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- Closed and EMC-shielded enclosure
- 21 slots
- Battery compartment for backup batteries (1 lithium battery type AA)
- Fan with fan monitoring
- Configurable operating hours counter (with D7-SYS V8.1 or higher)
- 4 status LEDs
- 3 floating fault signaling relays
- High-capacity 64-bit backplane bus for high-speed data exchange between the modules
- 8 slots with extended backplane bus (P0 connector) for high-speed point-to-point communication between CPU555 modules
- Insertion and removal aid for simple mounting and removal of modules
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