Introduction to 21000-28-05-15-028-04-02
The 21000-28-05-15-028-04-02 is a specific configuration of a 16-channel Digital Input (DI) module from the Turck BL20 or a similar modular I/O system. This device is designed to interface with a high density of standard industrial digital sensors, such as proximity switches, push buttons, and limit switches.
As part of a modular and decentralized I/O system, it is built with a robust housing, typically offering a high IP rating for protection against dust and moisture. It collects ON/OFF signals from up to 16 sensors and transmits the data over a fieldbus network, such as PROFIBUS-DP or PROFINET (as indicated by the suffix), to a central PLC. Its modular design allows it to be combined with other I/O modules on a standard mounting rail to create a customized block.
Technical Parameters
The following table details the key specifications for the 21000-28-05-15-028-04-02 I/O module.
| Parameter | Specification / Description |
|---|---|
| Product Family / Series | Modular I/O System (e.g., Turck BL20) |
| Module Type | Digital Input Module |
| Function | 16-channel Digital Input (DI) |
| Input Voltage | 24 V DC |
| Fieldbus Protocol | PROFINET (Indicated by the suffix code) |
| Supply Voltage | 24 V DC |
| Connection Technology | Removable Connector Block (e.g., screw clamp, spring cage) |
| Ingress Protection (IP) | IP20 (for the module itself, when mounted on a rail inside a cabinet) |
| Housing Material | Plastic (e.g., PA) |
| Operating Temperature | -25°C to +60°C (-13°F to +140°F) |
| Mounting | Standard 35 mm DIN Rail |
| Dimensions (L x W x H) | Approx. 125 mm x 22 mm x 117 mm * |
| Approx. Weight | ~ 200 g * |
*Note: These are typical values for a 16-channel BL20 module; exact dimensions may vary.*
Application Scenarios
This 16-channel digital input module is designed for high-density signal acquisition in control cabinet applications, where centralized but modular and scalable I/O is required.
Control Cabinet Wiring: Serving as a centralized I/O point within a control panel for a machine, collecting signals from a large group of sensors (e.g., door interlocks, limit switches, push buttons) with reduced wiring effort.
Automated Production Lines: Monitoring a high density of sensors for part presence, clamping verification, and tooling status across a multi-station production cell from a central cabinet.
Packaging and Palletizing Machinery: Interfacing with multiple sensors on a complex machine from within the main control panel, managing signals for product detection, safety gates, and layer completion.
Process Plant Monitoring: Used in the main control room or local control panels to collect status signals from numerous field devices like limit switches and valve position indicators.
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