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        7MH4138-6AA00-0BA0

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        Siemens 7MH4138-6AA00-0BA0 is a single-channel SIWAREX WP321 ST weighing module for full-bridge strain-gauge load cells in SIMATIC ET 200SP.
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        Ships by Wednesday, October 28
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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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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        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
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 7MH4138-6AA00-0BA0

        • Manufacturer:
          Siemens
        • Part Number:
          7MH4138-6AA00-0BA0
        • Product Family:
          Siemens Simatic ET 200SP
        • Product Type:
          TM SIWAREX WP321 ST Weighing Module
        • Stock:
          1
        • Load-Cell Channels:
          1
        • Input Sensor:
          Full-bridge strain-gauge load cells
        • Bridge Wiring:
          4-wire or 6-wire
        • Input Range:
          ±1, ±2 or ±4 mV/V
        • Bridge Resistance:
          40–4100 Ω
        • Sampling Rate:
          600 Hz
        • Signal Resolution:
          ±500,000 parts per mV/V
        • Service Interface:
          1×RS485, up to 115.2 kbit/s
        • Load-Cell Cable:
          Up to 500 m with 7MH4702-8AG cable
        • BaseUnit:
          Type A0
        • Operating Temperature:
          −25 to +60 °C horizontal; −25 to +50 °C vertical
        • Weight:
          0.066 lbs (0.03 kg)
        • Estimated shipping dimensions:
          7.8×2.5×6.8cm
        • 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 Interface Conversion Path RS485 Access Diagnostic Flow

        Features:

        • 7MH4138-6AA00-0BA0 places one full-bridge weighing channel in a SIMATIC ET 200SP station.
        • Four-wire and six-wire sensor connections enter the same measurement path.
        • The RS485 port is separate from the station data exchanged through the BaseUnit.
        The selected mV/V range determines the conversion span used for the connected load-cell bridge.

        DIAG and PWR indications combine module, supply and wiring status at the front of the assembly.

        Automatic mechanical coding ties the module type to its ET 200SP station position after the first insertion.

        The Siemens 7MH4138-6AA00-0BA0 TM SIWAREX WP321 ST Weighing Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 7MH4138-6AA00-0BA0 TM SIWAREX WP321 ST 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.

        Bridge Connection Logic

        • Sense feedback: Sense conductors in a six-wire bridge return the excitation level to 7MH4138-6AA00-0BA0.
        • Four-wire return: A four-wire bridge uses the same signal pair without separate sense feedback.
        • Resistance limit: Bridge resistance must remain within the module input boundary.

        From Bridge Signal to Station Data

        • Range selection: The analog bridge level enters the selected ±1, ±2 or ±4 mV/V range.
        • Sampling stage: Sampling at 600 Hz produces the internal measurement stream.
        • Station transfer: The processed value is transferred through the ET 200SP address area.

        Independent Service Connection

        • SIWATOOL access: SIWATOOL V7 can use the RS485 interface for module access.
        • Junction-box endpoint: A SIWAREX DB digital junction box can occupy the same defined port role.
        • Remote display: A compatible remote display is another documented RS485 endpoint.

        Fault Visibility

        • Supply monitoring: Supply-voltage monitoring feeds module diagnostics.
        • Wiring faults: Wire-break and short-circuit conditions are reported through the diagnostic function.
        • Controller notification: Parameterized diagnostic and hardware interrupts can reach the controller.
        Description
        Siemens 7MH4138-6AA00-0BA0 is the TM SIWAREX WP321 ST single-channel weighing module for SIMATIC ET 200SP. It connects one analog strain-gauge load-cell circuit to the distributed I/O station and converts the bridge signal into weighing data for the controller.

        Four-wire and six-wire full-bridge connections are both accepted by 7MH4138-6AA00-0BA0. The selectable ±1, ±2 and ±4 mV/V measuring ranges correspond to different conversion spans, while the 600 Hz sampling process and stated resolution define how the module acquires changes from the connected bridge.

        A separate RS485 port gives 7MH4138-6AA00-0BA0 a path to SIWATOOL V7, a SIWAREX DB digital junction box or a compatible remote display. Supply monitoring, wire-break detection, short-circuit detection, group diagnostics and the DIAG/PWR indicators expose faults without changing the load-cell measurement path.

        Installation of 7MH4138-6AA00-0BA0 uses a type A0 BaseUnit and automatic mechanical coding. The module exchanges 16 input bytes and 16 output bytes with the station and supports configuration through STEP 7/TIA Portal or the published PROFIBUS and PROFINET device descriptions.
        Alternative Names
        7MH41386AA000BA0 7MH 4138-6AA00-0BA0 Siemens 7MH4138-6AA00-0BA0 SIWAREX WP321 ST 7MH4138-6AA00-0BA0 TM SIWAREX WP321 ST 7MH4138-6AA00-0BA0 7MH4138 6AA00 0BA0 Weighing Module Siemens WP321 ST Weighing Electronics ET 200SP SIWAREX WP321 ST Module
        Technical notes
        Siemens 7MH4138-6AA00-0BA0 uses a type A0 BaseUnit and accepts either four-wire or six-wire full-bridge load-cell wiring. RS485 termination and the selected mV/V range must match the connected weighing hardware.
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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 can 7MH4138-6AA00-0BA0 show an unstable weight even when the ET 200SP station is communicating?
        For 7MH4138-6AA00-0BA0, verify the selected mV/V range, bridge excitation, shield continuity and whether the load cell is wired as a four-wire or six-wire bridge.
        Which BaseUnit is required when installing 7MH4138-6AA00-0BA0?
        7MH4138-6AA00-0BA0 is specified for a type A0 BaseUnit, and its mechanical coding must align with that station position.
        Can the RS485 port on 7MH4138-6AA00-0BA0 be used for both SIWATOOL and a remote display at the same time?
        7MH4138-6AA00-0BA0 provides one RS485 interface, so the endpoint and termination arrangement must be selected for the intended connection.
        What should be checked when 7MH4138-6AA00-0BA0 reports a wire-break diagnostic?
        For 7MH4138-6AA00-0BA0, inspect the excitation, signal and sense pairs, the junction box, the shielded cable and the bridge resistance before changing the module.
        How is a 500 m load-cell run distinguished from the RS485 limit on 7MH4138-6AA00-0BA0?
        The 500 m boundary for 7MH4138-6AA00-0BA0 applies to the specified SIWAREX load-cell cable, while the RS485 interface has its own shielded-cable limit.
        Why does the measuring range matter before calibrating 7MH4138-6AA00-0BA0?
        The ±1, ±2 or ±4 mV/V selection on 7MH4138-6AA00-0BA0 sets the conversion span that must cover the connected bridge output.

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