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Technical Specifications and Physical Structure
The Siemens 6ES5700-2LB11 mounting rack belongs to the SIMATIC S5 family and serves as the CR2 (Central Rack 2) model for the S5-155U PLC system . This rack provides 18 standard slots divided into two independent segments of 9 slots each . Each segment contains its own dedicated backplane bus structure. The rack’s dimensions measure approximately 483 mm x 290 mm x 210 mm and it weighs roughly 3.5 to 4.5 kg . A high-grade steel frame with镀金总线触点 ensures reliable signal transmission.
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model Number | 6ES5700-2LB11 |
| Product Family | SIMATIC S5 |
| Rack Type | CR2 (Central Rack 2) |
| Compatible PLC | S5-155U |
| Slot Count | 18 (2 segments, 9 slots each) |
| Bus Structure | Integrated K-Bus and C-Bus |
| Dimensions (WxHxD) | 483 x 290 x 210 mm |
| Weight | 3.5 to 4.5 kg |
| Material | Steel frame +阻燃工程塑料 |
| Protection Class | IP20 |
| Operating Temperature | 0°C to +60°C |
| Product Status | Obsolete |
Dual-Segment Architecture and Redundancy
The 6ES5700-2LB11 features a unique dual-segment architecture that supports hardware redundancy. Users can install two independent CPUs within the same rack, one in each segment. These CPUs communicate through dedicated synchronization modules for real-time data mirroring. Consequently, the system achieves hot standby redundancy with millisecond-level switchover capability during a primary CPU failure . This architecture proves invaluable for critical processes where downtime is not an option.
System Expansion and Application Scenarios
Beyond redundancy, this mounting rack also supports remote I/O expansion configurations. One segment can house the CPU while the other accommodates an interface module (IM) for connecting remote expansion racks . This topology enables the management of hundreds of I/O points across significant distances. The 6ES5700-2LB11 suits large-scale continuous processes such as power generation and chemical production . Its robust construction ensures reliable operation in demanding industrial environments.