The 6ES5 464-8MA21 is an analog input module for the S5-100U system, featuring four inputs at ±50 mV. This model includes linearization capabilities, making it suitable for applications that require precise measurements and linear response from sensors, particularly thermocouples.

Device Description
The 6ES5 464-8MA21 module is designed for analog voltage measurement and features linearization to support thermocouples. It operates with floating connections and can handle temperature compensation directly, making it ideal for applications involving temperature measurement with thermocouples (Types J, K, and L). The module is built with noise suppression and common/series-mode rejection to ensure accurate readings even in industrial environments with significant electrical noise.

Technical Data

    Input Ranges: ±50 mV
    Number of Inputs: Configurable as 1, 2, or 4
    Galvanic Isolation: Between inputs and ground
    Input Resistance: 10 MΩ
    Digital Representation: 12 bits + sign (two's complement, left-justified)
    Measuring Principle: Integrating with dual-slope voltage-time conversion
    Integration Time: 20 ms at 50 Hz (or 16.6 ms at 60 Hz)
    Encoding Time per Input: Max 60 ms at 50 Hz
    Permissible Voltage Difference: ±1 V between inputs
    Linearization Support: Built-in support for Type J, K, and L thermocouples
    Temperature Error: Final value ±0.01%/K
    Weight: Approximately 230 g (8 oz)​

Available Programs
There are no specific preloaded programs for this module; it functions within the Siemens S5 PLC system environment and is compatible with standard analog data processing functions.

Data Program Information
This module does not require a unique data program. Linearization and temperature compensation are hardware functions, with settings available for the specific thermocouple type.

Special Commands
No special commands are needed for module operation. Standard Siemens addressing methods for analog input modules apply, and linearization/temperature compensation functions are configured via physical switches on the module.

Repair and Commissioning Recommendations

    Installation: Connect thermocouples directly to the module terminals, with shielded cables limited to 50 meters for optimal signal integrity.
    Temperature Compensation: Use the internal compensation or external compensation box for thermocouples to avoid temperature-related discrepancies.
    Maintenance: Periodically check the linearization settings and ensure all wiring is secure. Verify the noise suppression settings are appropriate for the installation environment to maintain measurement accuracy​.

+ Siemens S5 100U User Manual (PDF page) 

+ Siemens 6ES5 464-8MA21 User Manual (PDF file)

+ Siemens Automation Homepage >

+ Siemens Automation Contact (for Automation Mall)