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The 6ES5252-5BA11 functions as a synchronizing module for the Siemens SIMATIC S5 PLC system. This unit synchronizes multiple CPUs for redundant or multi-processing applications. It coordinates program execution and data exchange between parallel processors. Therefore, this module enables high-availability control systems for critical industrial processes.
Technical Specifications
We engineered this synchronizing module for fault-tolerant automation applications. Its single-slot design fits directly into a standard S5 rack. Moreover, the module includes hardware comparators for output verification between redundant CPUs.
| Parameter | Specification |
|---|---|
| Dimensions (H x W x D) | 8.9 x 1.5 x 5.1 inches (226 x 38 x 130 mm) |
| Weight | 0.42 kg (0.93 lbs) |
| Supported CPUs | 2 to 4 processors per system |
| Synchronization Method | Hardware clock pulse matching |
| Data Exchange Rate | 1.5 MB per second |
| Communication Interface | 25-pin D-sub connector |
| Cable Type | Dedicated fiber optic or twisted pair |
| Maximum Cable Length | 200 meters (656 feet) |
| Redundancy Modes | Hot standby, active-active |
| Fault Detection | Hardware comparator with voter logic |
| Internal Power Draw | 120 mA from 5V DC backplane |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
Synchronization Architecture
The 6ES5252-5BA11 maintains identical program execution across multiple CPUs. All processors receive the same input data simultaneously from the module. Each CPU executes the user program in perfect step with its peers. Consequently, all redundant processors stay exactly synchronized for bumpless switchover.
Data Exchange and Coordination
This synchronizing module transfers data between CPUs at 1.5 MB per second. It shares memory contents, timer values, and flag status across all processors. The module also synchronizes internal clocks to prevent drift over time. Therefore, every CPU sees exactly the same view of the process at all times.
Output Comparison and Voter Logic
The 6ES5252-5BA11 continuously compares the outputs from each CPU. A hardware voter determines the majority value when discrepancies occur. The module disables any processor that produces differing results consistently. Hence, a faulty CPU cannot cause incorrect outputs to the field devices.
Redundancy Operation Modes
This synchronizing module supports two primary redundancy configurations. Hot standby mode keeps one CPU active while another runs in shadow mode. Active-active mode uses all CPUs simultaneously with output voting. You can select the appropriate mode based on your fault tolerance requirements.
Cable Options and Distance
The 6ES5252-5BA11 connects to other modules using fiber optic or copper cables. Fiber optic cabling allows distances up to 200 meters between racks. Twisted pair cabling works for shorter distances up to 50 meters. Use shielded cables for copper connections to prevent electrical interference.
Energy Storage and Data Retention
This synchronizing module contains no battery for data retention purposes. It draws 120 mA from the 5V DC backplane during normal operation. The module holds no user data or program memory onboard. All synchronization parameters reset during power loss and reload from the CPUs.
Installation and Configuration
Mount the 6ES5252-5BA11 into any SIMATIC S5 rack slot securely. Connect the synchronization cables to the 25-pin D-sub connectors. Configure the module as master or slave using the onboard DIP switches. Assign each CPU a unique identifier for proper bus arbitration. Always terminate both ends of the synchronization bus with proper resistors. Verify all CPUs use identical program versions before synchronizing.