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HIMA 984080105 Input Module
HIMA 984080105
HIMA 984080105 is a high-performance 8-channel digital (contact) input module designed by HIMA specifically for its classic H41q and H51q safety control systems. In the Safety Instrumented System (SIS), this module plays a crucial role as a “status scout”. Its core function is to reliably collect dry contact (passive contact) signals from on-site safety areas—such as the status of emergency stop buttons, pressure switches, level switches, or valve position limit switches. After photoelectric isolation and conditioning of these switching signals, it transmits them to the system’s central processing unit for safety logic judgment. As a foundational component for building redundant fault-tolerant safety systems, the HIMA 984080105 module is renowned for its exceptional reliability and robust diagnostic capabilities. It continuously monitors the health status of each input channel, accurately diagnoses short-circuit (to high voltage) and open-circuit (line break) faults in on-site wiring, and reports these fault information in real time to ensure the system always remains in a known safe state. This is critical for realizing functions that meet the SIL 3 safety integrity level, such as Emergency Shutdown (ESD), Fire and Gas Detection (F&G), and Burner Management System (BMS).
Product Parameters
- Product Model: 984080105
- Manufacturer: HIMA
- Product Type: Digital Input Module (Dry Contact Signal)
- Number of Channels: 8 Channels
- Input Type: Dry Contacts (Passive Contacts, Gold Contacts)
- Rated Input Voltage: 24 VDC (Powered by External Safety Power Supply)
- Input Current: Typical 8 mA per channel (@ 24V)
- Power Consumption: Typical 100 mA @ 5V (From Backplane)
- Response Time: < 15 ms
- Diagnostic Function: Channel-Level Short-Circuit and Open-Circuit Detection
- Operating Temperature: -40°C to +70°C
- Protection Level: Compliant with IEC 61131-2 Standard
- Safety Certification: SIL 3 (In Accordance with IEC 61508/61511)
- Installation Method: Installed via F-COMM Series Communication Base
Structure and Composition
The HIMA 984080105 module itself is an electronic function card that must be inserted into a dedicated communication base (e.g., F-COMM-A) for use. The module features a robust metal housing and a standard European-style card design, equipped with a red front operating handle. Its internal structure integrates multiple independent signal processing circuits, and each input channel adopts a high-quality photoelectric isolator—ensuring complete electrical isolation between hazardous voltages on the on-site side and logic circuits on the system side, thus effectively preventing interference and high-voltage intrusion. Each channel includes signal conditioning, filtering, and precision diagnostic circuits, which can distinguish between normal closed, normal open, short-circuit (excessive current), and open-circuit (zero current) states by monitoring loop current. The module connects to the base via gold finger connectors at the rear, drawing operating power from the base and transmitting the collected signal status and diagnostic information to the main processor through the backplane bus. The base is responsible for providing on-site terminal blocks, external power supply interfaces, and necessary fuse protection.
Key Features and Advantages
Extremely High Safety and Reliability
The core value of HIMA 984080105 lies in its compliance with SIL 3 safety level requirements. It uses high-reliability components and design, with built-in comprehensive diagnostic functions that can real-time detect short-circuit (to high voltage) and open-circuit (line break) faults in each input channel, and report fault information to the main controller immediately. This capability avoids system misoperation or failure to operate due to signal failure, ensuring the highest integrity of safety functions.
Strong Anti-Interference Capability
The input circuit of this module adopts photoelectric isolation technology with an isolation voltage of up to several thousand volts, which can effectively suppress ground potential differences and Electromagnetic Interference (EMI), ensuring the accuracy and stability of signal collection in harsh industrial environments. Specifically designed for dry contacts, it connects directly to passive switches without the need for additional signal converters, simplifying system design and wiring.
Convenient Maintenance and High Availability
The module supports online hot-swapping. When the 984080105 module needs to be replaced, maintenance personnel can directly pull out the faulty module and insert a new one without powering off or shutting down the system. The system will automatically identify and restore the configuration, minimizing unplanned downtime to the greatest extent, ensuring high availability of the production process, and significantly reducing maintenance costs.
Application Fields
The HIMA 984080105 module is widely used in process industries and safety-critical fields with strict requirements for functional safety. In the petrochemical and natural gas industry, it is a standard configuration for Emergency Shutdown Systems (ESD) and Fire and Gas Systems (F&G), used to reliably collect switching signals such as manual emergency stop buttons, gas detector alarms, and the operating status of key pumps. In the oil and gas transportation field, it is used in pipeline pressure safety protection systems to monitor the trigger status of pipeline pressure switches. In Burner Management Systems (BMS) for thermal power plants and chemical processes, the 984080105 is used to monitor the status of equipment such as flame detectors and wind speed switches, ensuring the safety of the combustion process. Additionally, it is an indispensable signal collection unit in railway interlocking systems and safety control of large mechanical equipment.
Installation and Maintenance
Pre-Installation Preparation
Before installing or replacing the HIMA 984080105 module, operators must obtain operation permission and confirm that the system is in a state allowing maintenance. Prepare a suitable base and ensure that on-site wiring is correctly connected and fastened to the base terminals. Operators must wear an anti-static wristband to prevent electrostatic discharge from damaging precision electronic components on the module. It is essential to confirm that the model label of the module is completely consistent with the required spare parts.
Maintenance Recommendations
During regular inspections, pay attention to observing whether the status indicators on the module panel display normally. It is recommended to use HIMA’s dedicated diagnostic software to check the module’s health status and channel diagnostic information regularly for preventive maintenance. When the module needs to be replaced, be sure to unlock the red front handle of the module first, then pull it out from the base smoothly. When inserting a new module, align it with the base guide rail and push it in firmly until a click is heard, ensuring the connector is fully connected. After replacing the module, confirm that its status has returned to normal in the system.
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