Product Description
I. Product Overview
The Allen-Bradley 1771-IXHR module is a high-performance and high-reliability DC digital input module in the PLC-5 series, specially designed for the accurate collection of high-requirement DC digital signals in industrial automation systems. In critical industrial production scenarios, such as safety interlocking of heavy machinery and equipment, status monitoring of high-precision production lines, and equipment signal feedback in extreme environments, modules need to have higher stability and anti-interference capabilities. With its enhanced hardware design and optimized signal processing mechanism, the 1771-IXHR module can reliably collect DC digital signals in complex and harsh industrial environments and accurately transmit them to the PLC controller, providing key data support for the safe and stable operation of industrial systems.
The module adopts a reinforced compact structure, which is perfectly compatible with the 1771 series I/O enclosures and can be easily installed in various industrial control cabinets, effectively saving installation space. The shell is made of high-strength and corrosion-resistant industrial-grade alloy material, which has passed strict military-grade environmental tests and has excellent anti-vibration and anti-impact performance. It can maintain stable work in industrial sites with severe vibration of heavy machinery and high equipment operation intensity. At the same time, the surface of the shell has undergone multiple layers of special protection process treatment, with super strong dust-proof, moisture-proof, oil-proof and anti-chemical corrosion capabilities. It can adapt to extreme industrial environments with much dust, humidity, serious oil stains and possible corrosive gases, ensuring long-term and reliable completion of signal collection tasks.
II. Performance Parameters
(1) Electrical Characteristics
Power Requirement: The working power of the 1771-IXHR module comes from the backplane of the 1771 I/O enclosure, requiring two types of power supplies: +5V DC and +24V DC. Among them, +5V DC supplies power to the high-precision logic circuit inside the module, with typical current consumption in a specific range and high requirements for power supply stability; +24V DC, as an auxiliary power supply for external sensors, has high current output capability and stability, which can provide reliable power supply support for multiple groups of DC sensors and simplify the complexity of system wiring.
Input Channels: The module is equipped with 16 independent high-reliability DC digital input channels, each of which adopts an independent signal processing circuit. It can collect 16 DC digital signals at the same time, meeting the needs of industrial control systems with extremely high requirements for signal collection reliability and ensuring that key signals are not lost or misjudged.
Input Signal Types: It supports a wide range of DC input signals, with an input voltage range usually of 10-30V DC. It is compatible with various high-precision DC sensors with NPN and PNP outputs, and can be directly connected to multiple high-reliability DC digital devices such as high-performance photoelectric switches, explosion-proof proximity sensors, and safety limit switches. It has strong versatility and is suitable for high-end sensors.
Input Current: In the signal-on state, the input current of each channel is generally 4-8mA, and the leakage current in the off state is extremely small (usually less than 0.1mA), which has little impact on the load of the external signal source, ensuring high precision and accuracy of signal collection.
Response Time: The response time of the input signal is extremely short and stable, usually within 0.5ms, which can quickly and accurately capture the instantaneous changes of external signals, meeting the scenarios with extremely high requirements for signal real-time and accuracy such as high-speed precision production lines and safety interlocking systems.
(2) Interface Characteristics
External Signal Interface: A high-density military-grade spring-type terminal block is used as the external signal connection interface. Compared with ordinary industrial terminals, it has the advantages of fast wiring speed, stable connection pressure and extremely strong anti-vibration and anti-loosening ability, and can maintain reliable connection in long-term strong vibration environments. The terminal block is clearly marked with input terminals, common terminals and power terminals of each channel, and adopts an anti-misplug design, which is convenient for technicians to wire quickly and accurately, greatly improving the efficiency of installation and commissioning and the reliability of wiring.
Backplane Communication Interface: It realizes high-speed redundant communication with the PLC processor through the enhanced backplane connector of the 1771 I/O enclosure, using a high-reliability parallel data transmission method with a high data transmission rate and a verification mechanism. It ensures that the status of 16 input signals can be synchronized to the PLC controller in real time, accurately and without loss, meeting the strict requirements of key systems for data reliability.
(3) Environmental Adaptability
Operating Temperature: It can work stably in an ultra-wide temperature range of -40°C to 70°C (-40°F to 158°F). Compared with similar products, it has excellent high and low temperature adaptability, and can operate normally in extreme temperature scenarios such as extremely cold outdoor equipment and high-temperature smelting workshops, and the signal collection accuracy is not affected by temperature changes.
