Features:
- The CPU 948 executes the control program inside a SIMATIC S5-155U rack.
- A plug-in user-memory carrier keeps the program medium separate from the processor hardware.
- Front controls and indicators expose operating, program and interface conditions.
The processor exchanges rack data while maintaining the current program execution state.
Programming access reaches the CPU through its dedicated front connection.
Auxiliary interface positions and status lamps help isolate a communication condition from a selected STOP state.
The Siemens 6ES5948-3UA23 SIMATIC S5-155U CPU 948 may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES5948-3UA23 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 processor RAM from the program carrier
- Working memory: The CPU uses its installed RAM while executing the controller program.
- User-memory slot: A removable memory submodule occupies the dedicated front position.
- Exchange handling: The existing memory carrier must be identified before replacing the processor.
- Program boundary: A CPU exchange does not automatically reproduce the contents of a missing user-memory module.
Relating the front controls to CPU operation
- RUN selection: The mode switch permits program execution when the controller conditions are satisfied.
- STOP selection: The selected STOP state halts execution without identifying the reason for every fault.
- Reset control: Reset operation follows the documented S5 procedure for the processor.
- State check: Indicator status must be read together with the selected mode and installed memory.
Using the programming connection without mixing interface roles
- PG connector: The 15-pin front interface provides the programming-device connection.
- Service path: Program transfer and online diagnostics use that dedicated access point.
- Auxiliary positions: SI1 and SI2 are separate interface locations with their own assignments.
- Connection check: The cable and interface role must be identified before an online session is attempted.
Interpreting local processor conditions
- Operating state: RUN and STOP indications reflect the current CPU mode.
- Program condition: CPU fault lamps distinguish processing problems from normal execution.
- Interface state: Separate indicators correspond to the documented serial interface paths.
- Diagnostic sequence: Read the front pattern before moving memory or changing the operating mode.