6SE7021-6ES87-2DC0 SIEMENS Analog output module

Description

6SE7021-6ES87-2DC0 SIEMENS Analog output module

Product Dimensions：

Product Description

A Siemens analog output module serves as the interface between the digital control logic of a PLC and the analog actuators in the field. It receives a numerical value from the central processing unit and converts it into a proportional voltage or current signal through an internal digital-to-analog converter (DAC). These modules are engineered to provide high-linearity outputs with minimal drift, ensuring that the command sent by the software is accurately reflected in the physical behavior of the connected equipment. They typically include galvanic isolation to prevent electrical interference from the field side from affecting the internal system bus.

Product Parameters

The performance of analog output modules is defined by their ability to provide precise and stable signal levels:

• Signal Ranges: Support for standard industrial ranges, including voltage outputs (e.g., +/-10V, 0-10V) and current loops (e.g., 0-20mA, 4-20mA).

• Resolution: High-bit resolution (typically 12 to 16 bits) that dictates the smoothness and granularity of the signal transition.

• Accuracy: Low total error limits, including compensation for temperature coefficients and linearity errors.

• Settling Time: The speed at which the output signal reaches its final value after a change in the digital input, critical for fast control loops.

• Load Impedance: Specified maximum resistance for current outputs and minimum resistance for voltage outputs to ensure signal stability.

• Diagnostics: Monitoring for external faults such as short circuits, wire breaks, or loss of load power.

Product Advantages

• High Precision Control: Enables the smooth regulation of machinery, preventing the mechanical stress associated with abrupt on/off switching.

• Integrated Diagnostics: Real-time feedback on the health of the output loop allows maintenance teams to identify wiring issues or actuator failures immediately.

• Dynamic Response: Optimized for closed-loop control applications where rapid and accurate adjustments are necessary to maintain process stability.

• Flexible Configuration: Channels can often be parameterized individually via software, allowing a single module to handle different signal types simultaneously.

• TIA Portal Integration: Simplified scaling and normalization of values within the engineering software, reducing the complexity of the user program.

Usage Precautions

• Shielding and Grounding: Analog signals are highly susceptible to electromagnetic interference; use shielded twisted-pair cables and ensure proper grounding at the cabinet entry.

• Load Compatibility: Verify that the actuator’s input impedance matches the module’s drive capabilities to prevent signal clipping or hardware overheating.

• Potential Isolation: Ensure that there are no unintended potential differences between the module’s ground and the actuator’s ground, which could introduce measurement offsets.

• External Power Supply: Many modules require a dedicated and stabilized 24V DC supply to power the output circuitry; ensure this supply is free from heavy switching noise.

• Signal Calibration: Depending on the application’s precision requirements, periodic verification of the output signal against a calibrated reference may be necessary.

Product Applications

• Speed Regulation: Providing setpoint signals to frequency converters or variable speed drives to control motor velocity.

• Valve Positioning: Controlling the degree of opening for proportional valves in hydraulic, pneumatic, or fluid processing systems.

• Process Heating: Interfacing with power controllers to modulate the intensity of industrial heating elements or infrared lamps.

• Actuator Modulation: Driving dampers and louvers in large-scale HVAC systems to maintain precise airflow and temperature.

• Signal Retransmission: Sending process variables or calculated values to external chart recorders, displays, or third-party monitoring systems.

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