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Pilz 773400-PNOZ-MI1P Safety Input Expansion Module
The Pilz 773400-PNOZ-MI1P is an 8-channel 24VDC safety digital input expansion module belonging to the PNOZmulti Classic product range. It provides I/O expansion for the PNOZmulti safety control system and supports safety functions such as emergency stop, safety gate monitoring and two-hand control. Complying with PLd per EN ISO 13849-1 and SIL CL 2 per EN/IEC 62061, it is designed for industrial automation applications requiring high-safety-level signal acquisition. This product has been discontinued, and corresponding modules from the PNOZmulti 2 series are recommended as replacements.
- Model Code Definition
| Code Segment | Definition | Detailed Description |
| 773400 | Order Code | Unique official Pilz part number for ordering and inventory management |
| PNOZ | Series Prefix | Core identifier for Pilz safety relay and safety control product line |
| MI | Module Type | Safety Digital Input Module (M-Series Input), differentiated from MO (Output) and MC (Mixed I/O) |
| 1 | Channel Spec | Standard 8-input variant (1 = 8 channels, 2 = 16 channels) |
| P | Version Code | PNOZmulti Classic edition, distinguished from Series 2 (new-generation PNOZmulti 2) |
Note: This is an expansion module for PNOZmulti Classic and must be used together with compatible base units (e.g. PNOZ m1p); standalone operation is not supported.
- Core Technical Specifications
| Category | Specification | Remarks |
| Basic Characteristics | ||
| Channel Count | 8 safety digital input channels | Configurable for single-channel or dual-channel safety circuit logic |
| Input Type | 24VDC discrete input | Complies with EN 61131-2 Type 1; compatible with PNP / NPN sensors |
| Input Polarity | Positive/Negative Logic configurable | Parameterized via PNOZmulti Configurator software |
| Input Current | Approx. 5mA per channel | Low-power design to reduce load on field sensors |
| Electrical Parameters | ||
| Operating Voltage | 20.4~28.8VDC (nominal 24VDC) | Powered from base unit via internal backplane bus |
| Input Signal Level | OFF-state: -3~+5VDC; ON-state:19.2~30VDC | Wide voltage tolerance against field supply fluctuation |
| Test Pulse Function | Built-in test pulse output | Detects short-circuit across input contacts to elevate safety integrity |
| Isolation Rating | No inter-channel isolation; isolation between module and backplane | Dielectric withstand: 250Vrms |
| Response Time | ≤10ms (factory default setup) | Fast safety reaction for emergency stop and safety interlock |
| Safety Certifications | ||
| Safety Rating | EN ISO 13849-1 PLd; EN/IEC 62061 SIL CL 2 | For medium-risk machinery safety applications |
| Approved Certificates | CE, UKCA, cULus, KOSHA, EAC (TÜV certified) | Meets global mainstream market safety compliance |
| Environmental Data | ||
| Operating Temp. | 0℃ ~ 60℃ | Standard industrial ambient range |
| Storage Temp. | -25℃ ~ 70℃ | Tolerates harsh transportation & storage conditions |
| Relative Humidity | 93%RH @40℃, non-condensing | Extended humidity resistance |
| Ingress Protection | IP20 | For cabinet indoor installation only |
| Mechanical & Mounting | ||
| Dimensions | 94(H)×22.5(W)×121(D) mm | Standard DIN rail footprint |
| Weight | ~120g (without terminals), ~138g (with terminals) | Lightweight to minimize DIN rail load |
| Mounting | Horizontal installation on 35×7.5mm EN 50022 standard DIN rail | Convenient system expansion and integration |
| Terminal Type | Optional spring-cage plug-in terminals / screw terminals | Fast field wiring and maintenance |
III. Full Product Lineup (PNOZmulti Classic Input Expansion Modules)
| Model | Channel Qty | Input Spec | Special Feature | Order No. | Lifecycle Status |
| PNOZ MI1P | 8 | 24VDC Safety DI | Standard non-coated version | 773400 | Discontinued |
| PNOZ MI1P C | 8 | 24VDC Safety DI | Conformal coated for harsh ambient | 773405 | Discontinued |
| PNOZ MI2P | 16 | 24VDC Safety DI | 16-channel extended model | 773410 | Discontinued |
| PNOZ MI2P C | 16 | 24VDC Safety DI | 16-channel coated variant | 773415 | Discontinued |
| PNOZ MI4P | 4 | 24VDC Safety DI | Compact 4-channel type | 773420 | Discontinued |
- Replacement & Cross-Brand Comparison
- Internal Pilz Alternatives
| Original PN | Replacement PN | Reason for Replacement | Compatibility Note |
| 773400-PNOZ-MI1P | 774700-PNOZ m2p mi1p | New upgrade to PNOZmulti 2 platform | Requires PNOZmulti 2 base unit + full program reconfiguration |
| 773400-PNOZ-MI1P | 774705-PNOZ m2p mi1p C | Coated version for corrosive environment | Requires PNOZmulti 2 base unit + full program reconfiguration |
| 773400-PNOZ-MI1P | 773405-PNOZ MI1P C | Conformal coating added | Drop-in compatible with original PNOZmulti Classic base unit |
- Competitor Cross Reference
| Pilz Part | Siemens Equivalent | Schneider Equivalent | Omron Equivalent | Core Differences |
| 773400-PNOZ-MI1P | 3RK1304-0CB00-0AA2 | 140SAI73400 | G9SA-501 | Pilz: Built-in safety test pulse, PLd/SIL2 |
| Siemens: PROFIsafe fieldbus, PLd/SIL3 | ||||
