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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Product manuals, quotations, and system-matching guidance for 6ES7478-2AC00-0AC0 are available from Apter Power.

        6ES7478-2AC00-0AC0

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Siemens 6ES7478-2AC00-0AC0 is a SIMATIC M7-400 EXM 478 expansion module that adds mounting and bus access for as many as three interface submodules.
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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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        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 6ES7478-2AC00-0AC0

        • Manufacturer:
          Siemens
        • Part Number:
          6ES7478-2AC00-0AC0
        • Product Family:
          Siemens Simatic S7-400
        • Product Type:
          SIMATIC M7-400 EXM 478 Expansion Module
        • Stock:
          1
        • Interface Submodule Capacity:
          Up to 3
        • Expansion Connection:
          120-pin connector at left and 120-pin socket at right
        • Internal Bus:
          ISA bus
        • I/O Address Window:
          256 bytes per expansion module
        • Interrupt Resources:
          Up to 3 interrupts per interface submodule
        • Interrupt Handling:
          Individual or shared signaling depending on interface submodule
        • Supply Voltage:
          5 V DC from the module system
        • Current Consumption:
          0.2 A
        • Power Loss:
          0.5 W
        • Permitted Module Power:
          10 W without forced ventilation; 12 W with forced ventilation
        • Operating Temperature:
          0 to +60 °C within configured ventilation limits
        • Station Integration:
          SIMATIC M7-400 expansion stack
        • Addressing Method:
          Hardware-position-dependent expansion address area
        • Weight:
          1.433 lbs (0.65 kg)
        • 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 Submodule Slots Bus & Addressing Interrupt Routing Power & Ventilation

        Features:

        • Three interface-submodule positions expand communication or signal interfaces in an M7-400 station.
        • Left and right 120-pin connections continue the expansion path through the module stack.
        • ISA-bus addressing, 256-byte windows, and configurable interrupt handling organize submodule access.
        Siemens 6ES7478-2AC00-0AC0 is the EXM 478 expansion module for adding up to three interface submodules to a SIMATIC M7-400 configuration.

        Its pass-through connectors continue the expansion bus, while each installed expansion module receives a defined 256-byte M7-400 I/O window.

        Submodule interrupts, module order, address allocation, and the permitted power load must be engineered together, especially when the station operates without forced ventilation.

        The Siemens 6ES7478-2AC00-0AC0 SIMATIC M7-400 EXM 478 Expansion Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 6ES7478-2AC00-0AC0 SIMATIC M7-400 EXM 478 Expansion 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.

        Interface Expansion Capacity

        • Slot count: The EXM 478 accepts as many as three interface submodules.
        • Left connection: A 120-pin connector receives the expansion path from the neighboring module.
        • Right connection: A 120-pin socket continues the expansion path to the next module.
        • Assembly check: Submodule type, seating, and module order must match the documented M7-400 configuration.

        Expansion-Bus Resource Assignment

        • Bus architecture: Interface submodules communicate through the ISA bus.
        • Address space: Each expansion module receives a 256-byte I/O address window.
        • Module sequence: Hardware order determines how the expansion address areas are assigned.
        • Project match: Software addresses must agree with the physical EXM and submodule arrangement.

        Submodule Event Signaling

        • Interrupt capacity: An interface submodule can provide as many as three interrupt requests.
        • Individual signaling: Supported submodules can route defined events separately.
        • Shared signaling: Multiple events may use a common interrupt depending on the submodule design.
        • Diagnostic boundary: The source submodule, interrupt assignment, software handler, and physical slot should be checked together.

        Module Load Limits

        • Supply: The expansion module operates from the 5 V DC module-system supply.
        • Own consumption: Current consumption is 0.2 A with 0.5 W power loss.
        • Passive limit: Installed submodules may total up to 10 W without forced ventilation.
        • Forced-air limit: The permitted installed load rises to 12 W when the specified ventilation is provided.
        Description
        Siemens 6ES7478-2AC00-0AC0 extends an M7-400 station with three interface-submodule positions. A 120-pin connector on the left and a matching socket on the right pass the expansion connection through the module stack.

        The interface submodules fitted to 6ES7478-2AC00-0AC0 use the ISA bus and an M7-400-specific I/O address range. Each expansion module occupies a 256-byte address window, so address allocation must follow the configured hardware sequence.

        Interrupts from the submodules on 6ES7478-2AC00-0AC0 can be evaluated individually or through shared signaling, depending on the interface hardware. Module power, ventilation limits, connector seating, and interrupt assignments must all be checked before the station returns to service.
        Alternative Names
        6ES74782AC000AC0 6ES7478 2AC00 0AC0 Siemens 6ES7478-2AC00-0AC0 EXM 478 expansion module M7-400 interface submodule carrier 6ES7478-2AC00-0AC0 expansion board SIMATIC M7-400 EXM478 6ES7478-2AC00-0AC0 ISA expansion module
        Technical notes
        Up to three interface submodules fit Siemens 6ES7478-2AC00-0AC0, which extends the M7-400 bus through 120-pin connectors and assigns each expansion module a 256-byte I/O window.
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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
        How many interface submodules can be installed in 6ES7478-2AC00-0AC0?
        Siemens 6ES7478-2AC00-0AC0 accepts up to three interface submodules, provided their types, power demand, address assignment, and cooling conditions fit the documented M7-400 configuration.
        Why does the physical order of 6ES7478-2AC00-0AC0 matter?
        The module sequence around 6ES7478-2AC00-0AC0 affects the expansion connection and I/O address windows, so software addressing must match the actual assembled order.
        What causes an interface submodule on 6ES7478-2AC00-0AC0 to be unreachable?
        Check seating, 120-pin pass-through connections, slot position, the 256-byte address window, ISA-bus configuration, and the exact submodule type installed on 6ES7478-2AC00-0AC0.
        Can any three interface submodules be fitted to 6ES7478-2AC00-0AC0 without a power check?
        No. For 6ES7478-2AC00-0AC0, total submodule power is limited to 10 W without forced ventilation or 12 W with the specified ventilation.
        How should missing interrupts from 6ES7478-2AC00-0AC0 be diagnosed?
        Verify the interface-submodule interrupt capabilities, individual or shared routing, hardware slot, software handler, and event source associated with 6ES7478-2AC00-0AC0.
        What must be recorded before removing 6ES7478-2AC00-0AC0?
        Record the 6ES7478-2AC00-0AC0 position, neighboring modules, installed submodules, connector orientation, addresses, interrupt assignments, and ventilation arrangement before dismantling the station.

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