KEBA DI 260/A Digital Input Module

Chapter 3: Wiring Configuration and Advanced Function Applications

3.1 Standard digital input wiring

The 16 digital inputs of the module are used to connect field devices such as switches and sensors (such as proximity switches and photoelectric sensors). The wiring example is as follows: One end of the normally open (NO) or normally closed (NC) contact of the field device is connected to the input channel terminal (DI0-DI15) of the module, and the other end is connected to the common 0V terminal on the front of the module. The module is internally connected to the 24V provided by K-Bus through a pull-up resistor. When the external contacts are closed, the input circuit conducts and the voltage is pulled down to nearly 0V. The module recognizes the "1" state and the corresponding LED lights up. This "wet contact" wiring method is universal and reliable.

3.2 Interrupt Input Function

A significant feature of the DI 260/A is that its first two inputs (DI0 and DI1) can be configured as "interrupt inputs". Unlike ordinary inputs that are scanned and read through PLC loops, interrupt inputs can immediately send interrupt requests to the processor when the signal changes, achieving microsecond level (response time of about 100 μ s) fast response. This is crucial for handling high-speed counting, emergency stop signals, or precise phase capture applications. It should be noted that when used as an interrupt input, its anti shake time is fixed at 34 microseconds, and the manual warns that interference pulses exceeding 10V may cause false interrupts. Therefore, extra attention should be paid to signal conditioning and shielding in environments with strong interference.

3.3 Debouncing function

Mechanical switches and contacts inevitably bounce during operation, causing electrical signals to switch on and off multiple times. The module provides a configurable anti shake time (default 1ms, can be set to 100ms), and only when the input signal is stable and continues to exceed the set anti shake time, the system will confirm and process the state change. This function greatly improves the accuracy and stability of mechanical switch signal acquisition. Of course, this feature is only effective when the input is a regular numeric input, and interrupt input uses a fixed short-term stabilization.

Chapter 4: System Integration and Engineering Configuration

4.1 K-Bus Address Setting

The DI 260/A is addressed through a 16 bit dip switch located on the right side of the module and under the protective cover. On the same K-Bus bus, up to 12 modules of the same type can be distinguished. At the factory, all module addresses are set to 0. During system integration, each module of the same type on the same bus must be assigned a unique address. But different types of modules (such as digital input and analog output modules) can have the same address. This is the foundation for implementing modular and scalable I/O systems. The manual emphasizes that the protective covers of K-Bus plugs and address switches located at the end of the bus must be kept locked to prevent dust and static electricity.

4.2 Configuration Data and Tools

As a part of Kemro automation system, the parameters of the module (such as setting DI0/DI1 as interrupt and setting anti shake time) need to be configured at the system level. Configuration data is generated through engineering software suites provided by KEBA, such as KeStudio U2 or U3, and is read and allocated at system startup. The detailed configuration process should refer to the corresponding System Manual. This combination of software and hardware configuration gives the system a high degree of flexibility.

4.3 Connector selection

The module adopts an open terminal block with a grid spacing of 5.08mm. KEBA recommends using specific models of Weidm ü ller plug-in terminal blocks (such as 2-pole, 4-pole, 6-pole, 8-pole), and states that these terminals are not provided with the module but can be purchased from KEBA. Engineers can also use larger terminal blocks to group and connect multiple signals, but they should be aware that this may result in a decrease in current carrying capacity, and should refer to the terminal manufacturer's derating curve. This design balances wiring flexibility and space efficiency.

Chapter 5: Compliance, Technical Data, and Lifecycle

5.1 International Standards and Certification

The design of DI 260/A fully complies with mainstream industrial standards, which is its passport to enter the global market.

European market: It complies with the EC Electromagnetic Compatibility Directive (2004/108/EC) and RoHS Directive (2002/95/EC), and its compliance is demonstrated by following the harmonized standard EN 61131-2:2007 (covering EMC, electrical safety, fire protection, and environmental conditions).

North American market: The module has passed the UL 508 (Industrial Control Equipment) standard certification, meeting the requirements for fire prevention, electric shock prevention, and structural safety.

The manual also specifically reminds that this product is designed for industrial environments and may cause radio interference if used in residential areas.