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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power can coordinate quotations, manuals, model matching, and product selection for 6ES5945-7UA23.

        6ES5945-7UA23

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        1001 reviews ｜ Need a Specific Revision?
        Siemens 6ES5945-7UA23 is a SIMATIC S5-115U CPU 945 central controller module that executes the PLC program and coordinates rack I/O with 384 KB memory.
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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 6ES5945-7UA23

        • Manufacturer:
          Siemens
        • Part Number:
          6ES5945-7UA23
        • Product Family:
          Siemens Simatic S5
        • Product Type:
          SIMATIC S5-115U CPU 945 Central Controller Module
        • Stock:
          1
        • Memory Capacity:
          384 KB
        • Memory Type:
          Internal memory with memory-submodule provision
        • Additional Interface Slot:
          Available
        • Scan Monitoring:
          Approximately 500 ms, adjustable
        • Timers:
          256 maximum
        • Counters:
          256 maximum
        • Digital I/O Address Capacity:
          8192 total
        • Analog Input Capacity:
          256 maximum
        • Analog Output Capacity:
          256 maximum
        • Program Blocks:
          256 maximum
        • Function Blocks:
          512 maximum
        • Data Blocks:
          512 maximum
        • Weight:
          1.8078 lbs (0.82 kg)
        • Estimated shipping dimensions:
          31.2x21.5x5.2cm
        • 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 Program Cycle Memory Blocks I/O Addressing CPU Status

        Features:

        • CPU 945 processing executes the control program within a SIMATIC S5-115U rack.
        • A 384 KB memory configuration stores program and operating data.
        • Timers, counters and block structures organize cyclic PLC execution.
        The processor reads the configured input image, executes logic and updates outputs through the rack system.

        Memory and block capacity define how control routines and process values are arranged.

        Scan monitoring and CPU indicators provide separate checks for execution state and hardware status.

        The Siemens 6ES5945-7UA23 SIMATIC S5 CPU 945 Controller may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Siemens 6ES5945-7UA23 CPU 945 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.

        Relating I/O data to CPU execution

        • Input phase: Configured field states enter the CPU process image through the S5 rack.
        • Logic phase: The CPU 945 executes the stored blocks against the current process data.
        • Output phase: Program results are transferred to the addressed output image.
        • Watchdog: Scan monitoring checks that the cyclic program completes inside the configured time.

        Organizing code and retained process data

        • Program blocks: Up to 256 program blocks divide the main control sequence.
        • Function blocks: Up to 512 FB/FX blocks hold reusable routines with assignable parameters.
        • Data blocks: Up to 512 DB/DX blocks store process and program values.
        • Working memory: The 384 KB configuration provides the memory space for this controller version.

        Mapping rack signals into the control program

        • Digital range: The CPU addresses the configured digital input and output space.
        • Analog range: Analog input and output addresses remain distinct from digital points.
        • Rack relationship: Address assignments must match the physical S5-115U hardware configuration.
        • Program reference: Logic uses those configured addresses to read field states and issue commands.

        Distinguishing processor state from connected-system faults

        • RUN state: The run indication shows that the CPU is executing its program cycle.
        • STOP state: A stop condition halts normal cyclic program execution.
        • Interface path: An optional interface module provides a separate communication expansion point.
        • Fault tracing: CPU, interface and I/O indications are checked separately before a module is replaced.
        Description
        Within a SIMATIC S5-115U rack, Siemens 6ES5945-7UA23 is the CPU 945 central controller module that executes the stored control program and coordinates process data between the processor and configured I/O.

        The 384 KB memory of 6ES5945-7UA23 holds the program and working data used during the controller scan. Timers, counters and the different block types organize logic, retained values and reusable control routines inside that execution cycle.

        Digital and analog addresses handled by 6ES5945-7UA23 map the rack and connected I/O into the CPU program. An optional interface module can occupy the additional interface position when the documented S5 configuration requires another communication path.

        Scan monitoring on 6ES5945-7UA23 supervises the time taken by the cyclic program. CPU status indicators and operating controls then separate processor state from an I/O or communication condition during commissioning.
        Alternative Names
        6ES59457UA23 6ES5945 7UA23 6ES5 945-7UA23 Siemens 6ES59457UA23 CPU 945 6ES5945-7UA23 SIMATIC S5-115U 6ES5945-7UA23 6ES5945-7UA2S 6ES594S-7UA23
        Technical notes
        Siemens 6ES5945-7UA23 combines the CPU 945 processing section, 384 KB memory and the S5-115U rack interface that coordinates the control program with configured I/O.
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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
        What role does Siemens 6ES5945-7UA23 perform in an S5-115U rack?
        Siemens 6ES5945-7UA23 is the CPU 945 central controller that executes the PLC program and coordinates configured rack I/O. It is not an input, output or power-supply module.
        Why does the 384 KB value matter when matching 6ES5945-7UA23?
        The 384 KB configuration is part of the exact 6ES5945-7UA23 controller identity and determines its program and working-memory capacity. A CPU 945 with another memory variant is not the same complete order number.
        A replacement 6ES5945-7UA23 enters STOP; which relationships should be checked first?
        For 6ES5945-7UA23, compare the restored program, rack hardware configuration, I/O addresses and any installed interface module. A processor can remain in STOP when its project does not match the physical system.
        How does scan monitoring affect operation of 6ES5945-7UA23?
        Scan monitoring on 6ES5945-7UA23 checks whether the cyclic program completes inside the configured time. An overrun points to program execution or system conditions rather than directly proving an I/O channel fault.
        Can the additional interface position on 6ES5945-7UA23 replace normal rack I/O?
        No. The additional interface position of 6ES5945-7UA23 expands communication when the documented S5 configuration requires it, while rack I/O remains mapped through its own configured addresses.
        Which details distinguish 6ES5945-7UA23 from another CPU 945 listing?
        Use the full 6ES5945-7UA23 order number, the S5-115U system assignment and the 384 KB configuration together. The CPU 945 family name alone does not identify every memory and interface variant.

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