl y / Cat.4 (EN ISO 13849-1) | El más alto nivel de seguridad |
| Safety Integrity | SIL 3 (CEI 61508) | Applicable to high-risk scenarios |
| Tiempo de respuesta | ≤150ms | Fast cut-off of safety loop |
| Input Configuration | ||
| Tipo de entrada | Dual-channel safety input | S11-S12, S21-S22 |
| Input Function | Support single/dual-channel wiring, with/without inter-contact short-circuit detection | Switchable via side knob |
| Modo de reinicio | Manual / Automatic optional | Adjust by red knob (A=Auto, ↑=Rising-edge Manual) |
| Output Configuration | ||
| Salida de seguridad | 3NO (13-14, 23-24, 33-34) | Forced guided contacts; 6A/240VAC AC-1, 6A/24VDC DC-1 |
| Salida auxiliar | 1CAROLINA DEL NORTE (41-42) | 6A/240VAC AC-1, 6A/24VDC DC-1 |
| Semiconductor Output | 1SO (Y32) | PNP type, máximo. 0.5A, for status feedback |
| Condiciones ambientales | ||
| Temperatura de funcionamiento | -25℃ ~ +55 ℃ | |
| Temperatura de almacenamiento | -40℃ ~ +85℃ | |
| Clase de protección | IP20 | To be installed in control cabinet above IP54 |
| Vibración / Shock Resistance | 10-55Hz/1mm, 15g/11ms | Compliant with industrial environmental standards |
- Lista de accesorios & Installation Guidelines
3.1 Standard Package Contents
– PNOZ s4 safety relay main unit (750104)
– Plug-in screw terminal module (pre-installed)
– Product manual (including wiring diagram)
– Mounting clip (for DIN rail)
3.2 Accesorios opcionales
| Número de pieza. | Nombre | Función |
| 750900 | PNOZ s pIE | Positive voltage pulse extension module |
| 750910 | PNOZ s nIE | Negative voltage pulse extension module |
| 750100 | PNOZ s base | Base extension module |
| 750101 | PNOZ s cover | Protective cover |
3.3 Puntos clave de instalación
Tipo de montaje: Standard DIN 35mm rail mounting, snap-fit fixation
Método de cableado: Plug-in spring terminal; wire cross-section 0.5–2.5mm², máximo. torque 0.8Nm
Spacing Requirement: Reserve ≥5mm left/right, ≥10mm up/down for heat dissipation
Especificación de cableado: Separate safety loop and power loop wiring to avoid electromagnetic interference
- Esquema de cableado (Core Loop)
[24VDC+] ──┬─── [A1] Relay Power Positive
│
[24VDC-] ──┴─── [A2] Relay Power Negative
Emergency Stop Button (CAROLINA DEL NORTE) ── [S11] ──┬─── [S12]
│
Safety Door Contact (CAROLINA DEL NORTE) ── [S21] ──┴─── [S22]
Reset Button ──┬─── [S34] Reset Loop
│
[S33] ─────────┘
Salida de seguridad:
[13] ── [14] NO Contact 1 (Main Loop)
[23] ── [24] NO Contact 2 (Control Loop)
[33] ── [34] NO Contact 3 (Alarm Loop)
Salida auxiliar:
[41] ── [42] NC Contact (Indicación de falla)
Status Feedback:
[Y32] ── PNP Semiconductor Output (PLC Signal Input)
Nota: Select single/dual-channel mode and short-circuit detection function according to actual safety requirements.
- Funciones & Escenarios de aplicación
5.1 Funciones principales
- Dual-channel Redundant Monitoring: Dual-channel input circuit design, safely cutting off output upon fault.
- Inter-contact Short-circuit Detection: Optional function to prevent safety failure caused by contact adhesion.
- Forced Guided Contacts: Safety output contacts adopt forced guided structure to ensure reliable disconnection.
- Self-diagnosis Function: Real-time internal circuit monitoring; cut off output and indicate fault immediately when abnormal.
- Flexible Reset Mode: Support automatic reset (power-on reset) and manual reset (rising-edge trigger).
