Description
Product Introduction
The F3237 is an 8-fold input module for safety applications. It connects safety related proximity switches and resistor-wired sensors. This module supports NAMUR switches per DIN 19234. It monitors lines for short-circuit and wire break. The module meets requirement class AK 1 to 6. Automatic self-test runs during operation. LEDs are not tested, but all core functions are verified. The corresponding software block is HB-RTE-. Check the OS description for the latest version.
Key Features
- 8 input channels for NAMUR or resistor-wired sensors
- Safety class AK 1 … 6 for fail-safe circuits
- Automatic full module test during operation
- Walking zero test checks crosstalk between inputs
- Tests input filters and switching capability
- Detects sensor line short circuit and wire break
- Switching time: approx. 10 ms
- Line monitoring threshold: wire break ≤ 0.28 mA / short circuit ≥ 6.5 mA
- Line impedance ≤ 50 Ohm (per DIN 19234)
- Max line length: 1000 m with 0.5 mm² wire
- Supply voltage: 8.2 V per channel
- Shunt resistor: 681 Ohm, 1%, 0.25 W
Technical Specifications
- Brand: PLCDCS HUB
- Model: F3237
- Type: 8-channel safety related input module
- Input signal 0: 0.35 mA to 1.2 mA
- Input signal 1: 2.1 mA to 6.0 mA
- Wire break threshold: ≤ 0.28 mA
- Short circuit threshold: ≥ 6.5 mA
- Power supply (5 V): 90 mA
- Power supply (24 V): 170 mA
- Space requirement: 4 TE
- Shunt resistor P/N: 00 0751681 (681 Ohm, 1%, 0.25 W)
- Operating temperature: Standard industrial range
- EMC immunity: Designed for noisy industrial environments
Compatibility Note
- Some sensors do not follow DIN 19234, e.g., NJ 5 – 30GK – S1N from P&F.
- This sensor gives very low current in non-damped state.
- Low current affects line break supervision.
- Solution: Add a 47 kOhm resistor in parallel to boost output to 170 µA.
- Resistor failure acts like a line break.
- Real line break detection still works normally.
- No limits for fail-safe circuit use.
Diagnostic Capabilities
- Full automatic test during operation
- Detects short circuit on sensor lines (≥ 6.5 mA)
- Detects wire break on sensor lines (≤ 0.28 mA)
- Walking zero test finds crosstalk faults
- Verifies input filters are working
- Checks module switching function
- LED status not tested
Installation & Maintenance
- Space required: 4 TE on DIN rail
- Use shielded cable for long runs > 500 m
- Maintenance: no regular calibration needed
- Self-diagnostics reduce manual checks
- Easy swap of faulty module
Typical Applications
- Emergency stop monitoring
- Door or guard switch detection
- Rotary encoder proximity sensing
- Position monitoring in fail-safe systems
- Process automation up to AK 6
- Lines up to 1000 m in factories
Packaging & Delivery
- One F3237 module
- Shunt resistors (8 pcs, 681 Ohm, 1%)
- Quick start guide
- 12-month warranty from purchase date
- Shipping: FedEx, UPS, DHL express available
Certifications
- Safety requirement class AK 1-6
- Meets DIN 19234 (NAMUR)
- Suitable for fail-safe circuits per industry standards
FAQ
- Can I use non-NAMUR sensors? Yes, but check current levels. Add 47 kOhm resistor if needed.
- What happens if the parallel resistor fails? Module detects it as wire break. Safety remains intact.
- Does the module test LEDs? No. LED function is not tested automatically.
- What is the real switching speed? About 10 ms. Fast enough for most safety loops.
- How do I know which software block to use? Use HB-RTE-. Confirm version with OS manual.
- Can I extend cable beyond 1000 m? Not recommended. Use thicker wire or repeaters.
- What is typical current in non-damped state? Some sensors give < 0.28 mA. Add 47 kOhm resistor to fix.
- Which resistor value works best for low-current sensors? 47 kOhm is proven. Use metal film type for reliability.
- How to choose between F3237 and other modules? Pick F3237 for 8 channels, NAMUR, and AK up to 6. Check your sensor’s off-state current first.
Selection Guide
- Check your sensor’s off-state current. Must be > 0.28 mA.
- If current < 0.28 mA, add 47 kOhm resistor in parallel.
- Use shielded cable for runs over 500 m.
- Confirm safety class AK matches your system.
- Need faster than 10 ms? Consider other modules.
- For 11 mm Proximity Probes, see 3300 XL 11 mm Proximity Probes.
Contact & Support
- For inquiries: +86 158 8020 0923 (WhatsApp)
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Original Source: https://plcdcshub.com/
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