Products Description
AS-B872-200 output module is specifically designed for industrial automation systems, used to convert digital signals within the control system into precise analogue output signals. Compared with the standard output module, it has been optimised in response speed and load adaptability, capable of supporting higher power and more complex process loops, and meeting the industrial demand for simultaneous control of multiple loops and multiple devices.
Technical Specifications
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Brand |
Modicon |
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Model |
AS-B872-200 |
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Part Number |
AS-B872-200 |
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Description |
Output Module |
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Origin |
France / USA |
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Dimension |
35*20*10cm |
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Weight |
0.3kg |
Technical Description
High-Resolution Current Output
The module employs a high-resolution DAC (Digital-to-Analogue Converter) to generate a 4–20 mA analogue current output. Each channel features extremely fine output resolution, enabling milliampere- or even microampere-level adjustment precision, ensuring close alignment between the output signal and control system commands. Integrated temperature compensation circuitry mitigates the effects of ambient temperature variations on output accuracy, guaranteeing long-term stability and reliable operation under diverse environmental conditions.
High Linearity and Response Consistency
The output current exhibits excellent linearity, enabling a highly accurate linear mapping between the input digital signal and the output across the entire 4–20 mA range. The internal circuit design ensures consistent response characteristics across all channels, eliminating deviations when multiple channels simultaneously control different devices. This ensures that the output signal of each channel synchronously follows its corresponding control command.
Signal Smoothing and Noise Suppression
The module incorporates a smooth transition design in its output signal to prevent step changes or abrupt current fluctuations. The output path integrates low-pass filtering and anti-interference circuits, effectively suppressing high-frequency noise and electromagnetic interference. This ensures stable and continuous current output, making the module well-suited for complex industrial environments involving long-distance cabling or high levels of electrical noise.
Independent Channel Control and Load Compatibility
Each channel operates independently with electrically isolated output circuits, ensuring that load variations or faults in one channel do not affect the accuracy of other channels. The output circuitry is optimised to accommodate a wide range of impedances and load types-such as valves, motors, and pumps-maintaining precise current output under varying load conditions without requiring external amplification or compensation components.
Technical features
1️ ️ electrical isolation design
Each output channel is completely isolated from the internal control circuit of the module and other channels.
Adopt optocoupler isolation or transformer isolation to prevent high-frequency noise, voltage spikes or common ground interference from being conducted to the output circuit.
The isolation voltage can usually reach several hundred volts, ensuring that long-distance wiring or complex industrial environments are not affected by interference.
Electrical isolation also protects modules and control systems from damage caused by abnormal loads or external interference.
2️ ️ optimisation of differential signals and driving capabilities
The module output adopts a differential drive or a high drive capacity current source:
Differential drive can counteract common-mode noise; that is, when both ends of the cable are simultaneously interfered with, the signal variation is automatically cancelled out.
The high driving capacity ensures that the output current can still maintain an accuracy of 4-20mA when transmitted over long-distance cables (tens or even hundreds of meters).
The built-in current source can dynamically adjust the output voltage according to the load impedance to ensure the stability of the load current.
3️ ️ signal filtering and anti-noise circuit
The module output path integrates multi-level filtering and anti-interference design:
Low-pass filter: Filters out high-frequency interference signals and smooths out the output current waveform.
EMI/RFI suppression circuit: Absorbs electromagnetic waves and radio frequency interference to prevent noise from affecting output accuracy.
Capacitor/common mode inductor: Suppresses transient spikes and wire interference at the output port.
These measures ensure that analogue signals can be stably output even when the cable passes beside the motor, solenoid valve or high-power switch.
4️ ️ dynamic compensation and stability control
The module is equipped with a feedback loop and an automatic compensation mechanism inside:
The output current is adjusted in real time through internal sampling and control feedback to quickly compensate for cable voltage drop or load impedance changes.
When the load changes or the line length causes voltage fluctuations, the module automatically adjusts the drive voltage to ensure that the output current at the load end remains within the set range.
Multi-channel independent control ensures that changes in a single loop will not affect the output accuracy of other channels.
Our Service Processes
Pre-sales Consultancy
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Confirmation of receipt
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After-sale Services
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