The Siemens 6ES5948-3UR23 is a CPU 948R Central Processing Unit (CPU) designed for the SIMATIC S5-155H modular PLC system. It serves as the control core for industrial automation applications requiring high reliability and advanced processing capabilities. Below is a detailed technical overview compiled from Siemens’ historical documentation and industry records:
- Product Series: SIMATIC S5 (part of the S5-155H redundant PLC system)
- Module Type: High-performance CPU with redundancy support
- Product Status: Obsolete/Discontinued (replaced by modern SIMATIC S7-400H systems)
- Key Function: Executes control programs, manages I/O operations, and enables redundancy in critical industrial processes
The CPU 948R is engineered for mission-critical industrial applications where downtime is unacceptable. Its key roles include:
- Redundancy Management:
- Operates in dual-CPU configurations (e.g., CPU 948R + CPU 948R) to ensure continuous operation if one CPU fails.
- Real-time synchronization of program states and data between redundant CPUs.
- Process Control:
- Handles complex logic, analog signal processing, and up to 8 PID control loops.
- Supports high-speed counting and positioning via expansion modules.
- Communication:
- Connects to HMIs (e.g., Siemens OP panels), drives, and other PLCs via PROFIBUS-FMS or MPI.
- Enables integration with higher-level systems (e.g., SCADA) for centralized monitoring.
典型应用场景:
- Power generation plants
- Oil and gas refineries
- Pharmaceutical manufacturing
- Automotive assembly lines
- Water treatment facilities
- Hardware Redundancy:
- The CPU 948R is part of the SIMATIC S5-155H redundant system, which uses two identical CPUs (primary and standby) connected via a redundant backplane bus.
- In case of a CPU failure, the standby unit takes over within milliseconds, ensuring minimal disruption.
- Redundant I/O Support:
- Works with redundant I/O modules (e.g., 6ES5 460-8MA11) to create fault-tolerant input/output channels.
- Diagnostics:
- Built-in LED indicators for power, CPU status, and communication errors.
- Error logging and self-testing capabilities for proactive maintenance.
As the S5-155H system is obsolete, Siemens recommends migrating to the SIMATIC S7-400H series, which offers:
- Higher processing power and memory capacity.
- Seamless integration with TIA Portal engineering software.
- Enhanced redundancy features (e.g., hot-standby with automatic failover).
Recommended Replacement Models:
- S7-400H CPU: 6ES7 417-4HT14-0AB0 (supports S7 redundancy and PROFIBUS/PN communication).
- Redundant I/O: ET 200M with IM 153-2 modules for PROFIBUS DP redundancy.
- Legacy Manuals: Technical guides like "SIMATIC S5-155H System Manual" and "CPU 948R Hardware Manual" are available via Siemens’ legacy documentation archive.
- Third-Party Support: Specialized suppliers (e.g., NewGenPLC) offer refurbished 6ES5948-3UR23 modules and migration services.
- Programming Tools: Requires S5-SAT or STEP 7 V5.5 (not compatible with TIA Portal).
- Spare Parts: Limited availability; plan for system modernization to avoid future downtime.
- Environmental Compliance: Meets CE and UL standards for industrial use.
For assistance with migration planning or troubleshooting, contact Siemens Industrial Support or a certified automation partner.
