Siemens SIMATIC S5-100U 6ES5 421-8MA12 Digital Input module
$ 73.4
Description
Siemens SIMATIC S5-100U 6ES5 421-8MA12 Digital Input module. Type: Digital Input Module. Check the Bus Unit: Ensure the module is firmly seated on the 700-series bus unit; a loose connection often causes I/O errors in the CPU. Input Current: Typically 8.5 mA. Status Indicators: It features8 LEDs on the front panel to indicate the status (High/Low) of each individual input channel. The 6ES5 421-8MA12 is a Digital Input module from the legacy Siemens SIMATIC S5-100U automation system. Since the S5 series is now mature (discontinued), these modules are primarily sought after for maintenance of existing industrial machinery or as surplus replacements. Technical Specifications This specific module is designed for interfacing standard digital signals into the S5 controller environment. Type: Digital Input Module Inputs: 8 Channels Voltage Rating: 24V DC Input Current: Typically 8.5 mA Isolation: Galvanic isolation between the bus and the inputs Connection: Requires a front connector (typically a 20-pin screw or spring terminal block) Key Features and Usage Compact Design: Part of the S5-100U range, which was known for its "block" design where modules snap onto a bus unit (DIN rail mounted). Status Indicators: It features 8 LEDs on the front panel to indicate the status (High/Low) of each individual input channel. Compatibility: Works with S5-90U, 95U, and 100U central controllers. Common Troubleshooting Tips If you are testing or installing this unit, keep these points in mind: Check the Bus Unit: Ensure the module is firmly seated on the 700-series bus unit; a loose connection often causes I/O errors in the CPU. Addressing: In the S5 system, the address is determined by the physical slot position on the DIN rail. Polarity: Ensure the 24V DC supply to the sensors is sharing a common ground with the module’s L- terminal to ensure the signal is registered correctly.
