The ICS Triplex T9431 is a high-reliability analog input module specifically designed for industrial process monitoring, and it belongs to the T9431/2 Series — where the T9431 is the 8-channel version and the T9432 is the 16-channel variant.Equipped with core features including channel isolation, comprehensive diagnostics and fault-tolerant design, this module enables accurate measurement of input current ranging from 0 mA to 24 mA. It achieves line monitoring and field device diagnostics via flexibly configurable voltage bands and switch thresholds, making it widely applicable to industrial control systems with stringent requirements for safety integrity and stability.In addition to providing intuitive status indication through front-panel LEDs, it supports integration with the AADvance Workbench software for parameter configuration, status monitoring and data management. When paired with dedicated terminal components, it can meet the requirements of various system architectures such as simplex, dual-redundant or triple modular redundant (TMR) setups, thus providing robust support for the safe and stable operation of industrial processes.
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Core Functional Features
Channel Configuration & Data Acquisition
- Channel Count: Features 8 fixed independent analog input channels. Each channel provides signal and power isolation from the rest of the system, effectively protecting the controller against field faults.
- Measurement Range: The nominal measurement range is 4 mA DC to 20 mA DC, while the maximum range covers 0 mA DC to 24 mA DC, compatible with mainstream current-mode sensors and field devices in the industrial sector.
- Data Output: Each channel can simultaneously transmit digital status signals and analog data to the processor, delivering comprehensive data source support for process monitoring.
Line Monitoring & Diagnostic Capabilities
- Configurable Voltage Bands: Each input channel is equipped with 5 configurable voltage bands, including 8 distinct switch thresholds to enable hysteresis functionality. These can be adjusted according to actual application scenarios to meet the requirements of line monitoring and field device diagnostics.
- Default Monitoring Levels: Three preset operating state ranges are available. The fault state is defined as 0 mA to 3.8 mA and above 22.0 mA; the normal state ranges from 3.8 mA to 22.0 mA. The module can be quickly put into operation without additional configuration.
- Multi-level Diagnostics: Supports comprehensive system-level and module-level diagnostic functions, which can clearly indicate the location and type of faults to facilitate rapid maintenance and repair. It also supports HART Command #03, allowing collection of HART data from field devices for device status monitoring, parameter comparison and error reporting.
Safety & Fault-tolerant Design
- Safety Integrity Level (SIL): Complies with the IEC 61508 SIL 3 standard (maximum achievable level for a single channel). The final SIL of the system can be flexibly adjusted through rational selection of CPU and input/output voting configurations.
- Fault Isolation & Containment: The module integrates an independent watchdog mechanism to continuously monitor its operational status. If a fault is detected, a shutdown mechanism will be triggered to achieve a higher level of fault containment. Channel isolation can withstand a DC voltage of ±1.5 kV for 1 minute without abnormalities.
Redundancy & Fault Tolerance: When installed in dual-redundant or TMR configurations, it provides fault-tolerant input functionality. Replacement of the input module does not require interrupting the input data flow from the channels to the processor module, ensuring uninterrupted system operation.
Key Performance Parameters
Measurement Accuracy & Resolution
- Resolution: 15-bit, with a least significant bit (LSB) value of 0.98 µA, enabling high-precision current signal acquisition.
- Calibration Accuracy: At 25 °C, the measurement calibration accuracy is ±0.05 mA, meeting the high-precision monitoring requirements of industrial processes.
- Error Characteristics: Under the environment of 25 °C ± 2 °C, the error is 0.21% + 10 µA after 1 year of operation at 40 °C, 0.22% + 10 µA after 2 years, and 0.23% + 10 µA after 5 years, demonstrating excellent long-term stability. The temperature drift coefficient is (0.01% + 0.3 µA)/°C, ensuring measurement accuracy over a wide temperature range.
- Sampling Update Rate: Without filter configuration, the sampling update interval is only 6 ms, allowing for rapid response to changes in field signals.
Power Supply & Power Consumption
- Supply Voltage: Powered by redundant nominal +24 Vdc voltage, which enhances the reliability of the power supply system and prevents module shutdown caused by single power supply failure.
- Power Dissipation: The module power consumption is 3.3 W (equivalent to 11.3 BTU/hr), featuring low energy consumption and suitability for long-term continuous operation.
Mechanical & Environmental Characteristics
- Dimensions: Height × Width × Depth = 166 mm × 42 mm × 118 mm (equivalent to 6-½ in. × 1-21/32 in. × 4-21/32 in.), with a compact structure that saves installation space.
- Weight: Approximately 280 g (equivalent to 10 oz.), facilitating easy installation and maintenance.
- Housing Material: Adopts a non-combustible plastic housing, complying with the safety requirements of industrial environments.
Self-test Interval: The module is equipped with a built-in self-test function, with a self-test interval of less than 1 hour (specific duration depends on system configuration), enabling timely detection of internal faults.
Compatible Components & Configuration
Termination Assemblies
- The module must be used in conjunction with the T9831/2/3 series analog input termination assemblies, where different assemblies are suitable for various system architectures:
- T9831: Designed for simplex configurations, supporting 16 non-isolated analog inputs and compatible with one T9431 or T9432 module.
- T9832: Designed for dual-redundant configurations, supporting 16 isolated analog inputs.
- T9833: Designed for triple modular redundant (TMR) configurations, supporting 16 isolated analog inputs.
- Each sensor input signal is protected by a 50 mA fuse in the termination assembly. The fuses can be replaced without removing the I/O module or termination assembly, ensuring convenient maintenance.
Software Configuration
- Comprehensive module configuration and monitoring can be achieved via the AADvance Workbench software, including the following functions:
- Configuring channel-level and module-level monitoring thresholds, and customizing the current ranges for fault and normal states.
- Reading the module, channel and field connection status indicated by the front-panel LEDs, and associating the status with application variables for real-time viewing on the software interface.
- Configuring the collection and application of HART information to realize device diagnostics and data linkage.
Application Scenarios
With its high safety integrity level, redundant fault-tolerant design and high-precision measurement capability, the ICS Triplex T9431 analog input module is suitable for industrial sectors with stringent requirements for process safety and reliability, such as critical control systems in the petrochemical, power energy, metallurgy and building materials, and rail transit industries. It can be used to collect current signals of various process parameters including pressure, temperature, flow rate and liquid level, providing stable and reliable data support for process control, safety interlocking and equipment diagnostics.
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