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        • Lifecycle status

          Discontinued / Obsolete by OEM
          For 7MH4900-3AA01, Apter Power provides quotations, manuals and weighing-system matching support.

        7MH4900-3AA01

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        1001 reviews ｜ Need a Specific Revision?
        The Siemens 7MH4900-3AA01 SIWAREX FTC is a single-channel S7-300 and ET 200M weighing module for continuous scale functions.
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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 7MH4900-3AA01

        • Manufacturer:
          Siemens
        • Part Number:
          7MH4900-3AA01
        • Product Family:
          Siemens Simatic S7-300
        • Product Type:
          SIWAREX FTC Weighing Module
        • Stock:
          1
        • Weighing Channels:
          1
        • Load Cell Input:
          Analog full bridge, 1–4 mV/V
        • Measurement Ranges:
          0–1, 0–2 or 0–4 mV/V
        • Internal Resolution:
          16 million increments
        • Measurement Refresh:
          2.5 ms internal; 10 ms external
        • Load Cell Excitation:
          10.2 V DC, maximum 184 mA
        • Analog Output:
          0–20 mA or 4–20 mA; maximum 520 Ω
        • Digital I/O:
          7 inputs and 8 outputs, 24 V DC
        • Counter Input:
          1 channel, up to 10 kHz
        • Serial Interfaces:
          RS232 and RS485
        • S7 Process Image:
          16 input bytes and 16 output bytes
        • Supply Voltage:
          24 V DC (20.4–28.8 V DC)
        • Typical Power:
          7.5 W
        • Protection:
          IP10 module; IP20 in S7 frame
        • Weight:
          1.1 lbs (0.5 kg)
        • Estimated shipping dimensions:
          15.1×8.7×12.8cm
        • 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 Scale Setup Signal Flow Diagnostics Use Modes

        Features:

        • Single-channel conditioning supports analog full-bridge load cells.
        • Digital, analog and counter signals are handled by one weighing module.
        • PLC exchange uses fixed 16-byte input and output process areas.
        The measurement chain turns a low-level bridge signal into a filtered weight value for the S7 program.

        Local scale functions and PLC logic are connected through the SIWA_FTC function block and assigned data areas.

        Serial ports, current output and digital channels let the weighing result participate in external control sequences.

        The Siemens 7MH4900-3AA01 SIWAREX FTC Weighing Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 7MH4900-3AA01 SIWAREX FTC 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.

        Weighing-channel preparation

        • Scale Type: The parameter set is selected for belt, flow or loss-in-weight operation.
        • Bridge Range: The input range is matched to the connected load-cell signal.
        • Calibration: Zero, characteristic and engineering-unit data define the weight conversion.
        • PLC Block: FB43 SIWA_FTC connects the scale data to the user program.

        Measurement and control routing

        • Sensor Path: Bridge excitation and sense lines terminate at the load-cell interface.
        • Conversion: Filtered measurement values enter the module data records and process image.
        • Current Loop: A selected weight or process value can drive the analog output.
        • Discrete Control: Digital channels exchange interlocks, commands and status signals.

        Fault-location sequence

        • Input Check: Overrange and connection errors are evaluated before calibration changes.
        • Channel Status: Diagnostic data distinguishes module faults from process conditions.
        • Output Review: Current-loop loading and digital group supply are checked independently.
        • Serial Access: SIWATOOL provides a separate route for parameter and diagnostic inspection.

        Continuous-weighing functions

        • Belt Scale: Material flow is derived from belt load and speed information.
        • Solids Flow: Throughput is evaluated for a solids flowmeter arrangement.
        • Loss in Weight: Feed rate is calculated from the change in vessel weight.
        • Integration: Each mode shares its results and commands with the S7 control program.
        Description
        Built for SIMATIC S7-300 and ET 200M stations, Siemens 7MH4900-3AA01 is the SIWAREX FTC single-channel module for continuous weighing. It processes signals from analog full-bridge load cells for belt scales, solids flowmeters and loss-in-weight scales.

        The measurement path in 7MH4900-3AA01 accepts 1–4 mV/V load-cell signals and converts them with an internal resolution of 16 million increments. Selectable filters and measurement ranges allow the scale signal to be conditioned before values enter the S7 process image.

        Control signals around 7MH4900-3AA01 use seven digital inputs, eight digital outputs, one counter input and a 0/4–20 mA analog output. RS232 and RS485 interfaces provide separate serial communication routes, while the module exchanges 16 input bytes and 16 output bytes with the PLC.

        Scale parameters for 7MH4900-3AA01 can be handled through SIWATOOL or the scale data block, and FB43 SIWA_FTC links the weighing function to the S7 program. One vector data block is created per CPU so the application can address the installed weighing module consistently.
        Alternative Names
        7MH49003AA01 7MH 4900 3AA01 7MH4900 3AA01 Siemens 7MH4900-3AA01 SIWAREX FTC Module S7-300 SIWAREX FTC 7MH49OO-3AA01 7MH4900-3AA0I
        Technical notes
        Siemens 7MH4900-3AA01 is a one-channel SIWAREX FTC module with load-cell input, digital I/O, current output and serial communication.
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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 a scale value from Siemens 7MH4900-3AA01 remain unstable after wiring?
        For Siemens 7MH4900-3AA01, verify the selected mV/V range, load-cell resistance, shielding and filter settings before changing the calibration data.
        How is Siemens 7MH4900-3AA01 linked to an S7 user program?
        Integrate Siemens 7MH4900-3AA01 through FB43 SIWA_FTC, assign its 16-byte input and output areas, and create the vector data block once for the CPU.
        What should be traced when the current output of Siemens 7MH4900-3AA01 does not follow the scale value?
        Check whether Siemens 7MH4900-3AA01 is configured for 0–20 mA or 4–20 mA, then verify the assigned process value and the loop load.
        Which condition limits the number of load cells connected to Siemens 7MH4900-3AA01?
        The parallel load-cell arrangement for Siemens 7MH4900-3AA01 must keep the combined resistance within 56–4010 Ω and the excitation current below 184 mA.
        When should the RS232 and RS485 ports of Siemens 7MH4900-3AA01 be distinguished?
        Use the serial interface on Siemens 7MH4900-3AA01 that matches the peer device, baud rate and cable-length requirement; the two ports are not interchangeable without matching settings.
        How can a technician choose the operating mode for Siemens 7MH4900-3AA01?
        Select the Siemens 7MH4900-3AA01 function that matches the documented machine: conveyor belt scale, solids flowmeter or loss-in-weight scale, then parameterize that scale type.

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