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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power coordinates 6FM1705-3AA00 manuals, quotations, product selection, and system matching.

        6FM1705-3AA00

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        Siemens 6FM1705-3AA00 is a WF705 position decoder module that collects absolute position values from as many as twelve SSI encoders for SIMATIC S5 processing.
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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 6FM1705-3AA00

        • Manufacturer:
          Siemens
        • Part Number:
          6FM1705-3AA00
        • Product Family:
          Siemens Simatic S5
        • Product Type:
          WF705 Position Decoder Module for 12 SSI Absolute Encoders
        • Stock:
          1
        • Measured Axes:
          Up to 12
        • Encoder Interface:
          Synchronous Serial Interface (SSI)
        • Encoder Code:
          Gray
        • Transferred Data Format:
          Dual code to SIMATIC
        • SSI Data Length:
          25 bit
        • Encoder Resolution:
          128–8192 steps per revolution
        • Maximum Encoder Revolutions:
          4096
        • Fast Transfer:
          1 Mbit/s up to 25 m
        • Long-Distance Transfer:
          125 kbit/s up to 120 m
        • Internal Supply:
          5 V DC from SIMATIC
        • Internal Current:
          500 mA without encoders
        • Encoder Supply:
          External 24 V DC through X6
        • Maximum Direct-Encoder Current:
          300 mA per encoder
        • Encoder Signal Input Current:
          10 mA
        • Peripheral Address Space:
          4 bytes
        • Module Address:
          PB 4–252 in multiples of 4
        • Monitoring:
          Cable break and short circuit
        • Cooling:
          No fan rack required
        • Weight:
          1.1023 lbs (0.5 kg)
        • 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 Encoder Paths Addressing Data Conversion Cable Diagnostics

        Features:

        • Twelve independent SSI axes can be acquired by one WF705 module.
        • Direct encoder wiring and three-channel actual-value distributors can be combined within one installation.
        • Cable-break and short-circuit monitoring identify faults in the encoder signal path.
        The WF705 receives absolute Gray-code words from serial encoders and makes the converted positions available in the PLC peripheral area.

        A directly wired encoder receives its 24 V DC feed through the module, while distributor-fed groups use the external distributor supply path.

        Transfer rate, cable length, module address and encoder resolution are configured together so each axis is read into the intended PLC data location.

        The Siemens 6FM1705-3AA00 WF705 Position Decoder Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 6FM1705-3AA00 WF705 Position Decoder 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.

        Routing direct and distributed SSI signals

        • Direct connection: An SSI encoder can connect to the WF705 while receiving its 24 V DC supply from the module.
        • Distributed group: One actual-value distributor carries clock and data for as many as three encoders.
        • Mixed arrangement: Direct and distributor-fed encoders can share one module when their supplies use the required common ground.
        • Axis capacity: The complete arrangement cannot exceed the twelve independent axis channels handled by the WF705.

        Placing the WF705 in the S5 peripheral area

        • Address width: Each module reserves four consecutive bytes in the peripheral address space.
        • Start value: The starting address is selected from PB 4 through PB 252 and must be divisible by four.
        • Rack position: Supported central and extension-unit slots must be chosen without exceeding the rack power-supply capacity.
        • Remote limit: The WF705 is not assigned to remote-linked extension racks using IM 308 or IM 318.

        Turning SSI words into PLC position values

        • Encoder word: Each SSI encoder sends a 25-bit Gray-code absolute position word.
        • Module output: The WF705 converts that word and transfers the position to SIMATIC in dual format.
        • Resolution setting: The configured steps per revolution must correspond to the programmed encoder resolution.
        • PLC storage: Requested axis values are placed in the assigned data-block locations for the user program.

        Relating rate, distance and fault checks

        • Fast link: A one-megabit-per-second SSI rate is assigned to cable runs no longer than 25 m.
        • Extended link: The 125-kilobit-per-second setting permits the documented 120 m maximum path.
        • Signal faults: Cable-break and short-circuit monitoring detect an interrupted or invalid encoder connection.
        • Commissioning check: If an axis does not update, compare its request, connector wiring, supply and configured BAUD value.
        Description
        Siemens 6FM1705-3AA00 is the WF705 position decoder module ordered for use in SIMATIC S5 and its extension units. It collects synchronous-serial absolute position values from as many as twelve independent encoder axes and places the converted values in the PLC peripheral data path.

        Encoders can connect directly to 6FM1705-3AA00, in which case their 24 V DC supply is fed through the module, or they can be grouped through actual-value distributors. Each distributor repeats the clock path to as many as three encoders and returns their separate data signals to the WF705.

        SSI data entering 6FM1705-3AA00 uses a 25-bit Gray-code format. The module transfers the measured values to SIMATIC in dual code through a four-byte peripheral address area, so the configured starting address must be a multiple of four.

        Cable length determines the selectable transfer rate on 6FM1705-3AA00: one megabit per second is assigned to runs up to 25 m, while 125 kilobits per second extends the documented path to 120 m. The BAUD parameter must therefore agree with the actual encoder wiring distance.

        Cable-break and short-circuit monitoring on 6FM1705-3AA00 helps distinguish a missing encoder signal from a stationary measured value. During commissioning, the module address, encoder supply, jumper grounding and requested axis must all correspond to the PLC configuration before position data can be interpreted.
        Alternative Names
        6FM17053AA00 6FM1 705-3AA00 6FM1705 3AA00 Siemens 6FM1705-3AA00 WF705 6FM1705-3AA00 SIMATIC S5 6FM1705-3AA00 6FMI705-3AA00 6FM1705-3AAO0
        Technical notes
        Siemens 6FM1705-3AA00 is the SIMATIC S5 WF705 order number; the S7-400 adapter version has a different suffix. Match encoder count, SSI rate and cable length together.
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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 the order-number spacing in the WF705 manual still match 6FM1705-3AA00?
        The ordering table prints 6FM1705-3AA00 as 6FM1 705-3AA00 and assigns it to SIMATIC S5 and extension-unit use.
        Can more than four encoders be connected to 6FM1705-3AA00?
        Yes. For 6FM1705-3AA00, additional axes are grouped through actual-value distributors, with three encoders assigned to each distributor path.
        How should the SSI rate be chosen for 6FM1705-3AA00?
        Set 6FM1705-3AA00 to 1 Mbit/s for runs up to 25 m or 125 kbit/s for the documented maximum of 120 m.
        Which address values are valid for 6FM1705-3AA00 in SIMATIC S5?
        The 6FM1705-3AA00 starting address must lie from PB 4 to PB 252 and be a multiple of four because the module uses four bytes.
        What should be checked when one axis on 6FM1705-3AA00 stops updating?
        For 6FM1705-3AA00, confirm that the axis is requested, the encoder is powered and connected, and cable-break monitoring has not detected a fault.
        Does 6FM1705-3AA00 send Gray code directly into the PLC data block?
        No. 6FM1705-3AA00 receives the 25-bit Gray-code SSI word and transfers the converted position to SIMATIC in dual format.

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