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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power provides 6ES7550-1AA00-0AB0 quotations, manuals, and module-selection guidance.

        6ES7550-1AA00-0AB0

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        1001 reviews ｜ Need a Specific Revision?
        Siemens 6ES7550-1AA00-0AB0 is a SIMATIC S7-1500 technology module with two 24 V counter and position-input channels.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
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        Technical specifications for 6ES7550-1AA00-0AB0

        • Manufacturer:
          Siemens
        • Part Number:
          6ES7550-1AA00-0AB0
        • Product Family:
          Siemens Simatic S7-1500
        • Product Type:
          TM Count 2x24V Technology Module
        • Stock:
          1
        • Technology Channels:
          2 independent counter and position channels
        • Encoder Input Level:
          24 V DC
        • Encoder Signals:
          A, B, and N per channel
        • Digital Inputs:
          3 per channel
        • Digital Outputs:
          2 per channel
        • Counting Width:
          32 bit
        • Maximum Count Frequency:
          200 kHz
        • Measurement Functions:
          Frequency, period, and velocity
        • Rated Supply:
          24 V DC
        • Permissible Supply Range:
          19.2 to 28.8 V DC
        • Maximum Supply Current:
          75 mA
        • Front Connector:
          40-pole push-in connector
        • Protection Rating:
          IP20
        • Horizontal Operating Temperature:
          0 to +60 °C
        • Vertical Operating Temperature:
          0 to +40 °C
        • Storage and Transport Temperature:
          -40 to +70 °C
        • Weight:
          0.551 lbs (0.25 kg)
        • Estimated shipping dimensions:
          16.4x19.1x4.1cm
        • Tariff Code:
          8538909100
        • Country of origin:
          Germany
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Channels Counting Measurement Wiring

        Features:

        • Two channels evaluate 24 V pulse and incremental-encoder signals independently.
        • Channel-specific digital inputs and outputs connect gate, reference, and comparison events.
        • Counting, frequency, period, and velocity values are transferred through the S7-1500 backplane.
        Siemens 6ES7550-1AA00-0AB0 converts two field pulse streams into controller count or measurement data.

        Encoder mode and channel parameters determine how 6ES7550-1AA00-0AB0 interprets A, B, and N signals.

        Front wiring and cabinet orientation complete the operating boundary for 6ES7550-1AA00-0AB0.

        The Siemens 6ES7550-1AA00-0AB0 TM Count 2x24V Technology Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 6ES7550-1AA00-0AB0 TM Count 2x24V Technology Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        Counter Channel Organization

        • Inputs: A, B, and N signals establish pulse, direction, and reference information.
        • Controls: Three digital inputs per channel accept gate, latch, or synchronization events.
        • Outputs: Two digital outputs per channel react to configured comparison conditions.
        • Isolation: The two measurement channels retain separate process data and status paths.

        Value and Event Processing

        • Range: The signed 32-bit value records forward and reverse counting.
        • Capture: Latch and capture functions retain the count at an assigned input event.
        • Comparison: Configured limits can drive a channel output directly.
        • Transfer: The CPU reads values and status through the S7-1500 backplane.

        Frequency and Motion Values

        • Frequency: Pulse intervals are converted into a frequency value.
        • Period: The channel reports the elapsed time between selected signal edges.
        • Velocity: Encoder pulses and configured scaling produce a velocity value.
        • Mode: Only the measurement assigned to the channel is placed in its process data.

        Supply and Front Connection

        • Supply: The 24 V DC input powers encoder, digital-input, and output circuits.
        • Connector: A 40-pole S7-1500 front connector carries field wiring.
        • Orientation: Vertical mounting uses the lower documented upper-temperature limit.
        • Enclosure: The IP20 module requires installation inside a protected cabinet.
        Description
        Siemens 6ES7550-1AA00-0AB0 is a SIMATIC S7-1500 TM Count 2x24V technology module that evaluates two independent 24 V pulse or incremental-encoder channels for counting, position acquisition, frequency, period, and velocity tasks. Each channel transfers its measured value, status, and control information through the S7-1500 backplane to the CPU.

        The two channels of 6ES7550-1AA00-0AB0 each combine A, B, and N encoder inputs with three digital inputs and two digital outputs. The input signals determine direction and reference events, while the outputs can switch at configured comparison values without waiting for a cyclic user-program decision.

        A 32-bit counting range and configurable gate, latch, capture, and synchronization functions let 6ES7550-1AA00-0AB0 relate incoming pulses to machine events. Parameterization defines whether a channel handles an incremental encoder, pulse generator, or supported measurement mode, so the same hardware path is assigned a specific counting or measuring role.

        Power enters 6ES7550-1AA00-0AB0 through the 24 V DC front connection and is distributed to its encoder, input, and output circuits. The module occupies one S7-1500 slot, uses a 40-pole front connector, and retains the documented temperature limit only when cabinet orientation and ventilation match the installation data.
        Alternative Names
        6ES75501AA000AB0 6ES7550 1AA00 0AB0 6ES 7550 1AA00 0AB0 Siemens 6ES7550-1AA00-0AB0 6ES7550-1AA00-0AB0 TM Count 2x24V 6ES7S50-1AA00-0AB0 6ES755O-1AAOO-OABO 6ES7550-IAA00-0AB0
        Technical notes
        The two channels of Siemens 6ES7550-1AA00-0AB0 process encoder inputs, control inputs, and comparison outputs independently while sharing the S7-1500 backplane.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Why does 6ES7550-1AA00-0AB0 count in the wrong direction?
        Check the 6ES7550-1AA00-0AB0 A/B phase order, encoder type, direction parameter, input thresholds, and channel wiring.
        Why does 6ES7550-1AA00-0AB0 miss pulses at higher speed?
        Compare the 6ES7550-1AA00-0AB0 input frequency, signal level, edge quality, cable shielding, filter setting, and encoder supply.
        What causes a comparison output on 6ES7550-1AA00-0AB0 to remain inactive?
        Verify the 6ES7550-1AA00-0AB0 output assignment, comparison value, counting direction, gate state, load wiring, and output diagnostic status.
        How should an unstable velocity value from 6ES7550-1AA00-0AB0 be isolated?
        Inspect the 6ES7550-1AA00-0AB0 encoder resolution, measurement interval, mechanical vibration, shield termination, reference clock, and scaling.
        Why does 6ES7550-1AA00-0AB0 ignore an external gate signal?
        Check the 6ES7550-1AA00-0AB0 digital-input assignment, polarity, 24 V reference, input filter, channel enable, and process-control word.
        What should be checked before replacing 6ES7550-1AA00-0AB0?
        Confirm the 6ES7550-1AA00-0AB0 channel parameters, front-connector wiring, encoder type, comparison settings, supply, and CPU hardware configuration.

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