Mitsubishi Electric MELSEC Q Series User Manual page 83

Table2.10 Restrictions on system configuration, available base units, extension cables, and power supply modules
CPU number CPU module1: CPU No.1, CPU module 2: CPU No.2, CPU module 3: CPU No.3, CPU module 4: CPU No.4
Maximum number of
extension stages
Maximum number of
mounted I/O modules
Available main base
unit model
Type not requiring power supply module
Available extension
Type requiring redundant power supply
base unit model
module
Available extension
cable model
Available power
supply module model
Precautions
• Do not use an extension cable longer than 13.2m (43.31 ft).
• When using an extension cable, keep it away from the main circuit (high voltage and large current) line.
• Set the number of extension stages so as not to be duplicated.
• Although there is no restriction on the connection order of the Q5 B and the Q6R B, check the availability
of them by referring to QCPU User's Manual (Hardware Design, Maintenance and Inspection).
• The Q6 B, QA1S6 B, QA6 B, or QA6ADP+A5 B/A6 B cannot be connected as an extension base
unit.
• Connect the OUT connector of an extension base unit and the IN connector of the adjacent extension base
unit by an extension cable.
• When 66 modules or more are mounted, an error "SP. UNIT LAY ERR." (error code: 2124) occurs. (The
number of mountable modules includes one CPU module.)
• "No. of CPUs" is the number of CPUs set by [No. of PLC] of GX Developer.
• When the redundant power main base unit is used, bus connection is not available for the GOT.
• When the redundant power main base unit is used, the Motion CPU, and PC CPU module cannot be used.
2 - 35
7 extension stages
65 - (No. of CPUs)
Q38RB
Q52B, Q55B
Q68RB
QC05B, QC06B, QC12B, QC30B, QC50B, QC100B
Q63RP, Q64RP