Pilz Safety relay PNOZ s4.1 The Pilz PNOZ s4.1 (750124) is a high-performance safety relay from the PNOZsigma series. It is designed for monitoring E-stop buttons, safety gates, and light curtains. Its hallmark is its slim design (only 22.5 mm wide) and high degree of flexibility through its front-facing rotary switch. Technical Specifications Feature Specification Order Number 750124 Supply Voltage 24VDC Safety Contacts 3 N/O (Normally Open) Auxiliary Contacts 1 N/C (Normally Closed) Safety Level SIL CL 3, PLe, Cat. 4 Terminals Plug-in spring-loaded or screw terminals Operating Modes Single or dual-channel, with/without cross-fault detection Primary Input/Output Terminals A1, A2: Power supply 24VDC & 220VAC S11, S12: Input circuit Channel 1. S21, S22: Input circuit Channel 2. S34: Reset/Start button input. 13-14, 23-24, 33-34: The three N/O safety contacts that cut power to the machine when the safety circuit is broken. 41-42: The N/C auxiliary contact used for feedback to a PLC (not for safety). Common Wiring Configuration (Dual Channel) Input 1: Wire the E-Stop contact 1 between S11 and S12. Input 2: Wire the E-Stop contact 2 between S21 and S22. Start: Wire a momentary N/O push button between S11 and S34. Feedback Loop: If monitoring external contactors (EDM), wire their N/C auxiliary contacts in series with the Start button.
