The Cpu Modules - Mitsubishi MELSEC System Q Manual

The MELSEC System Q
3.4

The CPU Modules

The MELSEC System Q offers 19 different CPU modules and therefore state-of-the-art perfor-
mance. Up to four CPU modules can be mounted to one base unit und thus distribute control
and communication tasks. As with other Mitsubishi controllers the power of the MELSEC Sys-
tem Q grows with your application – you simply replace or add a CPU.
CPU modules can be divided in:
b PLC CPUs
Within the MELSEC System Q a PLC CPU performs the "classical" tasks of a PLC. This
CPU executes the PLC program, polls inputs, controls outputs and communicates with
special function modules.
b Process CPUs
The process CPU modules of the MELSEC System Q have the functionality of the PLC
CPUs and offer additional extended PID functions and integrated process functions with
52 special instructions. Thus this CPUs are suited to complex application e. g. in the chemi-
cal industry.
b Redundant Process CPUs
Offering all functions of process CPUs, redundant process CPUs of the MELSEC System
Q ensure maximum system availability for critical process and manufacturing automation
tasks.
A redundant setup consists of two identically-configured PLCs (power supply, CPU, net-
work modules etc.) which are conneted by a cable. One PLC controls the process while the
other is in "hot standby". If the active system fails the hot standby system cuts in automati-
cally and takes over, without any interruption. This significantly reduces down time and re-
start overheads and costs.
b PC CPU
The PC CPU module is a compact personal computer of high value which can be installed
on the main base unit. Here the Q-PC masters PC typical applications as well as PLC
applications. Therefore, it is suitable as an integrated PC within control systems - e.g. for vi-
sualization, data bases, and log-trace functions of the Microsoft application or for program-
ming the System Q in a high-level language. In addition, the system can be controlled as
soft PLC according to IEC1131 via the optional SX-Controller software.
For the connection to the peripherals I/O and special function modules from the MELSEC
System Q can be used.
b C-Controller CPU
The C-Controller allows the integration and programming of the automation platform Sys-
tem Q with C++. Using the worldwide established real time operating system VxWorks,
realisation of complex tasks, communication and protocols becomes easy.
b Motion CPUs
The motion controller CPU controls and synchronizes the connected servo amplifiers and
servo motors. A motion system besides the controller CPU as well includes a PLC CPU.
Only after combining a highly dynamic positioning control and a PLC an innovative and
autarkical motion control system is created.
While the Motion CPU controls large-scale servo movements the PLC CPU is responsible
for the machine control and the communication at the same time.
In this Beginners Manual only the PLC CPU are described in detail. For information about the
other CPU modules please refer to the Technical Catalogue MELSEC System Q, art. No.
136731 and the manuals for the individual modules.
MELSEC System Q Beginners Manual
The CPU Modules
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