• For mounting and connection of the CPUs and communication modules, not needed for PM595
• 1 to 4 plug-in communication modules
• Connection for communication coupler integrated in the CPU
• I/O interface for direct connection of up to 10 expansion modules
• Fieldbus-neutral FieldBusPlug-Slave interface not for TB523-2ETH
• Connection COM1: 9-pole pluggable terminal block
• Connection COM2: D-Sub 9 (not for TB523-2ETH).
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