Storage Temperature: In the storage state, it can withstand extreme temperatures from -55°C to 90°C (-67°F to 194°F), ensuring that the internal electronic components of the module will not be damaged even in harsh temperature conditions during long-distance transportation and long-term storage, thus guaranteeing the long-term stability of the module's performance.
Anti-Electromagnetic Interference: It meets the highest level of international industrial electromagnetic compatibility standards and has extremely strong anti-electromagnetic interference ability. It has built-in multiple shielding and filtering circuits, which can effectively resist extremely strong electromagnetic interference generated by strong motors, high-power frequency converters, high-voltage equipment, etc. in industrial sites, completely avoiding misjudgment in signal collection and ensuring absolute accuracy and reliability of data.
III. Functional Characteristics
(1) High-Reliability Multi-Channel Signal Collection
The core function of the 1771-IXHR module is to realize high-reliability parallel collection of 16 DC digital signals. Each channel adopts an independent isolation circuit and signal conditioning circuit, with no interference between them. Whether it is multiple key signals triggered at the same time or important signals with high-frequency changes, the module can accurately capture and transmit them in real time, ensuring that the PLC controller can fully, timely and accurately grasp the status of key on-site equipment. For example, in the auxiliary equipment control system of a nuclear power plant, the module can simultaneously collect 16 key signals such as the switch status of multiple safety valves and pressure interlocking signals, providing reliable data support for the PLC controller and ensuring the safe operation of nuclear facilities.
(2) Enhanced Channel-Level Status Indication and Diagnosis
The module is equipped with 16 independent high-brightness LED input status indicators and 2 power indicators (corresponding to +5V and +24V respectively). The indicators are specially designed to be clearly visible in both strong light and dim environments. When an input channel collects a valid signal, the corresponding indicator will light up in real time; the power indicator is always on, indicating that the corresponding power supply is normal. In addition, the module has an advanced channel-level fault diagnosis function, which can not only detect abnormal conditions such as disconnection, short circuit and overvoltage, but also monitor potential problems such as the stability and drift of channel signals. It sends detailed fault codes and diagnostic information to the PLC controller through backplane communication, accurately locating the fault point and fault type, and greatly shortening the fault Investigation and maintenance time.
(3) Advanced Electrical Protection Mechanism
Enhanced Overvoltage Protection: Each input channel is equipped with two independent overvoltage protection circuits. When the input voltage exceeds 40V DC, the protection circuit will act quickly to clamp the input voltage within a safe range, effectively preventing excessive voltage from damaging the precision circuit inside the module.
Intelligent Short-Circuit Protection: When a short circuit occurs in the external signal line, the module will intelligently identify the short-circuit state and quickly limit the input current of the channel, and at the same time send a fault signal to avoid the module being burned due to excessive short-circuit current, and it will not affect the normal operation of other channels at all. It can automatically recover after the fault is eliminated.
Comprehensive Reverse Connection Protection: It supports reverse connection protection of the positive and negative poles of the input signal. Even if the positive and negative poles are connected reversely by mistake during wiring, it will not cause any damage to the module and external equipment. It can return to normal work only by correcting the wiring, minimizing the loss caused by wiring errors.
Surge Protection: The module has a built-in surge protection circuit, which can resist instantaneous high-voltage surges generated by external circuits, protecting the module from damage in cases of power system fluctuations or lightning strikes.
(4) High-Security System Integration and Expansion
The 1771-IXE module is perfectly compatible and safe with all processors of the Allen-Bradley PLC-5 series. It can be connected to the system without any conversion module, and safety-level parameter configuration and signal reading can be performed through RSLogix 5 programming software. In the 1771 I/O enclosure, this module can be mixed with 1771 series high-reliability digital output modules, analog modules, special function modules, etc. to form a safety-level control system. When the system needs more input channels, it can be realized by increasing the number of modules or expanding the I/O enclosure, and it supports redundant configuration, meeting the high safety requirements of large key industrial control systems.
(5) Stable Auxiliary Power Output Function
The module has a built-in high-performance +24V DC auxiliary power supply, which has extremely high output stability and anti-interference ability. It can provide a stable working power supply for external two-wire or three-wire high-precision DC sensors, eliminating the need for an additional independent high-precision power module, simplifying the system's power supply architecture and reducing the overall deployment cost. The auxiliary power supply has complete overcurrent, overvoltage and short-circuit protection functions. When an abnormality occurs in the external sensor circuit, it will automatically cut off the output and send an alarm signal to protect the module and the sensor from damage. After the fault is eliminated, the power supply can be restored manually or automatically.
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