F3237 | HIMA | F 3237 | 8-Fold Input Module

The HIMA F 3237 is an 8-fold input module designed for safety-related applications. It connects safety-related proximity switches, proximity switches according to DIN 19234 (NAMUR), and resistor-wired sensors. It also monitors the lines for short circuits and wire breaks, ensuring reliable operation in safety-critical environments.

• Safety-related: Requirement class AK 1 … 6
• Automatic Testing: The module is completely tested during operation, including:
  • Switch-on and switch-off capability
  • Crosstalk of input circuits (walking-zero test)
  • Input filter function
  • Module functionality
  • Short circuit and wire break detection
• LED Functionality: Not tested during the automatic testing process.

Key Specifications:

• Switching Time: Approx. 10 ms
• Operating Points (IE):
  • 0 signal: 0.35 ≤ IE ≤ 1.2 mA
  • 1 signal: 2.1 ≤ IE ≤ 6.0 mA
  • Wire Break: ≤ 0.28 mA
  • Short Circuit: ≥ 6.5 mA
• Line Impedance: ≤ 50 Ohm (according to DIN 19234)
• Line Length: ≤ 1000 m (Ø = 0.5 mm²)
• Supply Voltage (US): 8.2 V
• *Shunt Resistor (R)**: 681 Ohm, 1%, 0.25 W (R17 … R24, part number 00 0751681)
• Space Requirement: 4 TE
• Operating Data:
  • 5 V: 90 mA
  • 24 V: 170 mA

Notes on Non-DIN 19234 Proximity Switches:

• Proximity switches outside the DIN 19234 standard may not work properly with the F 3237 module, especially switches like the NJ 5 – 30GK – S1N (P&F company), which produces low current in the non-damped state. This can affect the wire break supervision.
• To resolve this, you can add a 47 kΩ resistor in parallel to increase the output current to 170 µA in the non-damped state. This ensures correct functionality, and a resistor break will be signaled as a line break, as would a real line break.

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