HIMA F3237（Order No. 984323702） is an 8-channel safety-related digital input module, specially designed for safety-critical applications such as Safety Instrumented Systems (SIS) and Emergency Shutdown Systems (ESD).It is compatible with DIN 19234 (NAMUR) proximity switches, safety proximity switches, and resistance-wired sensors.The module features built-in monitoring for short circuits and wire breaks, as well as full self-testing during operation.It complies with safety integrity levels AK 1–6 and is widely used in high-safety industrial scenarios including chemical, oil & gas, and power industries.
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Core Purpose & Applications
Safety-related 8-channel input acquisition, connecting to fail-safe sensors.Supports NAMUR standard proximity switches and resistive sensors.Monitors sensor circuit short-circuits and wire breaks in real time to ensure signal reliability.Compatible with HIMA safety control systems, suitable for high-safety applications up to SIL 2/3.Typical scenarios: emergency shutdown, safety interlocking, limit monitoring, flame/gas detection inputs.
Key Technical Parameters
| Item | Specification |
|---|---|
| Channels | 8 independent inputs |
| Sensors | NAMUR / safety proximity switches, resistive sensors |
| Supply Voltage Us | 8.2 V |
| Switching Time | Approx. 10 ms |
| 0-signal current IE | 0.35 ≤ IE ≤ 1.2 mA |
| 1-signal current IE | 2.1 ≤ IE ≤ 6.0 mA |
| Wire break threshold | ≤ 0.28 mA |
| Short-circuit threshold | ≥ 6.5 mA |
| Line impedance | ≤ 50 Ω (DIN 19234) |
| Max. cable length | ≤ 1000 m (0.5 mm²) |
| Shunt Resistor R* | 681 Ω, 1%, 0.25 W (Part No. 00 0751681) |
| Power consumption | 5 V: ~90 mA; 24 V: ~170 mA |
| Mounting width | 4 TE |
| Safety level | AK 1 … 6 |
Core Features
- Full Automatic Self-Test During OperationThe module performs continuous full-function testing during power-on and operation, covering:
- Switching on/off capability verification
- Input circuit crosstalk (zero-walk test)
- Input filter function
- Overall module function
- Sensor circuit short-circuit / wire-break detection
Note: LED status indicator functions are not included in the self-test scope.
- Circuit and Fail-Safe Design
- Independent wire-break / short-circuit monitoring for each channel with instant fault reporting
- Fail-safe design that defaults to a safe state in case of faults
- Supports single-sensor redundant wiring and cross-module redundant wiring
- Non-standard NAMUR sensors can be adapted by paralleling a 47 kΩ resistor (e.g. Pepperl+Fuchs NJ5 series).
- Wiring and Accessories
- Front cable connector: Z 7108/3237
- Cable specification: LiYY 16×0.25 mm²
- Flat pin: 2.8×0.8 mm
- 8-channel color-coded wiring for easy installation and maintenance
- Supports redundant wiring schemes to improve system availability
- Software Compatibility
- Supporting software function block: HB‑RTE‑; version subject to operating system instructions.
Typical Applications and Wiring
- Standard application: 8-channel independent connection of NAMUR proximity switches with line monitoring
- Redundant application: dual-module / dual-channel redundant wiring for single sensors
Non-standard adaptation: low-current non-NAMUR sensors with a 47 kΩ parallel resistor to increase non-load current without affecting fail-safe performance
Frequently Asked Questions (FAQ)
- Q1: Can the F3237 only be connected to NAMUR sensors?A: DIN 19234 (NAMUR) sensors are preferred. For non-standard low-current sensors, a 47 kΩ parallel resistor can be used to increase the no-load current to approximately 170 µA, while retaining wire-break monitoring.
- Q2: How to distinguish wire-break / short-circuit / normal signals?Normal 0-signal: 0.35–1.2 mANormal 1-signal: 2.1–6.0 mAWire-break: ≤ 0.28 mAShort-circuit: ≥ 6.5 mAThe module automatically identifies and reports to the system.
- Q3: What are the maximum wiring distance and wire size requirements?A: Maximum 1000 m with 0.5 mm² cable and line impedance ≤ 50 Ω. Longer distances require voltage drop and impedance verification.
- Q4: Does the module support redundancy?A: Yes. Redundant wiring is supported via single sensor connected to two modules / two channels to meet high safety and availability requirements.
- Q5: Does self-test affect normal input?A: No. Self-test runs periodically in the background without interrupting signal acquisition or introducing additional safety risks.
- Q6: Does a non-lit LED always mean the module is defective?A: Not necessarily. LED function is not covered by self-test. Please first check power supply, wiring, channel status and module fault codes.
- Q7: What is the supporting software?A: Function block HB‑RTE‑. The specific version is subject to the HIMA operating system documentation.
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