PILZ PNOZ 11 Safety Relay Modules: 774086

Technical Dossier

Product Details And Specifications

PILZ PNOZ Series: Comprehensive Module Range and Technical Overview

The PILZ PNOZ series is one of the most widely deployed safety relay families in global heavy industry. Installed across chemical processing plants, nuclear power facilities, oil refineries, offshore platforms, and automotive assembly lines, PNOZ modules serve as the backbone of machine safety and emergency stop (E-stop) circuits worldwide. The series covers functional safety categories up to PL e / SIL 3 per EN ISO 13849-1 and IEC 62061, making it a reference standard for safety-critical control architectures. PILZ, headquartered in Ostfildern, Germany, has manufactured the PNOZ range since the 1980s, and the installed base across legacy and modern facilities remains extensive.

The Evolution of PNOZ Architecture

The PNOZ product line has undergone four distinct architectural generations since its introduction. The original PNOZ 1 through PNOZ 11 family (1980s–2000s) established the electromechanical forced-guided relay topology that became an IEC 60947-5-1 industry benchmark. These units operate on fixed-function logic: a single-channel or dual-channel input monitors E-stop buttons, light curtains, or door interlock switches, and the output relay contacts open in a de-energize-to-trip sequence.

The second generation introduced the PNOZmulti configurable safety controller platform, allowing multi-function logic to replace banks of discrete PNOZ relays. The third generation, PNOZmulti 2, extended the backplane bus architecture with modular I/O expansion and integrated diagnostics via the PNOZmulti Configurator software tool. The current generation, PNOZsigma and myPNOZ, supports modular assembly with shared power supply rails and tool-free wiring. Compatibility between generations is not automatic: PNOZ 1–11 units use DIN rail mounting with screw terminals and are not electrically interchangeable with PNOZmulti backplane slots. Facilities maintaining legacy PNOZ 1–11 installations must source original-series replacements or perform a full safety circuit redesign to migrate to PNOZmulti.

PNOZ Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models across the PNOZ 1–11 classic series and the PNOZmulti/PNOZmulti 2 expansion range. Each entry reflects the module's primary functional classification.

Classic PNOZ 1–11 Series (Fixed-Function Safety Relays)

• 774086 PNOZ 11: 24 VDC/AC E-stop safety relay, 3 N/O + 1 N/C output contacts, single/dual-channel input, manual or automatic reset
• 774060 PNOZ 1: 24 VDC E-stop relay, 3 N/O + 1 N/C, foundational single-channel unit for basic machine guarding
• 774061 PNOZ 2: 24 VDC/AC dual-channel E-stop relay, 3 N/O + 1 N/C, cross-circuit monitoring
• 774063 PNOZ 3: 24 VDC two-hand control safety relay, 2 N/O output contacts, Category 4 per EN 574
• 774064 PNOZ 4: 24 VDC light curtain / safety mat interface relay, 2 N/O + 1 N/C
• 774065 PNOZ 5: 24 VDC door/guard monitoring relay, 3 N/O + 1 N/C, magnetic switch compatible
• 774066 PNOZ 6: 24 VDC/AC E-stop relay with time-delayed output, adjustable 0.1–3 s delay
• 774067 PNOZ 7: 24 VDC speed/standstill monitoring relay, zero-speed detection for rotating machinery
• 774068 PNOZ 8: 24 VDC muting relay for light curtain bypass during material feed cycles
• 774070 PNOZ 10: 115/230 VAC E-stop relay, 3 N/O + 1 N/C, for high-voltage control panel integration
• 774585 PNOZ X2.8P: 24 VDC/AC E-stop relay, spring-clamp terminals, 3 N/O + 1 N/C, compact 22.5 mm housing
• 774590 PNOZ X3: 24 VDC/AC E-stop and safety gate relay, 3 N/O + 1 N/C, dual-channel, Category 4
• 774596 PNOZ X5: 24 VDC/AC light curtain interface, 2 N/O + 1 N/C, OSSD input compatible
• 774601 PNOZ X7: 24 VDC standstill/underspeed monitor, 1 N/O + 1 N/C, encoder or proximity input

PNOZmulti / PNOZmulti 2 Configurable Safety Controllers

• 773100 PNOZ m B0: PNOZmulti 2 base unit, 24 VDC, 20 safe inputs, 4 safe semiconductor outputs, USB configuration port
• 773101 PNOZ m B1: PNOZmulti 2 base unit with 8 safe relay outputs, for high-current load switching applications
• 773530 PNOZ mo0p: PNOZmulti output expansion module, 4 safe relay outputs, backplane bus connection
• 773540 PNOZ mi1p: PNOZmulti input expansion module, 8 safe digital inputs, for distributed sensor arrays
• 773550 PNOZ mc0p: PNOZmulti communication module, Profibus DP interface for DCS/SCADA integration
• 773560 PNOZ mc1p: PNOZmulti communication module, Profinet IO interface, real-time Ethernet safety data

Sourcing Hard-to-Find & Obsolete PNOZ Parts

The classic PNOZ 1–11 series entered end-of-life status progressively from 2010 onward, with PILZ officially discontinuing several base models by 2018. However, the installed base in chemical plants, nuclear facilities, and legacy automotive lines remains active, and replacement demand persists across MRO (Maintenance, Repair & Operations) procurement channels.

Quality Control for the PNOZ Range

PNOZ classic series modules incorporate forced-guided (mechanically linked) relay contacts, a design feature that must be verified during incoming inspection. DriveKNMS applies the following test protocol to all PNOZ units processed through its facility:

• Contact continuity test: Each N/O and N/C contact is verified for resistance <100 mΩ in the closed state using a four-wire Kelvin measurement.
• Forced-guidance integrity check: Relay coil is energized and de-energized 50 cycles; contact state is confirmed to be mutually exclusive between N/O and N/C positions at each transition.
• Coil voltage tolerance test: Supply voltage is swept from 85% to 110% of rated voltage; relay must operate within specified pick-up and drop-out thresholds.
• Insulation resistance test: 500 VDC applied between contact circuits and coil circuit; insulation resistance must exceed 100 MΩ.
• Functional reset verification: Both manual reset and automatic reset modes are exercised to confirm correct output sequencing per PILZ datasheet specifications.

Units that fail any single test parameter are quarantined and not returned to inventory. Test records are retained for a minimum of five years and are available to customers upon request.