PNOZ-X2.8P-777301 PILZ Safety Relay

PNOZ-X2.8P-777301-CIUPERCĂ is the most widely used dual-channel safety relay from Pilz’s PNOZ X product line. Its core advantages cover wide 24V AC/DC operating voltage, 3NO+1NC contact configuration, high safety rating of SIL 3 / PL e, and ultra-fast response within ≤50ms. It is extensively deployed for various industrial safety monitoring applications. Thanks to hardwired design, it delivers superior reliability over software-based solutions under high-vibration and severe EMI conditions, making it an optimal choice for industrial automation safety protection.

Defalcarea codului de model

Segment de cod	Definiţie	Descriere detaliată
PNOZ	Product series prefix	Identifier for Pilz core safety relay product range
X	Cod de serie	Basic standalone safety relay of PNOZ X series, operable without extension modules
2.8	Functional code	“2” stands for dual-channel monitoring; “8” denotes automatic / monitored start mode with 3 safety outputs plus 1 auxiliary output
P	Tip de terminare	Screw terminal version; Push-in indicates spring-cage pluggable terminals, unmarked for standard terminals
777301	Order number	Unique global part number for purchasing and inventory management
CIUPERCĂ	Brand name	Pilz GmbH & Co. KG, Germania

Specificații tehnice de bază

Categoria parametrilor	Caietul de sarcini	Observații
General Data
Tip de produs	Dual-channel safety relay	Conform cu EN ISO 13849-1 (PL e) & ÎN 62061 (SIL 3)
Aprovizionare evaluată	24V AC/DC (±15%)	Wide-range input compatible with standard industrial power supplies
Dimensiune	94×22.5×121mm (H×L×D)	22.5mm standard width for compact cabinet layout
Montare	35mm șină DIN (ÎN 60715)	Instalare verticală, cuplul de strângere: 0.5~0.8Nm
Caracteristici de intrare
Input Circuits	2 independent dual-channel inputs (S11-S12/S52, S21-S22)	24În DC, 30mA input, compatible with PNP sensors
Input Function	Optional cross-contact short-circuit detection	Enabled by short-circuiting S11-S12; disabled by short-circuiting S21-S22
Caracteristici de ieșire
Ieșiri de siguranță	3 Deschis normal (NU) contacts with redundant dual-contact series design	Redundant structure for guaranteed safe cut-off
Ieșire auxiliară	1 În mod normal închis (NC) contact	Doar pentru indicarea stării, NOT permitted in safety circuits
Evaluarea contactului	AC1:240V/6A; DC1:24V/6A	AgCuNi silver-copper-nickel contact material for arc oxidation resistance
Evaluarea contactului	AC15:230V/5A; DC13:24V/5A
Parametri de performanță
Timp de răspuns	≤50ms (input to output); reset time ≤100ms	Fast safety cut-off for high-speed machinery
Consumul de energie	Max.100mA	Low-power design for energy saving
Temperatura ambiantă	Operațiunea: -10°C ~ +55°C; Depozitare: -35°C ~ +70°C	Suitable for harsh industrial ambient conditions
Protecție la intrare	IP20 (corpul principal), IP40 (terminal area)	Must be installed inside control cabinet ≥IP54
Certificari	CE, CCC, UL, RoHS	Global market access certifications

III. Full Range Model List (Core PNOZ X2 Series)

Model	Comanda nr.	Tensiune de alimentare	Configurare ieșire	Start Mode	Tip terminal
PNOZ X2.8P	777301	24V AC/DC	3NU+1NC	Automat / Monitored	Şurub
PNOZ X2.8	777300	24V AC/DC	3NU+1NC	Automat / Monitored	Standard
PNOZ X2.8P PI	777302	24V AC/DC	3NU+1NC	Automat / Monitored	Plug-in
PNOZ X2.7P	777311	24~240V AC/DC	3NU+1NC	Automat / Monitored	Şurub
PNOZ X2.7	777310	24~240V AC/DC	3NU+1NC	Automat / Monitored	Standard
PNOZ X2.10P	777321	24În DC	2NU+1NC	Resetare manuală	Şurub
PNOZ X2.11P	777331	24În DC	3NU+1NC	Resetare manuală	Şurub

