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6ES5948-3UA13

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As the central processor in a SIMATIC S5-155U rack, Siemens 6ES5948-3UA13 executes STEP 5 programs in single- or multiprocessor systems.
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Technical specifications for 6ES5948-3UA13

  • Manufacturer:
    Siemens
  • Part Number:
    6ES5948-3UA13
  • Product Family:
    Siemens Simatic S5
  • Product Type:
    S5-155U CPU 948 Central Processing Unit
  • Stock:
    1
  • Integrated User Memory:
    640 KB RAM
  • Supply Voltage:
    5 V ±5%
  • Typical Current Consumption:
    3.6 A
  • Backup Voltage:
    3.4 V
  • Typical Backup Current:
    10 µA at 25 °C
  • Digital Inputs with Process Image:
    1024 maximum
  • Digital Outputs with Process Image:
    1024 maximum
  • Digital Inputs without Process Image:
    7168 maximum
  • Digital Outputs without Process Image:
    7168 maximum
  • Flags:
    2048 bytes
  • S Flags:
    32768
  • Timers:
    256
  • Counters:
    256
  • Serial PG Rate:
    9600 bit/s
  • Program Blocks:
    256
  • Sequence Blocks:
    256
  • Function Blocks:
    256
  • Function Blocks FX:
    256
  • Data Blocks:
    256
  • Organization Blocks:
    OB 1 to 39 plus interrupt blocks
  • Backplane Bus:
    S5 bus
  • Programming Interface:
    PG interface with PG submodule
  • Weight:
    1.0362 lbs (0.47 kg)
  • Estimated shipping dimensions:
    21.3x26.7x3.4cm
  • 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 Memory Structure Block Processing Rack Exchange Engineering Access

Features:

  • The CPU 948 executes STEP 5 programs in S5-155U single- or multiprocessor racks.
  • Integrated RAM, memory-card storage, and backup power serve separate program-retention roles.
  • PG, optional serial, and S5 backplane interfaces connect engineering, communication, and I/O paths.
The operating system executes cyclic and interrupt-driven blocks from active memory.

The rack bus exchanges process-image data with modules and coordinates multiple CPUs.

Startup evidence links memory, backup, slot assignment, supply, and program state.

The Siemens 6ES5948-3UA13 S5-155U CPU 948 may remain available for quotation and support beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES5948-3UA13 S5-155U CPU 948 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.

Separating active execution from stored recovery data

  • User RAM: The 640 KB memory holds active STEP 5 program and data content.
  • Memory card: Non-volatile load information can be retained outside working RAM.
  • Backup path: The backup circuit preserves assigned RAM content when rack power is removed.
  • Archive: A verified STEP 5 project remains the external source for controlled recovery.

Scheduling the S5 program around operating-system events

  • Cyclic blocks: The main control sequence repeats through the assigned organization structure.
  • Timed events: Configured time bases call their associated program sections.
  • Process interrupts: Field events invoke the corresponding interrupt organization blocks.
  • Stop handling: Program and hardware conditions can move the CPU into the defined stop sequence.

Moving I/O and coordination data through the S5 bus

  • Process image: Input and output values are exchanged with signal modules through the backplane.
  • Direct areas: Additional addresses operate outside the ordinary cyclic image.
  • Multiprocessor role: Several CPUs divide assigned tasks in the same central controller.
  • Slot assignment: Every processor and submodule remains in the position defined by the system project.

Connecting program tools and optional communication hardware

  • PG interface: A programming device reaches the CPU through the assigned PG path.
  • Second interface: The optional submodule supplies the documented serial or communication service.
  • Online comparison: Project blocks are checked against the active CPU contents.
  • Recovery test: Program load, run transition, I/O exchange, and retained data are verified together.
Description
Siemens 6ES5948-3UA13 is the 640 KB CPU 948 central processing unit for SIMATIC S5-155U automation systems. It executes STEP 5 control programs and can operate as the controller processor in either a single-CPU or multiprocessor rack configuration.

The RAM inside 6ES5948-3UA13 holds active blocks and data, while a SIMATIC S5 memory card provides the non-volatile load-memory path used for program storage and recovery. The operating system schedules cyclic, timed, interrupt-driven, and software-stop processing across program, function, data, and organization blocks.

A PG interface on 6ES5948-3UA13 connects engineering equipment, and the second interface position accepts the documented communication or serial submodule. The S5 backplane moves process-image data and coordination information between the CPU, signal modules, and other processors assigned to the central controller.

Startup of 6ES5948-3UA13 depends on the correct rack slots, backplane connection, 5 V supply, memory contents, and backup path. Front controls and LEDs show run, stop, reset, and fault states, allowing a memory or program problem to be separated from supply and rack communication faults.
Alternative Names
6ES59483UA13 6ES5 948-3UA13 6ES5948 3UA13 Siemens 6ES5948-3UA13 6ES5948-3UA13 CPU 948 CPU 948 6ES5948-3UA13 6ES 5948 3UA13 6ES5948/3UA13
Technical notes
A replacement Siemens 6ES5948-3UA13 requires the STEP 5 archive, RAM and memory-card contents, PG interface plan, rack slot, backup circuit, and multiprocessor assignment.
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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.
What must accompany a spare Siemens 6ES5948-3UA13?
Keep the Siemens 6ES5948-3UA13 STEP 5 archive, memory-card contents, CPU and submodule revisions, rack slot map, backup record, and multiprocessor assignment.
Why does 6ES5948-3UA13 lose program data after power-off?
Inspect the 6ES5948-3UA13 backup voltage, battery or backup source, memory mode, RAM condition, card contents, and whether the intended blocks were stored non-volatilely.
Can Siemens 6ES5948-3UA13 run in a multiprocessor S5-155U rack?
Yes. Siemens 6ES5948-3UA13 supports single- and multiprocessor operation when rack slots, bus coordination, program division, and system configuration agree.
How is a PG connection problem diagnosed on 6ES5948-3UA13?
Check the 6ES5948-3UA13 PG interface, cable, submodule, transmission settings, CPU operating state, port selection, and whether another configured path owns the interface.
Why will Siemens 6ES5948-3UA13 not leave STOP after memory reset?
Read the Siemens 6ES5948-3UA13 LEDs, confirm supply and backup, load the approved program and configuration, verify rack partners, then review startup diagnostics.

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