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Pilz PSS SB DI80Z4
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Phoenix Contact PSR-SPP-24UC/URM4/5X1/2X2/B
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Celesco PT801-0005-611-111
Celesco PT801-0005-611-111

Pilz PSS SB DI80Z4

Product Introduction:
The 301121 (commonly referenced alongside 301120) is a decentralized safety I/O circuit for the Pilz PSSuniversal / SafetyBUS p network. It provides 8 safe digital inputs and 8 digital outputs (4 positive-switching, 4 negative-switching) with integrated test pulse diagnostics.
Category:
Description
Technical Specifications:
  • Part No.:​ 301121 / 301120 family
  • Inputs:​ 8 × 24 V DC safety inputs (single/dual channel)
  • Input Current:​ ~7 mA per channel
  • Voltage Range:​ 20.4–28.8 V DC
  • Outputs:​ 4 × positive switching, 4 × negative switching
  • Output Load:​ Max 2 A resistive/inductive
  • Bus Interface:​ SafetyBUS p
  • Safety Level:​ SIL 3 (IEC 61508), PL e (ISO 13849-1)
  • Diagnostics:​ Cross-short, wire break, test pulse, power fail
  • Temp Range:​ 0 °C to +55 °C
  • Protection:​ IP20 (cabinet mount)
  • Mounting:​ DIN rail
Functional Features:
  • Pulse-test output for short-to-ground detection
  • Logical grouping of I/O on SafetyBUS p (up to 2 groups)
  • Per-channel status LED
  • Hot-swappable in configured systems
  • PAS4000 engineering tool integration
Working Principle:
Each input channel evaluates sensor states using dual-channel redundancy. The module injects periodic test pulses to detect wiring faults. Outputs are driven through positive/negative switching pairs to safely de-energize actuators upon safety event.
Application Scenarios:
  • Automotive weld cell safety doors
  • Robot cage interlock collection
  • Packaging machine guard switches
  • Press brake light curtain interfacing
Installation Requirements:
  • Install inside control cabinet
  • Terminate 24 V DC supply with proper fusing
  • Assign SafetyBUS p node address via dip-switch or software
Usage Notes:
  • Negative-switching outputs must pair with positive outputs
  • Do not connect 230 V AC loads
  • Use only with approved Pilz safety controllers
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