Description
1. At-A-Glance Executive Brief
- Model: 6ES5948-3UR23
- Brand: Siemens
- Part Type: Central Processing Unit (CPU 948R)
- System Compatibility: SIMATIC S5-155H PLC rack
- Lifecycle Status: Discontinued / Mature Legacy
- Weight: 0.46 kg
2. Technical Introduction
The Siemens SIMATIC S5-155H architecture relies heavily on high-speed central processing units to manage critical process control tasks and redundant safety operations. When an active processor fails in a legacy continuous-process facility, plant downtime translates directly into severe production losses.
The 6ES5948-3UR23 CPU 948R delivers 1600 KB of onboard RAM, engineered specifically to handle extensive user logic, complex I/O mapping, and synchronized dual-processor configurations without performance degradation. Sourcing verified replacement hardware prevents the extensive capital expenditure associated with a forced legacy system migration.
Engineer’s Takeaway: Maintaining a tested, drop-in replacement CPU 948R on site is the single most effective insurance policy against extended downtime in aging S5-155H rack setups.
3. Core Technical Specifications
- Manufacturer: Siemens
- Product Family: SIMATIC S5
- Module Type: CPU 948R Central Processing Unit
- System Series: S5-155H
- RAM Capacity: 1600 KB
- Product Lifecycle Phase: PM410 (Product Cancellation)
- Net Weight: 0.463 kg
- Environmental Tolerances: Please refer to the OEM datasheet for complete environmental tolerances.
4. Field Engineer’s Tech Notes
- Lithium Backup Battery Management: Never hot-swap this CPU without verifying the state of the internal lithium backup battery or external power RAM module. A depleted battery combined with a power loss during installation will instantly wipe volatile user programs and retentive data blocks.
- Firmware and EPROM Version Matching: When replacing a failed unit in a redundant S5-155H setup, ensure the firmware revision and sub-slot memory submodules match the active partner CPU. Asymmetrical firmware versions can cause synchronization faults and trigger an immediate controller trip.
5. Adaptive QA & Testing Protocol
Every unit undergoes rigorous bench testing before leaving our facility. Technicians clear internal RAM, perform a comprehensive battery voltage check, and execute a cold-start diagnostic cycle to verify internal register stability and bus communication handshakes. We stress-test the backplane interface pins for oxidation or wear and run prolonged logic execution loops to simulate real-world plant loads. Complete functional test reports and verification videos are available upon request prior to dispatch.
6. Buyer’s FAQ
- What warranty is provided for this legacy CPU?All New Surplus and fully refurbished units come with a comprehensive 12-month operational warranty covering all hardware functions.
- Are these units shipped in anti-static packaging?Yes. Every module is sealed in industrial-grade antistatic shielding and packed in dense foam containment to prevent electrostatic discharge and transit shock.
- Is this a direct drop-in replacement for older revisions?The 6ES5948-3UR23 is designed to replace matching S5-155H processor nodes, but verify your rack’s backplane configuration and firmware dependencies before commissioning.
- What are your typical dispatch lead times for urgent requirements?Emergency same-day dispatch options are available for in-stock inventory to minimize plant downtime during unplanned outages.
