PILZ PNOZ S4 750104

PILZ PNOZ S4 750104

Product Overview
The PILZ PNOZ S4 750104 is a compact safety relay from the PNOZsigma series, designed to monitor emergency stop buttons, safety gates, light curtains, and other safety devices. It provides positively guided relay outputs and built-in self-monitoring to maintain safe machine shutdown when a safety circuit is interrupted. The 750104 version uses screw terminals and operates on 24 V DC supply voltage.

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Description

PILZ PNOZ S4 750104

Technical Specifications

  • Brand: PILZ
  • Series: PNOZsigma
  • Model: PNOZ S4
  • Order Number: 750104
  • Supply Voltage: 24 V DC
  • Terminal Type: Screw terminals
  • Safety Contacts: 3 instantaneous normally open contacts
  • Auxiliary Contacts: 1 instantaneous normally closed contact
  • Semiconductor Outputs: 1
  • Rated Insulation Voltage: 250 V
  • Rated Impulse Withstand Voltage: 4.00 kV
  • Pollution Degree: 2
  • Overvoltage Category: III/II
  • Width: 22.5 mm
  • Height: Approximately 96–98 mm
  • Depth: 120 mm
  • Net Weight: 190 g
  • Ambient Temperature: -10°C to +55°C
  • Protection Rating: IP40 housing, IP20 terminals, up to IP54 depending on installation
  • Approvals: EN 954-1, EN 60204-1, EN 60947-5-1, VDE 0113-1; suitable for elevator applications under EN 81-1 and the elevator directive 95/16/EC

Functional Features

  • Monitors emergency stop buttons, safety gates, light curtains, and safety switches.
  • Provides 3 positively guided safety N/O contacts and 1 auxiliary N/C contact.
  • Includes 1 semiconductor output for status feedback.
  • Supports single-channel and dual-channel safety input configurations.
  • Dual-channel mode can detect shorts across contacts.
  • Operating mode is selected via a rotary switch.
  • LED indicators show power, input channel status, output status, reset circuit, and faults.
  • Built-in redundancy and self-monitoring ensure safe operation even in the event of component failure.
  • Can be expanded with one PNOZsigma contact expansion module.

Application Scenarios

  • Emergency stop monitoring
  • Safety gate and guard monitoring
  • Light curtain and safety switch evaluation
  • Machine tool safety circuits
  • Assembly line safety interlocks
  • Elevator and lifting equipment safety monitoring
  • Conveyor system safety control
  • Industrial automation safety loops

Performance Parameters

  • Supply voltage: 24 V DC.
  • Safety contacts: 3 N/O instantaneous.
  • Auxiliary contact: 1 N/C instantaneous.
  • Semiconductor output: 1.
  • AC15 maximum current: 5.0 A.
  • DC13 maximum current at 24 V: 5.0 A.
  • Rated insulation voltage: 250 V.
  • Ambient temperature: -10°C to +55°C.
  • Module width: 22.5 mm.

Material Composition

  • Flame-retardant plastic housing
  • Positively guided safety relay contacts
  • Screw terminal blocks
  • Internal monitoring and semiconductor output circuitry
  • LED status indicators
  • Metallic contact materials with reliable switching characteristics

Structural Features

  • Compact 22.5 mm wide DIN-rail module
  • Plug-in screw terminals for easy wiring
  • Front rotary switch for mode selection
  • Six LEDs for power, input channels, output, reset, and fault indication
  • Side connector for PNOZsigma expansion modules
  • Clearly labeled terminals for A1, A2, S11, S12, S21, S22, S34, Y32, and output contacts

Working Principle
The PNOZ S4 monitors safety input channels connected to emergency stop buttons, safety gates, or light curtains. When both safety channels are closed and the start condition is satisfied, the internal safety relays energize and the three N/O safety contacts close. If a safety device is activated, a fault is detected, or supply voltage is lost, the safety contacts open immediately and disconnect the monitored load circuit. The auxiliary N/C contact and semiconductor output provide status feedback to the control system. The module continuously performs self-tests to detect internal faults and maintain safe behavior.

Installation Requirements

  • Mount on a 35 mm DIN rail inside a control cabinet.
  • Use 24 V DC supply voltage for order number 750104.
  • Connect safety devices to channels S11/S12 and S21/S22 according to the required single-channel or dual-channel configuration.
  • Connect the reset/start circuit to terminal S34.
  • Wire safety outputs 13-14, 23-24, and 33-34 to the monitored contactors or safety loads.
  • Keep safety wiring separate from high-voltage power circuits.
  • Select the operating mode using the front rotary switch before commissioning.
  • Verify LED indicators after power-up and after each safety device actuation.

Precautions for Use

  • The 750104 model uses screw terminals and must not be confused with 751104, which uses spring-cage terminals.
  • Do not bypass safety contacts or disable self-monitoring functions.
  • Ensure the reset mode matches the application requirements.
  • Check LED fault indications before restarting the machine.
  • Do not exceed the rated contact current or insulation voltage.
  • Perform regular functional tests of emergency stop and safety gate circuits.
  • Replace the module only with the correct PILZ order number and supply voltage.
  • Refer to the official PILZ PNOZ S4 operating manual for wiring diagrams and safety validation.

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