New Recision Original Safety Relay PILZ PNOZ 16SP 777076 Good Performance for Industrial Control

The Pilz PNOZ 16SP (Order No. 777076) is a standalone safety relay built for classic machine-safety tasks where you want a hard-wired, deterministic safety function without the complexity of a programmable safety controller. In practical terms, it’s the kind of module you drop into a control panel when you need reliable monitoring of emergency stop devices, safety gates, and a feedback loop (EDM)—and you want the outputs to switch power contactors or safety circuits in a clean, standards-aligned way.

What makes this specific variant notable is the dual supply concept: it supports 230 VAC (U1) and 24 VDC (U2), which is useful in panels where mains is available for the relay’s supply while the control logic and signaling remain in 24 VDC land. 
It also supports 1- or 2-channel wiring and can be configured with or without shorts-across-contacts detection, helping you match the relay to the risk assessment and wiring philosophy of the machine. 

Key Specifications (PNOZ 16SP 777076)

Technical details above are taken from the Pilz product listing for 777076.

How It Works in a Real Safety Circuit

A safety relay like the PNOZ 16SP acts as the decision gatekeeper between a safety input device (for example an E-stop button or safety gate switch) and the machine’s power-controlling elements (often force-guided contactors). The module monitors the input circuit and—when conditions are correct—energizes its internal safety outputs (here, two normally-open safety contacts) to allow motion or power. When a hazardous condition is detected (E-stop pressed, gate opened, wiring fault detected, feedback loop indicates welded contactor, etc.), it drops the safety outputs and the machine transitions to a safe state consistent with the application. 

This unit supports:

• Single-channel or dual-channel input wiring, so you can implement simpler circuits or higher-diagnostic architectures depending on your safety requirement. 

• Optional detection of shorts across contacts, which is especially relevant when cables are routed in harsh environments or where wiring damage is a realistic fault scenario. 

• Automatic or manual start/reset, letting you choose between immediate restart behavior versus requiring deliberate operator acknowledgment after a safety event. 

• A feedback loop (EDM) function so the relay can verify external switching elements returned to a safe, de-energized state before allowing restart. 

The presence of two semiconductor outputs (SC) is handy when you want to feed status back to a standard PLC input (non-safety), stack light, or HMI message—without consuming your safety contacts for diagnostics. 

Standards, Compliance, and What “Safety” Really Means

Pilz positions this relay for use in safety-relevant machinery control circuits, and the technical documentation commonly references machinery and functional-safety standards such as EN 60204-1, EN 62061, and EN ISO 13849-1. 
That said, a key point (and it matters in audits) is: the safety level of your final machine safety function is not “guaranteed by the relay alone.” It depends on the entire safety chain—device selection, wiring architecture, diagnostics, contactor feedback, fault exclusions, and your risk assessment.

So the correct engineering approach is:

1. Do the risk assessment.

2. Choose the architecture (single/dual channel, reset mode, fault detection).

3. Validate the achieved PL/SIL for the complete safety function.

4. Commission and document the proof tests and inspection intervals.

Typical Applications

Because the PNOZ 16SP supports both E-stop / safety gate monitoring and a feedback loop, it fits well in machines such as:

• Packaging machines with guard doors where restart must be controlled

• Small conveyor zones with E-stop circuits and contactor monitoring

• Assembly fixtures where access doors need interlocking and reset logic

• Pressurized or wet areas (installed inside an IP-rated cabinet) where wiring integrity is a concern

• Installations involving pressure-sensitive mats, given the listed input characteristic (80 Ω) for mat monitoring contexts 

Integration Notes (Practical, Not Theoretical)

1. Use the safety contacts for safety power switching, not for “status.” Reserve signaling to the semiconductor outputs where possible. 

2. Respect utilization categories (AC-15/DC-13, etc.). Ratings differ dramatically between resistive and inductive loads. If you’re driving contactor coils, check the appropriate category and derating; the technical data references AC-15 at 230 V / 5 A, and datasheets commonly list DC-13 ratings separately. 

3. Design the feedback loop (EDM) honestly. If you use external contactors, wire the feedback so welded contacts are actually detectable before restart is permitted. 

4. Plan for serviceability. The plug-in screw terminals and 45 mm width make replacement straightforward in dense panels, which is useful for downtime control. 

Summary

The Pilz PNOZ 16SP 777076 is a compact, panel-friendly safety relay that delivers a clean combination of 2 N/O safety contacts + 2 semiconductor signaling outputs, supports single- or dual-channel safety inputs, offers automatic/manual restart behavior, and includes the essentials for E-stop, safety gate, and EDM feedback loop monitoring. 
For machine builders who want a proven, standards-referenced safety building block—especially in mixed-voltage panels where 230 VAC and 24 VDC both exist—this module is a solid, disciplined choice.