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MELSEC-Q
13 OUTLINE OF MULTIPLE PLC SYSTEMS
(6) Interactive transmission with non-control PLCs (see Chapter 17)
(a) It is possible to control I/O modules and intelligent function modules
controlled by the host PLC in the same way as on an single CPU system.
(b) It is not possible to output ON.OFF data to modules that are not controlled
by the host PLC or write in the buffer memory of intelligent function
modules.
It is possible to read I/O data from non-control modules with PLC parameter
settings.
It is possible to confirm the status of modules controlled by other PLCs, the
control status of other PLCs, and control the host PLC.
(7) Interactive transmission between each CPU modules on a multiple
PLC system (see Chapter 16)
It is possible to perform the following interactive transmission between each CPU
modules with a multiple PLC system.
• Automatically refreshing the device data between each CPU modules with
multiple PLC system parameter settings.
• Data transfer between other High Performance model QCPU and PC CPU
module via CPU shared memory using multiple PLC instructions (FROM, S.TO
instructions)
• Reading CPU shared memory of Motion CPU from High Performance model
QCPU with multiple PLC instructions (FROM instruction).
• Control instruction from the High Performance model QCPU to the motion CPU
with Motion dedicated PLC instructions.
• Writing and reading of the device data from the High Performance model
QCPU to the Motion CPU/PC CPU module with communication dedicated
instructions between multiple PLCs.
• Event issuance from High Performance model QCPU to PC CPU module using
instructions dedicated to multiple PLC communication
(8) Processing during resets and errors (see Sections 14.2.7 and
14.2.8)
The processing performed when resets and errors occur are different for the
multiple PLC system's PLC No.1 and the PLC No.2 to PLC No.4.
(a) High Performance model QCPU for PLC No.1 can be reset with a multiple
PLC system.
CPU modules for PLC No.2 to No.4 and Motion CPU cannot be reset.
(b) Multiple PLC system operations will be suspended when a stop error occurs
with the PLC No.1.
It is possible to select whether to suspend or continue with multiple PLC
system operations when a stop error occurs with PLC Nos. 2 to 4 and
Motion CPU.
(9) Clock function
An intelligent function module with which the error code and time of occurrence is
stored in the buffer memory when an error is triggered is available (time data
read from the High Performance model QCPU.)
The PLC No.1 time data will be stored as the time that the error occurred
regardless of whether the module concerned is a control PLC or a non-control
PLC.
Содержание QCPU (Q Mode)
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