Reliable New Recision Original Safety Relay PILZ PNOZ 16SP 777070 Best Performance for Industry

The PILZ PNOZ 16SP (Order No. 777070) is a standalone safety relay designed for classic machine-safety functions where you want robust, relay-based safety logic without moving up to a full safety controller. It is commonly used to monitor emergency stop circuits, safety gate interlocks, and certain protective devices such as pressure-sensitive mats/edges, while also supporting a feedback loop (often called EDM: external device monitoring) to confirm that downstream contactors actually drop out when demanded. 

In practical terms, the PNOZ 16SP acts like a disciplined “safety bouncer” inside your control cabinet: it checks that your safety input wiring is valid (including 1- or 2-channel wiring options), enforces a stop command when a safety device opens, and only allows restart when the configured reset logic is satisfied (automatic or manual reset depending on your design and risk assessment). 

What the PNOZ 16SP Is Built to Do

1) Monitor safety inputs with common wiring architectures

The relay supports single-channel or dual-channel input wiring and can be applied with shorts-across-contacts detection in suitable configurations—useful when you want higher diagnostic coverage and better resistance to wiring faults. 

2) Provide safety-rated switching outputs plus signaling outputs

For machine enable chains, it provides 2 instantaneous safety contacts (N/O) for switching safety circuits, and it also provides 2 semiconductor outputs (often used as status/signaling outputs to a PLC input or lamp).

3) Support manual or automatic restart concepts

The unit supports automatic/manual start (reset), allowing you to design either:

• Manual reset (typical when restart could create a hazard, e.g., a guard door near moving axes), or

• Automatic reset (sometimes used when risk assessment allows and restart cannot create unexpected motion or danger). 

Key Technical Data (Order No. 777070)

Sources: PILZ eShop technical details and datasheet listing for 777070. 

Where It Fits in Real Machines

The PNOZ 16SP is a good match when your safety function is clear and bounded—like E-stop, a single safety gate, or a protective device that needs a reliable stop category behavior—and you want a proven safety relay format that is widely understood by maintenance teams.

Typical applications include:

• Emergency stop monitoring for stop category concepts (the datasheet references stop category 0) 

• Safety gate monitoring with feedback loop supervision (ensuring contactors de-energize) 

• Pressure-sensitive mat / edge monitoring in appropriate protective layouts 

It’s also commonly chosen in retrofit work because it stays close to “standard control cabinet logic”: it switches real outputs, is straightforward to document, and is serviceable without specialized software.

Design Notes That Matter (and Save Debug Time)

Use the semiconductor outputs for clear diagnostics

The two semiconductor outputs can be used as clean status signals (for example, “safety enabled” and “fault/feedback status”) into a standard PLC. This doesn’t replace safety logic in the PLC, but it does improve troubleshooting and reduces the temptation for operators to “guess” why a machine won’t start. 

Reset strategy should follow risk assessment, not convenience

Manual reset often feels annoying—right up until it prevents an unexpected restart that hurts someone. The PNOZ 16SP supports both automatic and manual reset, so you can align the behavior with the hazard scenario and your safety validation documentation. 

Wiring quality and feedback loop are not optional “nice-to-haves”

The feedback loop monitoring is there to verify downstream elements (like contactors) actually release. If a contactor welds, the safety relay should detect the inconsistency and prevent restart. That’s a major part of building a safety function with meaningful diagnostic coverage. 

Installation and Panel Integration

Mechanically, the unit is built for standard cabinet mounting with a 45 mm width and plug-in screw terminals, which helps serviceability (swap or re-terminate without fighting tiny fixed terminals). 

Environmental limits are typical for control cabinets: -10 to +55 °C, IP40 housing, and high humidity tolerance without condensation. If your cabinet runs hot (variable-speed drives, tight enclosures, poor ventilation), respecting the temperature range matters for long-term stability. 

Summary: Why Choose the PNOZ 16SP 777070

If you need a straightforward, relay-based safety relay for E-stop, safety gate, or mat/edge monitoring, the PILZ PNOZ 16SP 777070 offers a balanced combination of:

• dual supply listing (24 VAC / 24 VDC) 

• 2 N/O safety contacts plus 2 semiconductor outputs for status signaling 

• support for single/dual-channel input concepts and restart logic 

• broad acceptance with common standards and approvals 

For purchasing, commissioning, or replacement, matching the exact order number (777070) is the cleanest way to ensure you get the same supply type, output configuration, and terminal style noted above.