Available. The Siemens 6ES7138-6AA01-0BA0 is a technology module designed for the SIMATIC ET 200SP system, serving as a 24 V counter module. It features a single channel compatible with 24 V incremental or pulse encoders, and includes 3 digital inputs (DI) and 2 digital outputs (DQ). This module is suitable for use with BU type A0 and is supplied as a single unit per package. Key characteristics include: - **Voltage Rating**: 24 V DC - **Input Frequency Range**: 0.04 Hz to 800 kHz - **Cycle Duration Measurement**: 1.25 µs to 25 s - **Accuracy**: 100 ppm, depending on measuring interval and signal evaluation - **Isolation**: Tested with 707 V DC - **Ambient Temperature Range**: Horizontal installation: -30 °C to 60 °C; Vertical installation: -30 °C to 50 °C; Ceiling and floor installation: -30 °C to 50 °C - **Dimensions**: Width: 15 mm; Height: 73 mm; Depth: 58 mm - **Weight**: Approximately 45 g This module is ideal for applications requiring precise counting and measurement functions within the SIMATIC ET 200SP system.