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Versatile Expansion for M7-400 Systems
The Siemens 6ES7478-2AC00-0AC0 serves as an EXM478 expansion module for the SIMATIC M7-400 and S7-400 programmable controller series . This module provides additional interface capabilities for the CPU, supporting up to three interface submodules . It is specifically designed for mounting on a CPU 486-3, CPU 488-3, or FM 456-4 application module . The expansion module supports both AT-compatible I/O addressing and M7-400-specific I/O addressing for flexible configuration .
Technical Specifications
| Specification | Value |
|---|---|
| Model | 6ES7478-2AC00-0AC0 |
| Sub-Model | EXM478 |
| Product Type | Expansion Module |
| System Compatibility | SIMATIC M7-400 / S7-400 |
| Expansion Capacity | Up to 3 interface submodules |
| Supported Host Modules | CPU 486-3, CPU 488-3, FM 456-4 |
| Power Supply | 24 V DC |
| Current Consumption | 50 mA (from backplane) |
| Weight | Approx. 0.5 kg |
| Operating Temperature | -25 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Protection Class | IP20 |
Installation and Configuration
Assembling the Siemens 6ES7478-2AC00-0AC0 with its host module requires a specific sequence: remove connector covers, attach connecting clips, and plug modules together on a flat surface . The module supports expansion with up to three modules in total after the CPU, with specific rules governing the order of EXM 478, MSM 478, and ATM 478 modules . The BIOS automatically configures some interface submodules, including the IF 962-VGA and up to three LPT ports . This modular approach provides substantial flexibility for customizing M7-400 systems to meet specific application requirements.