Mitsubishi Electric MELSEC Q Series User Manual page 71

Table2.7 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
mountable I/O
modules
Available main base
unit model
Type not requiring power supply module
Available extension
Type requiring Q series 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 Q6 B, check the availability of
them by referring to QCPU User's Manual (Hardware Design, Maintenance and Inspection) when both the
Q5 B and the Q6 B exist as the extension base unit.
• The QA1S6 B, QA6 B, QA6ADP+A5 B/A6 B, or Q6R 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 mounting the Universal model QCPU and the PC CPU module at the same time, use the PPC-
CPU852 (MS)-512 as the PC CPU module.
• The PC CPU module and C Controller module cannot be mounted together: therefore; mount either of them.
• The PC CPU module occupies two slots. Therefore, when the PC CPU module is used, the maximum
number of I/O modules is decreased by 1 from the value indicated in the table.
• For details of the PC CPU module and C Controller module, refer to the manuals of each CPU module.
2 - 23
7 extension stages
65 - (No. of CPUs)
Q38DB, Q312DB
Q52B, Q55B
Q63B, Q65B, Q68B, Q612B
QC05B, QC06B, QC12B, QC30B, QC50B, QC100B
Q61P-A1, Q61P-A2, Q61P, Q61P-D, Q62P, Q63P, Q64P, Q64PN