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14 SYSTEM CONFIGURATION OF MULTIPLE PLC SYSTEM
14.2 Precautions For Multiple PLC System Configuration
14.2.1 Function versions of High Performance model QCPU, motion CPUs and PC CPU
module that can be used, and their mounting positions
14 - 4
(1) Function versions
(a) Allowable function versions and version confirmation method
1)
To configure a multiple PLC system, use the High Performance model
QCPU and Motion CPU of function version B.
2)
To use the PC CPU module, use the following High Performance
model QCPU and Motion CPU.
• High Performance model QCPU: First five digits of the serial No. is
• Motion CPU: The first digits of the serial No. must be as follows.
3) The function version of the High Performance model QCPU and Motion
CPU can be checked at the following places.
• Ratings nameplate of High Performance model QCPU and Motion
CPU
• Product data list of system monitor of GX Developer
(See Section 2.3 for details.)
(b)
Operations with different function versions
Function version A High Performance model QCPUs cannot be used on a
multiple PLC system.
Errors shown in table 14.1 will occur and the multiple PLC system will not
start up if function version A High Performance model QCPUs are used on
a multiple PLC system.
If any of the errors shown in table 14.1 are displayed after executing GX
Developer Version 6 or later PLC diagnosis function, replace the function
version A High Performance model QCPU with a function version B High
Performance model QCPU.
Table 14.1 List of operations with differing function versions
PLC No.1
PLC Nos. 2 to 4
Function version A
Function version A
Function version A
Function version B
Function version B
Function version A
Function version B
Function version B
1: The following errors may occur except "MULTI EXE. ERROR" when the PLC is
turned on or the High Performance model QCPU for PLC No.1 is reset.
• CONTROL-BUS ERR. (error code: 1413, 1414)
• MULTIPLE PLC DOWN (error code: 7000, 7002)
"03051" or later and function
version is B
Q172CPU ....... "H" or later
Q173CPU ....... "G" or later
Q172CPUN..... "A" or later
Q173CPUN..... "A" or later
Status of PLC No.1
UNIT VERIFY ERROR
(Error code: 2000)
UNIT VERIFY ERROR
(Error code: 2000)
MULTI EXE. ERROR
1
(Error code: 7010)
No error
MELSEC-Q
Status of PLC Nos. 2 to 4
SP. UNIT LAY ERROR
(Error code: 2125)
MULTI EXE. ERROR
1
(Error code: 7010)
SP. UNIT LAY ERROR
(Error code: 2125)
No error
14 - 4
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