5.2 Escenarios de aplicación típicos
| Campo de aplicación | Equipo aplicable | Función de seguridad |
| Machine Tool Industry | Machining Center, CNC Lathe | Emergency stop button & safety door monitoring |
| Automated Production Line | Assembly Line, Conveyor System | Cortina de luz de seguridad, safety mat, two-hand control device |
| Robotics | Industrial Robot Workstation | Safety fence & emergency stop loop |
| Packaging Equipment | Packaging Machine, Palletizer | Protective door & safety interlock |
| Equipos de Logística | Automated Warehouse, AGV | parada de emergencia & safety sensor monitoring |
- Cross-brand Alternative Comparison Table
| Marca | Modelo | Parámetros clave | Compatibilidad | Gama de precios |
| PILZ (Original) | 750104 PNOZ s4 | 24VCC, 3NO+1NC+1SO, PL e/Cat.4/SIL 3 | 100% | 700–900 CNY |
| Schneider | XPSAC5121 | 24VCC, 3NO+1NC, PL e/Cat.4/SIL 3 | Alto | 500–700 CNY |
| siemens | 3RK3121-1AA10 | 24VCC, 3NO+1NC, PL e/Cat.4/SIL 3 | Alto | 600–800 CNY |
| Weidmüller | SRB 3024 | 24VCC, 3NO+1NC, PL e/Cat.4/SIL 3 | Medio | 400–600 CNY |
| Alternativa Doméstica | Chint NJB1-S4 | 24VCC, 3NO+1NC, PL d/Cat.3/SIL 2 | Medio | 200–300 CNY |
- Directrices de selección & Soluciones alternativas
7.1 Selection Mnemonic Rule
Voltage Matching → Contact Quantity → Safety Level → Input Type → Reset Mode → Space Limitation
7.2 Árbol de decisión de selección
- Voltaje de suministro: Confirm system is 24VDC (750104) or 48–240V AC/DC (750134 / 751134).
- Output Requirement: 3NO+1NC+1SO meets most scenarios; choose PNOZ s5 (4NO+1NC) para más contactos.
- Nivel de seguridad: PL e/Cat.4/SIL 3 is mandatory for high-risk scenarios such as heavy machinery and robotics.
- Tipo de entrada: Select IN2- mode if short-circuit detection is required; IN2+ if not needed.
- Modo de reinicio: Automatic reset for unattended occasions; manual reset for manned operation areas.
7.3 Recommended Alternative Solutions
- Budget Limited: Choose Weidmüller SRB series (rentable) or domestic Chint NJB1 series (basic safety level).
- Integración del sistema: Siemens 3RK3 series (seamless connection with S7 PLC) or Schneider XPS series (compatible with Modicon PLC).
- Expansión de funciones: Match with PNOZ s pIE / nIE pulse extension modules to realize complex safety logic.
- Space Limited: Keep PNOZ s4 (22.5mm narrow design), avoid wide-body models.
- Air Freight Compliance & Proceso de dar un título
Certificación CE: Compliant with EN ISO 13849-1, CEI 61508, CEI 62061.
Air Freight Judgment: No built-in lithium battery / supercapacitor; belongs to ordinary industrial electronic equipment, no special air freight restrictions.
Packaging Requirement: Anti-static packaging; transport temperature: -40℃ ~ +85℃.
- Troubleshooting Quick Reference
| Fenómeno de falla | Possible Cause | Solución |
| Indicador de encendido apagado | Power supply failure, wrong wiring | Check A1/A2 wiring and measure voltage |
| No Safety Output | Open input loop, reset not triggered | Check emergency stop / safety door contacts, confirm reset mode |
| No Semiconductor Output | Sobrecarga, wrong wiring | Check Y32 load (≤0.5A) and confirm PNP polarity |
| Fault Indicator Flashing | Internal self-diagnosis fault | Power off and restart, check input loop short circuit |
PNOZsigma Basic Safety Relay Series — Full Model & Número de pedido. List
| Número de pedido. | Modelo | Fuente de alimentación | Configuración de contacto |
| 750101 | PNOZ s1 | 24VCC | 2NO |
| 750102 | PNOZ s2 | 24VCC | 3NO |
| 750103 | PNOZ s3 | 24VCC | 2NO+1NC |
| 750104 | PNOZ s4 | 24VCC | 3NO+1NC |
| 750105 | PNOZ s5 | 24VCC | 4NO+1NC |
| 750106 | PNOZ s6 | 24VCC | 3NO+2NC |
| 750107 | PNOZ s7 | 24VCC | 4NO |
| 750108 | PNOZ s8 | 24VCC | 4NO+2NC |
| 751104 | PNOZ s4 C | 24VCC | 3NO+1NC (Pre-assembled spring terminal version) |
