Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6ES5255-3AC11 |
| Manufacturer | Siemens AG |
| Product Type | MONA-C / IP255 Display Module (Operator Interface) |
| Series | SIMATIC S5 |
| Compatible Systems | S5-100U, S5-95U, S5-135U, S5-155U |
| Display Type | LCD Alphanumeric (text/status display) |
| Display Capacity | Up to 4 lines × 80 characters (varies by version) |
| Keypad | 6 membrane keys with tactile feedback |
| Interface | S5 backplane bus (direct rack communication) |
| Power Supply | 24V DC via backplane (range 20.4–28.8V DC) |
| Power Consumption | Approx. 3–6 W (typical, with backlight) |
| Memory | Non-volatile EEPROM for parameter storage |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -25°C to +70°C |
| Protection Rating | IP20 (module body), IP54 (panel-mounted front) |
| Mounting | S5 rack slot installation (single slot width) |
| Approximate Weight | 0.3–0.6 kg |
| Certification | CE, UL (as per original production) |
| Status | Discontinued (End of Life) – Legacy spare parts only |
Main Features and Advantages
Direct Backplane Communication: A key advantage of the SIEMENS 6ES5255-3AC11 is its ability to communicate directly with the S5 CPU via the rack backplane bus . This “tight coupling” design eliminates the need for separate power supplies, communication cables, or IP address configuration, significantly reducing installation complexity and potential failure points . The SIEMENS 6ES5255-3AC11 achieves near-zero data transmission latency, ensuring that operators see process changes as they occur—a critical advantage in high-speed production environments where timely decisions can prevent defects and waste .
Versatile Operator Interface and Diagnostics: The SIEMENS 6ES5255-3AC11 provides operators with essential local control capabilities through its clear LCD display and tactile membrane keypad . It allows users to monitor process variables, scroll through parameters, edit setpoints, and acknowledge alarms directly at the machine . This reduces dependency on central control rooms or programming laptops. For maintenance engineers, the SIEMENS 6ES5255-3AC11 serves as an invaluable diagnostic tool, displaying fault codes and system status messages clearly, enabling rapid troubleshooting and minimizing downtime . The integrated non-volatile EEPROM memory ensures that configuration data and parameters are retained even during power cycles .
Broad Compatibility and Easy Integration: The SIEMENS 6ES5255-3AC11 is designed for versatile deployment across the entire SIMATIC S5 family, including S5-100U, S5-95U, S5-135U, and S5-155U systems . Occupying just a single slot, the SIEMENS 6ES5255-3AC11 is easily integrated into both densely populated and spacious control cabinets . Its design is optimized for rugged industrial environments, with a wide operating temperature range of 0°C to +60°C and protection ratings of IP20 for the module body and IP54 for the panel-mounted front, ensuring reliable operation in challenging conditions .
