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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power supports 6ES7318-2AJ00-0AB0 with quotations, product manuals, and S7-300 model matching.

        6ES7318-2AJ00-0AB0

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Siemens 6ES7318-2AJ00-0AB0 provides S7-300 program execution and PROFIBUS DP master/slave coordination as the CPU 318-2 DP central processing unit.
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        Ships by Sunday, October 18
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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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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
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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.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 6ES7318-2AJ00-0AB0

        • Manufacturer:
          Siemens
        • Part Number:
          6ES7318-2AJ00-0AB0
        • Product Family:
          Siemens Simatic S7-300
        • Product Type:
          Central Processing Unit
        • Stock:
          1
        • CPU Designation:
          CPU 318-2 DP
        • Work Memory:
          512 KB total
        • Code Memory:
          256 KB
        • Data Memory:
          256 KB
        • Integrated Load Memory:
          64 KB
        • Interface 1:
          MPI/DP, up to 12 Mbit/s
        • Interface 2:
          PROFIBUS DP master/slave
        • DP Address Range:
          2 KB inputs and 2 KB outputs
        • Modules per Rack:
          8 maximum
        • Rack Count:
          4 maximum
        • Accumulators:
          4
        • Operating-Hours Counters:
          8
        • Weight:
          2.22 lbs (1.007 kg)
        • Estimated shipping dimensions:
          17x15.1x12.3cm
        • Tariff Code:
          85371091
        • 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 DP Roles Memory Map Rack Layout Diagnostics

        Features:

        • The CPU 318-2 DP combines S7-300 program processing with two configurable communication interfaces.
        • Code and data receive equal work-memory allocations inside the 512 KB total capacity.
        • Distributed I/O can be managed as a DP master or linked to another controller as a DP slave.
        The processor scans the user program and updates the rack process image while communication jobs use their assigned interfaces.

        Memory-card contents can supply the load image, whereas executable code and current values move through separate working areas.

        Rack expansion retains the S7-300 module layout, with each configured rack limited to eight module positions.

        The Siemens 6ES7318-2AJ00-0AB0 SIMATIC S7-300 CPU 318-2 DP may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 6ES7318-2AJ00-0AB0 SIMATIC S7-300 CPU 318-2 DP 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.

        How the communication roles divide

        • MPI Path: Programming devices and operator stations can share the multipoint interface for engineering and control access.
        • DP Master: The second interface initiates cyclic exchange with configured distributed-I/O slaves.
        • DP Slave: Slave mode exposes assigned input and output areas to a higher-level DP master.
        • Direct Data: Configured direct communication transfers selected I/O data between participating stations without user-block polling.

        Where program information is held

        • Code Space: Program blocks execute from the dedicated half of the work-memory allocation.
        • Data Space: Current process and block data occupy the independent data-memory half.
        • Load Image: Integrated and removable load memory retain blocks before they are copied for execution.
        • Retentive Areas: Configured flags, timers, counters and data blocks determine what survives a restart.

        Central and expansion rack arrangement

        • Central Rack: The CPU occupies the controller rack and exchanges the process image with adjacent S7-300 modules.
        • Expansion Limit: A complete configuration can extend across four racks when interface modules are included.
        • Module Limit: Each rack accepts up to eight configured module positions.
        • Address Assignment: Slot placement and hardware configuration determine the I/O addresses presented to the program.

        Locating a controller or network stop

        • Diagnostic Buffer: Time-ordered events distinguish startup, programming and communication conditions.
        • Module Events: Rack diagnostics identify an inaccessible or faulted configured module.
        • DP Events: Master diagnostics show which distributed station no longer matches or responds to the configuration.
        • Status Blocks: System information can be read by the user program when a diagnostic reaction must be handled in logic.
        Description
        Siemens 6ES7318-2AJ00-0AB0 is the SIMATIC S7-300 CPU 318-2 DP central processing unit, executing the STEP 7 user program while coordinating local rack modules and distributed PROFIBUS devices.

        The CPU divides 512 KB of work memory equally between code and data. Integrated load memory and supported memory cards provide the path from stored program blocks to the working areas used during execution.

        Its first communication interface can operate as MPI or DP, while the second is assigned to PROFIBUS DP master or slave service. This separates programming and operator communication from the distributed-I/O role when the station requires both paths.

        A four-rack S7-300 arrangement can place up to eight modules in each rack. Diagnostic buffers, operating-hours counters and interface status information help identify whether a stopped process originates in program execution, rack access or the DP connection.
        Alternative Names
        6ES73182AJ000AB0 6ES7 318-2AJ00-0AB0 6ES7 318 2AJ00 0AB0 Siemens 6ES7318-2AJ00-0AB0 CPU 318-2 DP SIMATIC S7-300 6ES7318-2AJ00-0AB0 6ES7318-2AJ00-0AB0 Central Processing Unit 6ES731B-2AJ00-0AB0
        Technical notes
        The Siemens 6ES7318-2AJ00-0AB0 combines 512 KB work memory with two integrated communication interfaces. Its second interface supports PROFIBUS DP master or slave operation.
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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
        When should the second interface of 6ES7318-2AJ00-0AB0 be configured as a DP master rather than a DP slave?
        Configure 6ES7318-2AJ00-0AB0 as master when it must poll distributed I/O; use slave mode when another controller owns the DP cycle.
        Why does a replacement 6ES7318-2AJ00-0AB0 need its memory-card and project details checked first?
        The executable blocks, hardware configuration and retentive settings of 6ES7318-2AJ00-0AB0 depend on the stored STEP 7 project and selected memory medium.
        How can an engineer separate a rack fault from a PROFIBUS fault on 6ES7318-2AJ00-0AB0?
        Review the diagnostic buffer and interface status of 6ES7318-2AJ00-0AB0, then compare missing rack modules with the reported DP station event.
        What limits apply when expanding an S7-300 station around 6ES7318-2AJ00-0AB0?
        A configuration around 6ES7318-2AJ00-0AB0 can use up to four racks, with no more than eight configured modules in each rack.
        Can programming traffic and distributed I/O use separate paths on 6ES7318-2AJ00-0AB0?
        Yes. 6ES7318-2AJ00-0AB0 can keep MPI or programming communication on the first interface while the second handles PROFIBUS DP.
        Before an old CPU 318-2 DP project is loaded, which 6ES7318-2AJ00-0AB0 details require matching?
        Verify the hardware release, firmware selection, memory-card capacity and STEP 7 hardware entry for 6ES7318-2AJ00-0AB0 before loading the project.

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