5-13
5 Installation
CJ2 CPU Unit Hardware User’s Manual
5-2 Installation
5
5-2-4 Connecting PLC Components
Precautions for Correct UsePrecautions for Correct Use
• Always turn OFF the power supply before connecting Units to each other.
• Always turn OFF the power supply to the entire system before replacing a Unit.
• A maximum of nine Configuration Units can be connected to a CPU Rack, and a maximum of
ten Configuration Units can be connected to an Expansion Rack. If more than the maximum
number of Units are connected, a too many I/O points error (fatal error) will occur and the CJ2
CPU Unit will not operate in either RUN or MONITOR mode. If this occurs, The I/O Overflow
Flag (A401.11) will turn ON and A407.13 to A407.15 (I/O Overflow Details 2) will turn ON.
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