The Modicon 170 BDM 346 00 is a high-density, 16-channel analog input module designed for the Modicon 170/180 series of programmable logic controllers (PLCs). It is part of the Modicon Momentum platform, a highly versatile and rugged I/O system known for its reliability in industrial automation.
Its primary function is to interface with analog field devices (like sensors and transmitters) by converting their continuous voltage or current signals into digital values that the PLC’s processor can understand and use for control and monitoring.
Key Specifications
| Feature | Specification |
|---|---|
| Manufacturer / Brand | Schneider Electric (under the AEG Modicon brand, now part of Schneider) |
| Product Family | Modicon Momentum (170/180 Series) |
| Catalog Number | 170 BDM 346 00 |
| Common Order Code / Article Number | 042 702 609 |
| Module Type | Analog Input |
| Number of Channels | 16 (sixteen) single-ended channels |
| Signal Types | Voltage: 0 to 10V DC Current: 0 to 20 mA or 4 to 20 mA (selectable per channel) |
| Resolution | 12 bits (providing 4096 counts of resolution) |
| Input Impedance | Voltage: > 1 MΩ Current: 250 Ω |
| Isolation | Channel-to-channel isolation, and group-to-bus isolation. |
Detailed Functional Description
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High-Density I/O: With 16 channels in a single module slot, it offers excellent space efficiency, reducing the need for multiple modules and saving on rack space and cost.
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Flexible Configuration: Each of the 16 channels can be individually configured (via the PLC programming software) for:
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Voltage Input (0 to 10V): Commonly used for potentiometers, pressure sensors, and position sensors.
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Current Input (0 to 20 mA or 4 to 20 mA): The industry-standard 4-20 mA signal is widely used for process variables like temperature, flow, and level, as it is less susceptible to noise and allows for “live zero” detection (a 4 mA signal indicates the loop is healthy, while 0 mA indicates a fault).
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Diagnostics: The module includes diagnostic capabilities that can be monitored by the PLC, such as:
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Over-range / Under-range detection: Flags when the input signal exceeds the expected range.
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Wire break detection: Particularly for 4-20 mA inputs, if the current drops below a certain threshold (e.g., 3.6 mA), it can indicate a broken wire or sensor failure.
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Momentum Platform Integration: It connects to a Modicon Momentum rack or a remote I/O drop (using a Network Interface Module like the 170 AMM 090 00). It is configured and programmed using Schneider Electric’s Unity Pro or Concept PLC programming software.
Typical Applications
This module is used in a wide range of industrial automation and process control applications where multiple analog signals need to be monitored. Common examples include:
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Process Control: Monitoring temperature, pressure, flow rate, and level in chemical, water, and wastewater treatment plants.
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Factory Automation: Reading analog signals from sensors on production lines, such as position feedback, speed, or tension.
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HVAC Systems: Monitoring temperature and pressure sensors in large building management systems.
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Manufacturing: Interfacing with analog measuring equipment and inspection devices.
