The SIEMENS SIMATIC PCS 7 CPU 410 Redundancy Automation System, model 6ES7656-6CL33-7AF0, is a cornerstone of modern process automation, engineered for mission-critical applications where system availability is paramount. This CPU 410 redundancy module integrates seamlessly into the PCS 7 ecosystem, providing a hot-standby architecture that automatically switches control in the event of a primary unit failure. With robust processing power and extensive memory, it handles complex regulatory control, batch processing, and safety interlocks in industries such as chemical, pharmaceutical, and oil & gas. The system’s dual-redundant design ensures zero data loss during transitions, supported by advanced diagnostics and fiber-optic synchronization links. Built for longevity, it operates reliably in extreme conditions and is backed by Siemens’ global support network, making it an ideal choice for brownfield upgrades or greenfield installations requiring high availability.
| Parameter |
Specification |
| Model Number |
6ES7656-6CL33-7AF0 |
| Product Type |
SIMATIC PCS 7 CPU 410 Redundancy Automation System |
| Processor Type |
High-performance 32-bit RISC processor with floating-point unit |
| Memory (Program/Data) |
2 MB RAM (expandable via memory card) |
| Redundancy Architecture |
Hot-standby dual CPU with automatic failover (switchover time < 50 ms) |
| Communication Interfaces |
1x PROFIBUS DP (master/slave), 1x Industrial Ethernet (10/100 Mbps), 1x MPI/DP |
| Synchronization Link |
Fiber-optic (up to 10 km distance between CPUs) |
| Max I/O Modules Supported |
64 (distributed via PROFIBUS DP or ET 200 stations) |
| Power Supply Voltage |
24 V DC (nominal), range 20.4 to 28.8 V DC |
| Power Consumption |
Typical 12 W, max 18 W |
| Operating Temperature |
-25°C to +60°C (with derating above 50°C) |
| Storage Temperature |
-40°C to +85°C |
| Relative Humidity |
5% to 95% (non-condensing) |
| Protection Class |
IP20 (enclosure) |
| Safety Standard |
IEC 61508 SIL 2 (SIL 3 with external safety modules) |
| Certifications |
CE, UL, cUL, ATEX (Zone 2), FM (Class I, Div 2) |
| Diagnostics |
Integrated error logging, status LEDs, and remote diagnostics via PROFIBUS |
| Dimensions (W x H x D) |
40 x 125 x 130 mm (without connectors) |
| Weight |
Approx. 0.5 kg |
| Supported Software |
SIMATIC PCS 7 V8.0 or higher, STEP 7 V5.5 or higher |
| MTBF (Mean Time Between Failures) |
> 500,000 hours (calculated per Siemens standards) |
What Does Our Clients Say
Mitsubishi MR-J4
Laura Navas
Great product!
2019/12/01
Keyence sensor
EQDR SALES
Original and fast!
2020/02/22