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        • Lifecycle status

          Discontinued / Obsolete by OEM
          For 7MH4950-1AA01, Apter Power provides manuals, quotations, and product-selection assistance.

        7MH4950-1AA01

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        For one platform or hopper scale, Siemens 7MH4950-1AA01 is a SIWAREX U1 module that excites analog load cells and transfers measured weight into S7-300 or ET 200M data.
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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.
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        Technical specifications for 7MH4950-1AA01

        • Manufacturer:
          Siemens
        • Part Number:
          7MH4950-1AA01
        • Product Family:
          Siemens ET 200M
        • Product Type:
          SIWAREX U1 Single-Channel Weighing Module
        • Stock:
          1
        • Weighing Channels:
          1
        • Scale Types:
          Platform or hopper scale
        • Load-Cell Input Range:
          1–4 mV/V
        • Load-Cell Excitation:
          6 V DC; maximum 150 mA
        • Permitted Load Resistance:
          Greater than 40 ohms and less than 4010 ohms
        • Front Connector:
          20-pin
        • Service Interface:
          RS232
        • Remote Display Interface:
          TTY
        • External Supply:
          24 V DC
        • SIMATIC Platforms:
          S7-300 and ET 200M
        • Parameter Storage:
          Nonvolatile module memory
        • Weight:
          0.6063 lbs (0.275 kg)
        • Estimated shipping dimensions:
          4x12.5x13cm
        • Tariff Code:
          85389091
        • 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 Load-Cell Path Wiring Groups SIMATIC Data Calibration

        Features:

        • One weighing channel converts an analog load-cell bridge signal into SIMATIC weight data.
        • The module supplies 6 V DC excitation to the connected full-bridge load-cell circuit.
        • RS232 commissioning, TTY display and PLC backplane data use separate communication paths.
        SIWAREX U1 serves one platform or hopper scale inside an S7-300 or ET 200M station.

        Calibration parameters relate the millivolt-per-volt input to the engineering value used by the controller.

        Field supply, load-cell conductors, service communication and remote indication terminate on defined connections around the module.

        The Siemens 7MH4950-1AA01 SIWAREX U1 Weighing Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 7MH4950-1AA01 SIWAREX U1 Weighing 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.

        Converting bridge output into a weight value

        • Bridge excitation: The module provides 6 V DC to the connected analog full-bridge load cells.
        • Signal return: The bridge output returns as a 1–4 mV/V measurement signal.
        • Parallel cells: Multiple cells may share the channel when their combined resistance stays within the specified range.
        • Digital result: The converted value and status become available to the SIMATIC controller.

        Keeping measurement and communication conductors assigned

        • Front connector: Load-cell, supply and signal conductors terminate on the documented 20-pin assignment.
        • Shield path: The measurement cable shield follows the specified termination so interference does not become weight error.
        • Field supply: A 24 V DC source powers the weighing electronics independently of the backplane data path.
        • Remote display: The TTY connection carries the separate output intended for the supported display.

        Passing measured weight to the controller

        • Backplane exchange: The S7-300 or ET 200M interface transfers weight, commands and status between PLC and module.
        • Data records: Parameter and command records define calibration and operating behavior.
        • Diagnostic status: Module and measurement faults are returned with the process information.
        • Stored setup: Nonvolatile memory retains the weighing parameters used after a restart.

        Relating electrical signal to the scale reference

        • Zero point: Calibration records the unloaded electrical value for the installed load-cell circuit.
        • Reference load: A known load establishes the relationship between bridge output and engineering weight.
        • SIWATOOL path: The RS232 service interface allows parameter work without using the TTY display path.
        • Order check: The exact U1 suffix should remain in the commissioning record before parameters are transferred.
        Description
        Siemens 7MH4950-1AA01 is a single-channel SIWAREX U1 weighing module for SIMATIC S7-300 and ET 200M stations. It supplies one analog load-cell circuit, converts the bridge signal into a weight value and places that value in the controller data path.

        One or more parallel full-bridge load cells connect to 7MH4950-1AA01 through the module front connector. The module provides the excitation voltage and measures the resulting millivolt-per-volt signal, so total load resistance must remain inside the documented input boundary.

        Calibration and parameter records stored by 7MH4950-1AA01 define how the electrical load-cell signal becomes engineering weight data. The PLC reads the result and diagnostic status through the SIMATIC backplane, while the RS232 service port provides a separate route for SIWATOOL commissioning.

        A 24 V DC field supply powers the measurement section of 7MH4950-1AA01. The optional TTY path can drive the documented remote display, keeping the local weight indication separate from the PLC data exchange and the RS232 configuration connection.
        Alternative Names
        7MH49501AA01 7MH 4950-1AA01 7MH4950 1AA01 Siemens 7MH4950-1AA01 SIWAREX U1 7MH4950-1AA01 ET 200M 7MH4950-1AA01 7MH4950-1AAO1 7MH495O-1AA01
        Technical notes
        Siemens 7MH4950-1AA01 is the single-channel SIWAREX U1 version. Confirm the 1AA01 suffix, load-cell bridge range and front-connector wiring before calibration.
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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
        Can 7MH4950-1AA01 operate two independent scales?
        No. The 7MH4950-1AA01 is a single-channel U1 module; parallel cells may form one scale, but they do not create a second independent channel.
        What should be checked if the input of 7MH4950-1AA01 is unstable?
        Check load-cell excitation, shield termination, connector assignment and combined bridge resistance at 7MH4950-1AA01 before changing calibration values.
        How does 7MH4950-1AA01 send weight to the PLC?
        The 7MH4950-1AA01 converts the bridge signal locally and exchanges weight, commands and diagnostic status through the SIMATIC backplane.
        Which interface is used to commission 7MH4950-1AA01 with SIWATOOL?
        Use the RS232 service interface of 7MH4950-1AA01; the TTY connection is the separate path for the supported remote display.
        Why must total load resistance be checked on 7MH4950-1AA01?
        Parallel load cells change the circuit resistance seen by 7MH4950-1AA01, and that total must remain inside the documented measurement boundary.
        What information should be retained before moving parameters to another 7MH4950-1AA01?
        Retain the exact 7MH4950-1AA01 order number, load-cell arrangement, zero point and reference-load calibration records before transferring the setup.

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