Mitsubishi QJ71C24N User Manual page 32

1 OVERVIEW
Inverter station No. is set
in device (D0).
Operating mode value
is stored in device (D100).
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(d) By specifying transmission and reception data storage areas, device or
buffer memory data can be set in communication packets.
• For sending
The user can set a variable system-dependent element, such as a
channel number, in the specified device or buffer memory.
The QJ71C24N(-R2/R4) automatically places the value in the user-
specified device or buffer memory into the appropriate position of the send
packet before sending the packet.
• For receiving
The QJ71C24N(-R2/R4) automatically stores only the necessary data,
such as readout values, in the user-specified device or buffer memory.
The following is an example.
• System example
The QJ71C24N(-R2/R4) is connected to an inverter and reads the
operating mode value from the inverter.
A packet with the inverter station No. set in device (D0) is sent, and an
operating mode value is stored in device (D100).
QJ71C24N
CPU
CH1. CH2.
Device
Header
CH1.
D0 Inverter
station No.
RS-232
Header
D100
Operating
mode value
CH.2
SDA
1
SG
2
SDB
(FG)
3
RDA
4
(FG)
5
RDB
6
RS-422
7
/485
(e) With the debugging support function of GX Configurator-SC (Pre-defined
protocol support function), programs for communications between the
QJ71C24N(-R2/R4) and external device can be debugged.
• In the Protocol execution log window, the protocol name, start and end
dates and times, and result of each execution can be monitored.
• The circuit trace function allows tracing of send/receive packet data and
the signal line status.
• By the State monitor, the error status and signal lines of the QJ71C24N(-
R2/R4) can be monitored.
D0
Inverter
Check code
station No.
D100
Operating
Check code
mode value
MELSEC-Q
FREQROL-A700
Terminator
Terminator
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