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        • Lifecycle status

          Discontinued / Obsolete by OEM
          For 7MH4930-0AA01, Apter Power supplies quotations, manuals, and ordering support.

        7MH4930-0AA01

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        The Siemens 7MH4930-0AA01 SIWAREX MS module connects one scale to SIMATIC S7-200 and provides RS232 and TTY interfaces.
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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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        Technical specifications for 7MH4930-0AA01

        • Manufacturer:
          Siemens
        • Part Number:
          7MH4930-0AA01
        • Product Family:
          Siemens Simatic S7-200
        • Product Type:
          SIWAREX MS Weighing Electronics
        • Stock:
          1
        • Scale Connections:
          1
        • Load-Cell Type:
          Full-bridge strain gauge, 1–4 mV/V
        • Load-Cell Excitation:
          6 V
        • Load-Cell Distance:
          Up to 500 m with specified cable
        • PC Interface:
          RS232 for SIWATOOL MS
        • Display Interface:
          TTY for remote digital display
        • Module Supply:
          24 V DC, 20.4–28.8 V static range
        • Supply Current:
          130 mA maximum at 24 V
        • Bus Current:
          Typically below 140 mA at 5 V
        • Power Loss:
          5 W typical
        • Rack Placement:
          Directly behind the S7-200 CPU
        • Weight:
          0.397 lbs (0.18 kg)
        • Estimated shipping dimensions:
          15.4×13.4×8.9cm
        • 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 Rack Placement Scale Signal Chain Service Access Calibration Records

        Features:

        • 7MH4930-0AA01 adds one weighing channel to a SIMATIC S7-200 controller.
        • The module accepts a 1–4 mV/V full-bridge load-cell signal.
        • RS232 and TTY are assigned to separate commissioning and display functions.
        Weight data is processed in the PLC after the module converts the low-level bridge signal.

        The module order code identifies SIWAREX MS hardware, not a load cell or a complete scale.

        The 24 V supply powers the module and S7-200 bus interface, while the load-cell bridge receives a separate 6 V excitation.

        The Siemens 7MH4930-0AA01 SIWAREX MS Weighing Electronics may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 7MH4930-0AA01 SIWAREX MS Weighing Electronics 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.

        S7-200 Expansion Order

        • Module position: SIWAREX MS modules are installed directly behind the CPU.
        • CPU 222 limit: A CPU 222 permits two 7MH4930-0AA01 modules.
        • CPU 224/226 limit: CPU 224 and CPU 226 permit up to four 7MH4930-0AA01 modules.

        Bridge Excitation and Return

        • Excitation pair: EXC+ and EXC− deliver the 6 V load-cell supply.
        • Measurement pair: SIG+ and SIG− return the measurement voltage.
        • Sense pair: SEN+ and SEN− compensate the supply level in a six-wire connection.

        Two Serial Roles

        • PC setup: RS232 links 7MH4930-0AA01 to a PC running SIWATOOL MS.
        • Display output: TTY carries the indicated weight to the supported remote display.
        • Interface separation: The two interfaces are not interchangeable wiring points.

        Parameter Transfer and Backup

        • Offline file: Scale data can be edited and stored offline.
        • Record transfer: Online operation transfers complete data records to 7MH4930-0AA01.
        • Adjustment method: Adjustment can use a physical weight or the theoretical method.
        Description
        The weighing value enters a SIMATIC S7-200 system through Siemens 7MH4930-0AA01, a SIWAREX MS expansion module for one scale. The module is installed directly after the CPU so the controller can process the measured weight within the automation program.

        At the field side, 7MH4930-0AA01 supplies and reads a full-bridge strain-gauge circuit with a 1–4 mV/V characteristic. Multiple load cells are paralleled through a SIWAREX JB junction box, and a SIWAREX EB extends the load-cell cable when the available sensor lead is shorter than the required run.

        Two serial paths serve different tasks on 7MH4930-0AA01. RS232 connects a PC running SIWATOOL MS for parameter transfer, diagnostics and calibration work, while the TTY interface carries weight information to the defined remote digital display.

        Scale parameters for 7MH4930-0AA01 can be prepared offline, transferred online and retained as a file. The same service workflow supports adjustment with a physical weight or theoretical adjustment when an adjustment weight is not used.

        Rack capacity for 7MH4930-0AA01 follows the S7-200 CPU: a CPU 222 accepts up to two modules, and CPU 224 or CPU 226 accepts up to four. Other expansion modules follow the SIWAREX MS group and share the available expansion-bus current.
        Alternative Names
        7MH49300AA01 7MH 4930-0AA01 Siemens 7MH4930-0AA01 SIWAREX MS 7MH4930-0AA01 7MH4930 0AA01 Weighing Electronics Siemens SIWAREX Micro Scale Module S7-200 SIWAREX MS Expansion Module SIWAREX MS One-Scale Electronics
        Technical notes
        Siemens 7MH4930-0AA01 must be placed directly behind the S7-200 CPU before other expansion modules. RS232 is assigned to SIWATOOL MS, while TTY is reserved for the remote display path.
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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
        Where must 7MH4930-0AA01 be placed in an S7-200 expansion chain?
        7MH4930-0AA01 must be installed directly behind the S7-200 CPU, with other expansion modules following the SIWAREX MS modules.
        Why can a CPU 222 accept fewer 7MH4930-0AA01 modules than a CPU 224 or CPU 226?
        The documented 7MH4930-0AA01 limit is two modules for CPU 222 and four for CPU 224 or CPU 226, subject to the complete expansion-bus load.
        Can 7MH4930-0AA01 be adjusted when no certified test weight is available?
        7MH4930-0AA01 supports theoretical adjustment through SIWATOOL MS, provided the required scale and load-cell data are entered correctly.
        Which connector should be checked when SIWATOOL MS cannot reach 7MH4930-0AA01?
        For 7MH4930-0AA01, check the RS232 service cable and PC COM-port settings; the TTY interface is intended for the remote display.
        How should multiple load cells be connected to 7MH4930-0AA01?
        Multiple load cells for 7MH4930-0AA01 are connected in parallel through a SIWAREX JB junction box, with the specified shield and pair assignments maintained.
        What should be preserved before replacing a 7MH4930-0AA01 module?
        Before changing 7MH4930-0AA01, save the SIWATOOL parameter data and diagnostic buffer so the scale configuration can be restored and compared.

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