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CHAPTER 3 SYSTEM CONFIGURATION
3
3.1 System Using Basic Model QCPU as CPU No.1
3.1.1 Available CPU modules, base units, power supply modules, and extension cables
(b) Precautions
• If I/O modules are mounted exceeding the maximum number, "SP.UNIT LAY ERR" (error code: 2124)
occurs.
• "Number of CPU modules" indicates the number set in "No. of PLC" of PLC parameter ("Multiple CPU
Setting").
• When a C Controller module which occupies three slots is used, the maximum number of mountable I/O
modules will be two smaller than the number defined in the table on Page 32, Section 3.1.1 (1) (a).
• A PC CPU module occupies two slots. When this module is used, the maximum number of mountable I/O
modules will be one smaller than the number defined in the table on Page 32, Section 3.1.1 (1) (a).