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MELSEC-Q
1 OVERVIEW
1.3 About Added/Changed Functions in Function Version B
The table below lists the functions that have been added or changed in the Q series
C24 of function version B.
See Section 2.6 for the function version, serial NO. and software version of products
(CPU module, GX Developer, GX Configurator-SC) related to the Q series C24 which
can use added/changed functions.
See Appendix 1.1 concerning a comparison of functions in the different Q series C24
function versions.
Function
QJ71C24N
(-R2/R4)
QJ71C24
(-R2)
Outline of function Reference section
Simultaneous connection of
GX Developer and GOT
This function allows access to the PLC from a PC with GX Developer and a
GOT connected to two different interfaces of the Q series C24 at the same
time.
Section 1.2 of
User’s Manual
(Basic)
Control of RS and DTR
signal states
This function allows the control of the on or off state of the RS and DTR
signals with the PLC program.
Remark of section
3.2.1
Support for 230,400 bps
This function allows data communication with an external device at a
transmission speed of 230,400 bps.
Data transmission/reception
at low speed
This function allows data communication with an external device at a
transmission speed of 50 bps.
Chapter 4 of
User’s Manual
(Basic)
Clearing reception data by a
dedicated instruction
This function allows clearing reception data using the CSET instruction
during data communication using the non procedure protocol.
It is possible to clear the data even when data is being transmitted.
Chapter 6, Section
9.8 of User’s
Manual (Basic)
Transmission of the PLC
CPU monitoring information
through combined use of the
modem function
When the PLC CPU monitoring function is active, this function sends the
monitoring information of the PLC CPU to the external device through the
modem.
Chapter 2 of
User’s Manual
(Application)
Remote password check
This function allows data communication after the external device
completes the unlock processing of the remote password set at a QCPU. It
is executed when the QCPU is accessed from a remote location using the
modem function of the Q series C24 in the following forms of data
communication:
• Communication using the MC protocol
• Communication using GX Developer
Chapter 3 of
User’s Manual
(Application)
Section 3.18 of
Reference Manual
Automatic initialization for
modem
Initializes the modem automatically when Q Series C24 starts up.
Callback
After line connection from the GX Developer, access to the QCPU from the
GX Developer is made possible through line reconnection from the Q Series
C24 (callback). Transmission costs after line connection from the Q Series
C24 side are borne by the Q Series C24 side.
Chapter 3 of the
User’s Manual
(Application)
Addition of non reception
monitoring time format in
non procedure protocol
This function allows messages to be received in the non reception protocol
by time-out in non reception monitoring time (timer 0) if the received
complete code and received data count have been not determined.
Chapter 6 of
User’s Manual
(Application)
Transmission control
start/end free area
designation
This function allows the designation of the available capacity of the OS area
that notifies the data reception failure at the time of transmission control
(DTR/DSR signal control and DC code control).
Chapter 7 of
User’s Manual
(Application)
Addition of changeable data
to the user frame
(05
H
, 0B
H
, 11
H
, 17
H
)
Addition of changeable data
to the user frame
(04
H
, 0A
H,
E5
H,
EB
H
)
These functions allow the following codes to be registered as the
changeable data of user frames for data communication.
• Horizontal parity code
• Sum check code of two’s-complement number
Chapter 9 of
User’s Manual
(Application)
Adding a reception function
through the use of user
frames
This function allows reception of a message consisting of the head frame
and any data field when receiving data by specifying the head frame.
The data length of the data field can be specified freely for each
combination of user frames for reception set by the user.
(Receiving 1 byte providing ACK/NAK only is also possible by setting the
data length of the data field to “0.”)
Chapter 11 of
User’s Manual
(Application)