PILZ Safety Relay 750104 PNOZ s4

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, safety door and safety light curtain.

1. Model Segment Definition

2. Core Specification Parameter Table

3. Accessory List & 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 Optional Accessories

3.3 Installation Key Points

Mounting Type: Standard DIN 35mm rail mounting, snap-fit fixation

Wiring Method: Plug-in spring terminal; wire cross-section 0.5–2.5mm², max. torque 0.8Nm

Spacing Requirement: Reserve ≥5mm left/right, ≥10mm up/down for heat dissipation

Wiring Specification: Separate safety loop and power loop wiring to avoid electromagnetic interference

4. Wiring Schematic (Core Loop)

[24VDC+] ──┬─── [A1] Relay Power Positive

│

[24VDC-] ──┴─── [A2] Relay Power Negative

Emergency Stop Button (NC) ── [S11] ──┬─── [S12]

│

Safety Door Contact (NC) ── [S21] ──┴─── [S22]

Reset Button ──┬─── [S34] Reset Loop

│

[S33] ─────────┘

Safety Output:

[13] ── [14] NO Contact 1 (Main Loop)

[23] ── [24] NO Contact 2 (Control Loop)

[33] ── [34] NO Contact 3 (Alarm Loop)

Auxiliary Output:

[41] ── [42] NC Contact (Fault Indication)

Status Feedback:

[Y32] ── PNP Semiconductor Output (PLC Signal Input)

Note: Select single/dual-channel mode and short-circuit detection function according to actual safety requirements.

5. Functions & Application Scenarios

5.1 Core Functions

1. Dual-channel Redundant Monitoring: Dual-channel input circuit design, safely cutting off output upon fault.
2. Inter-contact Short-circuit Detection: Optional function to prevent safety failure caused by contact adhesion.
3. Forced Guided Contacts: Safety output contacts adopt forced guided structure to ensure reliable disconnection.
4. Self-diagnosis Function: Real-time internal circuit monitoring; cut off output and indicate fault immediately when abnormal.
5. Flexible Reset Mode: Support automatic reset (power-on reset) and manual reset (rising-edge trigger).

5.2 Typical Application Scenarios

6. Cross-brand Alternative Comparison Table

7. Selection Guidelines & Alternative Solutions

7.1 Selection Mnemonic Rule

Voltage Matching → Contact Quantity → Safety Level → Input Type → Reset Mode → Space Limitation

7.2 Selection Decision Tree

1. Supply Voltage: Confirm system is 24VDC (750104) or 48–240V AC/DC (750134 / 751134).
2. Output Requirement: 3NO+1NC+1SO meets most scenarios; choose PNOZ s5 (4NO+1NC) for more contacts.
3. Safety Level: PL e/Cat.4/SIL 3 is mandatory for high-risk scenarios such as heavy machinery and robotics.
4. Input Type: Select IN2- mode if short-circuit detection is required; IN2+ if not needed.
5. Reset Mode: Automatic reset for unattended occasions; manual reset for manned operation areas.

7.3 Recommended Alternative Solutions

1. Budget Limited: Choose Weidmüller SRB series (cost-effective) or domestic Chint NJB1 series (basic safety level).
2. System Integration: Siemens 3RK3 series (seamless connection with S7 PLC) or Schneider XPS series (compatible with Modicon PLC).
3. Function Expansion: Match with PNOZ s pIE / nIE pulse extension modules to realize complex safety logic.
4. Space Limited: Keep PNOZ s4 (22.5mm narrow design), avoid wide-body models.
5. Air Freight Compliance & Certification

CE Certification: Compliant with EN ISO 13849-1, IEC 61508, IEC 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℃.

9. Troubleshooting Quick Reference

PNOZsigma Basic Safety Relay Series — Full Model & Order No. List