Chapter 1 Introduction; Considerations Before Selection Of Alternative Models For Replacement - Mitsubishi Electric MELSEC Q Series Handbook

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INTRODUCTION
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1.1 Considerations before Selection of Alternative Models for Replacement

This transition handbook describes the model selection of CPU modules and I/O modules after
replacing models, for the transition from the MELSEC-AnS/QnAS series to the Q series.
At the transition from MELSEC-AnS/QnAS series to Q series, some items such as the replacement
procedure, installation location, specifications comparisons between existing modules and replaced
modules, and replacement method are required to be considered beforehand.
The following shows major options. Consider them sufficiently in advance. (It is necessary to understand
the existing system configuration before making considerations.)
(Major items required to be considered in advance)
1) Replacement methods and installation location
a) Whether gradual replacement (only the CPU module is replaced with Q series, etc.) or batch
replacement for the replacement method of the existing system. When replacing it gradually,
which existing modules should be leveraged (left).
b) Whether some space can be reserved when adding a base unit at the replacement work.
2) Replacement schedule
3) Model selection after replacing models (I/O module)
a) Whether a module whose specifications (rated input current, etc.) and functions are equivalent
to that of the existing module exists or not in the Q series.
b) Whether utilizing the existing modules continuously or replacing them with Q series modules.
c) Whether utilizing the existing external wiring or wiring newly.
4) Model selection after replacing models (intelligent function module (analog, high-speed
counter module, etc))
a) Whether the specifications of replaced modules and connection external device match or not.
5) Model selection after replacing models (communication module (computer link module,
Ethernet module etc))
a) Whether the communication target device is compatible with the Q series module commands
in the communication using the MC protocol or not.
b) Whether the communication target device software (program) can be changed to Q series
CPU-compatible or not.
INTRODUCTION
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