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      6DD1681-0AG2

      Relay Output Module
      In Stock
      Ships by Saturday, November 7
      Fast Shipping Available
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      Siemens 6DD1681-0AG2 is an SB70 relay interface module with eight isolated digital output channels. Its contacts adapt controller outputs for plant circuits up to 120 V AC or DC.

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      Technical specifications for 6DD1681-0AG2

      • Manufacturer:
        Siemens
      • Product Category:
        DCS Systems
      • Spare Part Number:
        6DD1681-0AG2
      • Estimated shipping dimensions:
        4.5x15.9x12.9cm
      • Weight:
        0.36 kg
      • Tariff Code:
        8537101190
      • Counliy of origin:
        Germany
      • Designation:
        SB70
      • Output channels:
        8 digital relay outputs
      • Maximum output voltage:
        120 V AC or DC
      • Isolation:
        Relay isolation between input and output
      • X1:
        8 digital-input pins plus 1P and 1M
      • X2:
        2 x 12-pole terminals
      • Contact terminals:
        8 NO, 8 NC and 8 common terminals
      • X3 supply:
        +24 V at 1P; 0 V at 1M
      • Diagnostics:
        LED displays and X5 test socket
      • Protection:
        PTC thermistor downstream of controller-side supply
      View as PDF Ask for Quote

      Information

      Overview Manuals Common Applications Product Precautions
      Between controller logic and plant loads, Siemens 6DD1681-0AG2 uses changeover relay contacts, requiring separate checks of the controller-side 24 V supply and each field contact circuit.
      • Eight relay output channels
      • Electrical isolation by relays
      • Up to 120 V AC or DC
      • NO, NC and common terminals

      The controlled engineering path is SIMATIC TDC / FM 458-1 DP outputs → SC62 interface cable → SB70 relay isolation → Plant control circuits; preserve the approved system record and verify the intended final response before release.

      Important Notice: Check contact voltage, NO/NC/common selection and circuit protection before returning any relay output to service.

      Siemens 6DD1681-0AG2 Manuals & Downloads
      Siemens 6DD1681-0AG2 Official Technical Reference Excerpt (PDF)Siemens 6DD1681-0AG2 Installation & Commissioning Guide (PDF)

      Important Notice: The official Siemens hardware manual documents the SB70 relay interface and its connections; the ApterPower guide provides a separate exact-model field sequence for preparation, connection checks, functional proving and acceptance.

      Voltage-level adaptation
      Interface controller outputs with higher-voltage plant circuits.
      Dry-contact switching
      Use changeover contacts for controlled output routing.
      Electrical separation
      Isolate controller logic from connected output circuits through relays.
      Cabinet maintenance
      Replace an SB70 while preserving channel and contact mapping.
      Apply these exact-model controls to Siemens 6DD1681-0AG2 before isolation, replacement, reconnection, energization and final release.
      1
      Isolate controller and plant-side voltages before touching X1, X2 or X3.
      2
      Verify that every connected field circuit is within the 120 V AC/DC limit.
      3
      Identify NO, NC and common terminals separately for each channel.
      4
      Confirm the X3 24 V polarity before applying controller-side power.
      5
      Use the specified SC62 cable and check ribbon orientation.
      6
      Do not bridge the relay isolation with unintended commons or test leads.
      7
      Compare LED indication with measured contact operation on all channels.
      8
      Document the final contact assignment and functional-test result.

      Technical notes

      The SB70 relay interface separates field circuits through relay contacts. Confirm each NO/NC/common assignment, circuit voltage and protective device before energization.

      FAQ View All FAQ

      • How many relay outputs are provided by Siemens 6DD1681-0AG2?
        The SB70 provides eight relay-isolated digital output channels.
      • What field-circuit voltage range can Siemens 6DD1681-0AG2 switch?
        The documented maximum is 120 V AC or DC.
      • Which NO, NC and common terminals are available at X2 on Siemens 6DD1681-0AG2?
        Each channel provides normally open, normally closed and common terminals.
      • How does Siemens 6DD1681-0AG2 isolate controller and field circuits?
        Relays isolate the controller-side inputs from the output contact circuits.
      • How is the SIMATIC-side supply delivered to Siemens 6DD1681-0AG2?
        X3 receives +24 V at 1P and 0 V at 1M.
      • Which connection cable pairs Siemens 6DD1681-0AG2 with controller components?
        Siemens specifies the SC62 interface cable.
      • Which protection device guards the controller-side supply path of Siemens 6DD1681-0AG2?
        A PTC thermistor provides line protection downstream of the SIMATIC-side supply.
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