Mitsubishi Electric MELSEC-Q Series User Manual page 23

1 OVERVIEW
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(6) Connection of up to four/two extension base units
(a) The Q00JCPU can connect up to two extension base units (three base units
including the main) and accepts up to 16 modules.
(b) The Q00/Q01CPU can connect up to four extension base units (five base
units including the main) and accepts up to 24 modules.
(c) The overall distance of the extension cables is up to 13.2m to ensure high
degree of extension base unit arrangement.
POINT
When bus-connecting the GOT, the number of extension base units connected
decreases by one since the GOT uses one stage of the above base units.
(7) Serial communication function for communication with personal
computer or display device
With the RS-232 interface of the Q00CPU or Q01CPU connected with a personal
computer, display device or the like, the MELSEC communication protocol
(hereafter refered to as the MC protocol) can be used to make communication.
RS-232 cable
Personal computer,
display device
The serial communication function only allows communication in the MC protocol
(QnA-compatible 3C frame (format 4), QnA-compatible 4C frame (format 4, 5)).
The serial communication function does not allow communication in the
nonprocedure protocol or bidirectional protocol.
Refer to the following manual for the MC protocol.
• Q Corresponding MELSEC Communication Protocol Reference Manual
(8) Built-in standard ROM
The flash ROM for storing parameters and sequential program is installed as a
standard feature for easier protection of important program.
(9) Easy operation of CC-Link system
The I/O signals for up to 32 remote I/O stations can be controlled without
parameters when one master module of the CC-Link system is used.
The remote I/O stations can be controlled in a similar manner to controlling the
input/output modules installed on the base unit.
(10) Blocking an invalid access using the file password
Program can be prevented from being altered through invalid access by
presetting the access level (reading prohibited, writing prohibited) in the file
password.
Communication in
MC protocol
MELSEC-Q
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