SIEMENS CPU 947 Central Processing Unit module Description
Siemens SIMATIC S5 CPU 947 Central Processing Unit Module (6ES5947-3UA22). This high-performance central unit is engineered exclusively for Siemens SIMATIC S5-155U programmable logic controller (PLC) systems to handle complex, large-scale industrial automation logic and process control.
Manufacturer Name: Siemens
Product Series & Classification: SIMATIC S5 Automation System, CPU 947 Central Unit Module
Manufacturer Part Number (MLFB): 6ES5947-3UA22
Target PLC System Compatibility: Designed specifically for installation within modular SIMATIC S5-155U and S5-155H rack configurations (in close co-processing combination with the CPU 946 module)
Onboard Memory Capacity: Integrated 896 KB RAM dedicated internal memory for heavy user program block storage and runtime execution
Programming Interface Node: Front-facing 15-pin D-Sub port optimized for dedicated Siemens TTY/PG connection and Siemens legacy STEP 5 software programming
Country of Origin: Made in Germany (DE)
Product Lifestyle Notice: This is a legacy automation component that has officially reached its end-of-life (EOL) phase from the manufacturer
If you want to more details about SIEMENS CPU 947 Central Processing Unit module，please contact me without hesitate.Email：sales@sparecenter.com
SIEMENS 6ES5947-3UA22 Application Cases
Steel & Metallurgy Plant Upgrades
SIEMENS CPU 947 Central Processing Unit module was widely integrated into Siemens SIMATIC S5-155U setups to run heavy-duty blast furnaces and automated raw material batching lines. Working alongside a CPU 946 co-processor, the CPU 947 (6ES5947-3UA22) relied on its 896 KB internal RAM to crunch complex, multi-loop PID algorithms. This architecture successfully handled massive analog I/O counts and kept high-temperature smelting lines running around the clock without interruption.
Chemical & Process Control Systems
Engineers deployed SIEMENS CPU 947 Central Processing Unit module within high-availability SIMATIC S5-155H fault-tolerant platforms to control chemical distillation columns and manage safety interlocks. Running inside a dual-rack, hardware-level hot-standby system, the CPU 947 processed critical data blocks in real time. This quick processing enabled instant, bumpless switchovers during hardware faults, saving continuous chemical production lines from expensive unexpected shutdowns.
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SIEMENS 6ES5947-3UA22 FAQ
Q: Where exactly does this 6ES5947-3UA22 SIEMENS card go?
A: This is a CPU 947 processor board. You only drop the 6ES5947-3UA22 SIEMENS into modular Siemens SIMATIC S5 hardware racks, specifically the S5-155U or S5-155H fault-tolerant versions. It won't fit or boot up in smaller S5 chassis setups.
A: This is a CPU 947 processor board. You only drop the 6ES5947-3UA22 SIEMENS into modular Siemens SIMATIC S5 hardware racks, specifically the S5-155U or S5-155H fault-tolerant versions. It won't fit or boot up in smaller S5 chassis setups.
Q: Can I run a backup system using just one SIEMENS 6ES5947-3UA22 module?
A: No, you can't use the 6ES5947-3UA22 SIEMENS as a standalone main processor. Siemens built this specific hardware card to run as a subassembly co-processor. In a live panel, the 6ES5947-3UA22 SIEMENS has to sit right next to a master CPU 946 unit so they can handle the heavy computing load together.
A: No, you can't use the 6ES5947-3UA22 SIEMENS as a standalone main processor. Siemens built this specific hardware card to run as a subassembly co-processor. In a live panel, the 6ES5947-3UA22 SIEMENS has to sit right next to a master CPU 946 unit so they can handle the heavy computing load together.
Q: What is the true onboard memory size for the SIEMENS 6ES5947-3UA22?
A: The total internal RAM baked onto the 6ES5947-3UA22 SIEMENS board is exactly 896 KB. That space is strictly utilized for holding large STEP 5 code blocks, tracking data tags, and maintaining active machine variables during live processing loops.
A: The total internal RAM baked onto the 6ES5947-3UA22 SIEMENS board is exactly 896 KB. That space is strictly utilized for holding large STEP 5 code blocks, tracking data tags, and maintaining active machine variables during live processing loops.
Q: What cable connection do I need to hook up to the 6ES5947-3UA22 SIEMENS front port?
A: Look at the front face of your SIEMENS 6ES5947-3UA22 card—you will see a standard 15-pin D-sub female socket. That's a classic Siemens TTY/PG communication node. You hook your old programming terminal up there when you need to load STEP 5 logic or trace live system faults.
A: Look at the front face of your SIEMENS 6ES5947-3UA22 card—you will see a standard 15-pin D-sub female socket. That's a classic Siemens TTY/PG communication node. You hook your old programming terminal up there when you need to load STEP 5 logic or trace live system faults.
Q: Is Siemens still selling brand-new factory 6ES5947-3UA22 SIEMENS stock?
A: Absolutely not, Siemens discontinued this line years ago. However, you can source the 6ES5947-3UA22 SIEMENS(SIEMENS 6ES5947-3UA22) directly from our spare center, where we stock fully inspected and reliable replacement units to help you avoid production downtime.
A: Absolutely not, Siemens discontinued this line years ago. However, you can source the 6ES5947-3UA22 SIEMENS(SIEMENS 6ES5947-3UA22) directly from our spare center, where we stock fully inspected and reliable replacement units to help you avoid production downtime.
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Email: sales@sparecenter.com