Cross-Brand Equivalent Replacement Table

Marca	Alternative Part	Diferențele cheie	Domeniul de aplicare
Schneider	Se caută SR2B121BD	Cu un singur canal, 2NU+1NC, 24VDC only	Low-risk applications with limited budget
Siemens	3SK1111-1AB30	Canal dublu,3NU+1NC,24V AC/DC	Full drop-in replacement, SIL3 compliant
Omron	G9SA-321-T075	Canal dublu,3NU+1NC,24V AC/DC	Matched for Japanese-built equipment, rentabil
ABB	MSR125TP	Canal dublu,3NU+1NC,24V AC/DC	Heavy-duty machinery with superior anti-vibration performance
Pilz Upgrade	PNOZ X2.7P (777311)	Tensiune largă:24~240V AC/DC	Global projects with varying supply voltages

Mediul de aplicare & Cazuri industriale

Aplicații recomandate

Machinery Safety Monitoring: Emergency stop pushbuttons, safety door interlocks, safety light curtains, two-hand control stations
Producție de automobile: Welding robots, coating production lines, lithium battery equipment interlock control
Electronics Assembly: SMT placement machines, AOI inspection equipment, laser cutter safety circuits
Mașini de ambalare: High-speed packaging lines, palletizing robots, over-temperature protection for heat-sealing devices
Logistics Automation: Stacker cranes, AGVs, conveyor safety door & E-stop systems

Aplicații nerecomandate

Safety systems requiring complex logic operations (PNOZmulti modular safety controller recommended)

Extreme high-vibration environments (>10g): extra vibration dampening required

Unprotected outdoor mounting (only IP20 body protection)

Cazuri tipice de aplicare

Case1: Lithium Battery Aging Room Safety Control for Automotive Industry

Funcții: Access door interlock, emergency cut-off on over-temperature, fire protection linkage

Configurare: PNOZ X2.8P(777301)+safety door switch+temperature sensor+E-stop button

Rezultat: PL e safety level achieved to prevent thermal runaway of lithium cells

Case2: Safety Circuit Retrofit for Laser Cutting Machine

Original Issue: Distributed safety PLC I/O triggered false shutdown twice in three years due to EMI interference

Soluţie: Replace with hardwired safety circuit using PNOZ X2.8P

Rezultat: Zero breakdown over 5 ani, response optimized ≤50ms, costul de întreținere redus cu 60%

Sfaturi de selecție & Quick Reference Rules

Quick Selection Formula

24V AC/DC X2.8, dual-channel with three NO & one NC<br>

Screw terminal 777301, automatic start with top safety grade<br>

Opri, perdea luminoasă & usa de siguranta, certified SIL3 & PL e<br>

DIN rail mounting saves cabinet space, fits all industrial sites

Quick Reference Rules

Model Memorization: PNOZ X2.8P = Dual-channel + Mode8 + P=screw terminals
Cod de comandă:777301 = standard baseline part of Pilz X2 family
Core Specs:24V AC/DC,3NU+1NC,≤50ms response,SIL3/PL e
Terminal Wiring Rules:

Short S11-S12: Activate contact short-circuit detection

Short S21-S22: Deactivate contact short-circuit detection

Short S12-S34: Enable automatic start mode

Short S52-S11: Enable automatic reset function

VII. Instalare & Ghid de întreținere

Specificații de instalare

Mount vertically inside control cabinet with terminals facing upward for natural convection cooling
Maintain ≥50mm clearance from heat-generating components, ≥30mm from cabinet inner walls
Separate wiring of safety circuits and power circuits; route crossing wires at 90° to reduce EMI coupling
Install 10A fuse in series ahead of output contacts for contact protection

Common Troubleshooting Guide

Fenomen de eroare	Root Cause	Remedial Action
Power indicator off	1. No power supply or reversed polarity	1. Verify A1/A2 wiring
Power indicator off	2. Input voltage out of tolerance	2. Confirm stable 24V AC/DC supply
Safety outputs fail to close	1. Open input circuit	1. Check continuity of S11-S12/S21-S22
Safety outputs fail to close	2. Incorrect start circuit configuration	2. Confirm jumper status of S12-S34
Contact ablation/burning	1. Overloaded output rating	1. Upgrade to higher-rated relay
Contact ablation/burning	2. Missing snubber for inductive loads	2. Fit freewheeling diode(DC) or varistor(AC) in parallel
Unexpected false tripping	1. Electromagnetic interference on input lines	1. Apply shielded cable with proper grounding
Unexpected false tripping	2. Misconfigured short-circuit detection	2. Adjust S11-S12/S21-S22 jumper setup