| Schneider: Quantum safety I/O, PLd/SIL2 | ||||
| Omron: Standalone safety relay, PLc/SIL1 |
- Application Fields & Industry Cases
- Recommended Application Scenarios
Automotive Manufacturing
Body Welding Line: Signal collection for E-stop pushbuttons, safety gate limit switches and two-hand control devices
Final Assembly Line: Connection for safety light curtains, safety mats and robot perimeter protection signals
Coating Workshop: Interlock input for explosion-proof doors and flammable gas detection alarms
Machine Tool & Machining
CNC Machine: Safe spindle stop, tool-change safety interlock and workpiece clamping confirmation signals
Press & Bending Equipment: Mould safety gate, two-hand start button and slide stroke limit monitoring
Automated Conveying Line: Conveyor safety interlock and personnel access detection
Food & Beverage / Packaging
High-speed Packaging Machine: Safety door switches, emergency stop and overload protection signals
Food Processing Line: Wash zone interlock and sterilizer safety gate status monitoring
Filling Equipment: Bottle/can in-position detection and protective door interlock
Logistics & Warehouse Automation
Automated AS/RS: Stacker crane limit switches, E-stop and walk-in access detection
Conveyor System: Line emergency stop, safety gate and overload fault input
Robotic Sorting Line: Robot cell guarding and safety light curtain signal acquisition
- Not Recommended Applications
Standalone operation: Mandatory pairing with PNOZmulti Classic base unit; cannot run independently
High safety requirement (PL e / SIL3): Select PNOZmulti 2 or higher-grade safety modules instead
Outdoor exposed installation: IP20 rated only for cabinet mounting
AC signal input: Module exclusively for 24VDC; dedicated AC input modules required for AC field signals
- Typical Application Case
Project Title: Safety Retrofit for Automotive Component Stamping Line
Bill of Material: 1×PNOZ m1p base unit + 2×PNOZ MI1P (773400) + 1×PNOZ MO1P output module + PNOZmulti Configurator
Application Benefits:
- Monitors 8 safety gate limits, 4 emergency stops and 2 two-hand control signals
- Redundant safety circuit design fulfilling EN ISO 13849-1 PLd specification
- Onboard test pulse automatically diagnoses input contact short-circuit to improve system reliability
- Integrated diagnostics cut unplanned downtime by 40% and enable rapid fault pinpointing for safety loops
- Troubleshooting Guide
| Fault Symptom | Root Cause | Inspection Steps | Remedial Action |
| Module dead, all LEDs off | 1.Base unit power failure | 1.Check base unit power LED | 1.Repair base unit power supply |
| 2.Poor backplane connection | 2.Unplug and re-seat module | 2.Fix module locking position | |
| 3.Internal hardware damage | 3.Replace with spare module | 3.Install replacement module | |
| Partial channels no input | 1.Wiring error | 1.Verify wiring against schematic | 1.Correct field wiring |
| 2.Field sensor defective | 2.Measure sensor output via multimeter | 2.Replace faulty sensor | |
| 3.Incorrect test pulse setup | 3.Check test pulse parameter in Configurator | 3.Config test pulse (only for dry contacts) | |
| 4.Burned input channel | 4.Test with known-good sensor | 4.Swap to spare channel or replace module | |
| Spurious safety trip | 1.EMI interference | 1.Check shielding & earthing | 1.Reroute cable & add shielding |
| 2.Unstable supply voltage | 2.Measure input DC 19.2~30V range | 2.Add power filter for stable supply | |
| 3.Loose terminal wiring | 3.Tighten all screw terminals | 3.Re-terminate loose wiring | |
| 4.Test pulse cross-interference | 4.Adjust/disable test pulse (for active sensors only) | 4.Optimize test pulse configuration | |
| Permanent fault LED ON | 1.Safety circuit fault | 1.Inspect safety loop wiring | 1.Remediate faulty safety wiring |
| 2.Backplane communication loss | 2.Check inter-module bus connection | 2.Restore bus connection | |
| 3.Invalid project configuration | 3.Download corrected configuration | 3.Re-program and download project |
VII. Selection Guidelines & Quick Reference
Selection Mnemonic
Eight-channel safety DI MI1P, 24VDC PNOZ expansion piece;
PLd safety grade, test pulse stops short-circuit disease;
Auto, machine, packaging cabinet-mounted IP20 lease;
Classic discontinued, upgrade to m2p series.
Quick Rules
- Model Decoding:773400 = PNOZ MI1P; PNOZ=Safety Series; MI=Input; 1=8CH; P=Classic Version
- Core Spec Shortcut:8CH /24VDC /PLd SIL2 /Built-in Test Pulse /IP20 /DIN Rail Mount
- Replacement Guide:Upgrade → PNOZmulti2; Harsh environment → Coated C version; Same platform → Classic coated spare
- Application Filter:Safety DI + Medium risk + Cabinet installation = PNOZ MI1P applicable
VIII. Ordering Information & Accessories
Standard Part No.:773400-PNOZ-MI1P (8-channel safety input module)
Conformal Coated Variant:773405-PNOZ-MI1P C
Recommended Spare Parts:
783400: PNOZmulti Spring Terminal Kit (fits MI1P/MI2P/MO1P)
793400: PNOZmulti Screw Terminal Kit (fits MI1P/MI2P/MO1P)
779110: PNOZmulti Bus Terminator (mandatory for multi-module expansion setup)
