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MELSEC-Q
14 SYSTEM CONFIGURATION OF MULTIPLE PLC SYSTEM
14.2.2 Precautions when using Q Series I/O modules and intelligent function modules
(1) Compatible I/O modules
All I/O modules (QX , QY ) are compatible with to multiple PLC system. They
can be used by setting any of PLC No.1 to No.4 as a control PLC.
(2) Compatible intelligent function modules
(a) The intelligent function modules compatible with the multiple PLC system
are those of function version B or later. They can be used by setting any of
PLC No.1 to No.4 as a control PLC.
(b) Q Series high speed count modules (QD62, QD62D, QD62E) are
compatible with by multiple PLC system are those of function version A or
later. They can be used by setting any of PLC No.1 to No.4 as a control
PLC.
(c) Q Series interruption modules (QI60) do not have a function version, but are
supported by multiple PLC systems. PLCs No.1 to No.4 can be set up as
control PLCs.
(d) Intelligent function modules of function version A can be used in multiple
PLC system by setting PLC No.1 as a control PLC.
However, only control PLC can be accessed from serial communication
modules and other external modules. (MELSECNET/H, serial
communication modules and other external modules cannot access non-
control PLCs.)
The "SP. UNIT VER. ERR (error code: 2150)" occurs if any of PLC No.2 to
No.4 has been set as a control PLC, and the multiple PLC system will not
be a started up.
(3) Ranges of access to control and non-control modules
In a multiple PLC system, non-control modules can be accessed by setting "I/O
setting outside of the group" at the "Multiple PLC settings" dialog box in "PLC
Parameter". The following table indicates accessibility to the control and non-
control modules in the multiple PLC system.
Accessibility
Non-control module (I/O setting outside of the group)
Access target
Control module
Disabled
Enabled
Input (X)
Read
Output (Y)
Write
Read
Buffer
memory
Write
: Accessible
: Inaccessible
REMARK
• The function version of intelligent function modules can be confirmed at the rated
name plate of the intelligent function module and with the GX Developer's "System
monitor product information list window" (see Section 2.3.)
• See Section 14.2.4 for details on restrictions on the number that can be used with
intelligent function modules.
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