Panasonic FP7 Series User Manual page 123

■
Time chart (in the case of SCU)
Master communication
clear to send flag
(XC, XD, XE, XF)
Master communication
sending flag
(YC, YD, YE, YF)
Execute SEND
Master communication
sent flag
(Y0, Y1, Y2, Y3)
Sending data
Response reception
processing
● The case of SCU shows the case that it is used in the following combination.
• COM.0 port equipped in the CPU unit
• Communication cassettes attached to the CPU unit (COM.1 to COM.2 ports)
• Communication cassettes attached to the serial communication unit (COM.1 to COM.4
ports)
● As the communication cassette (Ethernet type) has an Ethernet-serial conversion function, the
internal interface operates with similar programs as the case of the CPU with built-in SCU. The
setting method and programming method are different from those for the CPU with built-in ET-
LAN. The communication cassette (Ethernet type) does not support MODBUS.
■
I/O allocation (in the case of CPU with built-in SCU)
COM Port No.
1 2 0
XC XD XE
YC YD YE
Y0 Y1 Y2
(Note 1) Each contact is used for reading the operation state. Do not write over it with a user program.
WUME-FP7COM-07
8.4 MODBUS RTU Master Communication (SEND)
Check that the
flag is ON
Check that the
flag is OFF
Name
Master Turns ON when MEWTOCOL-COM, MEWTOCOL7, or MODBUS-
communication RTU is set for the communication mode, and the unit is in the
clear to send flag RUN mode.
Master
Turns ON during sending data based on SEND/RECV instruction.
communication
Turns OFF when the sending process is completed.
sending flag
Reports completion result of sending data in genera-purpose
communication or master communication.
Sent flag
(Normal completion: 0, Abnormal completion: 1)
SEND instruction executable conditions
Clear to send flag (XC, XD, XE, XF):
ON
Sending flag (YC, YD, YE, YF): OFF
Sending flag (YC, YD, YE, YF):
While sending: ON; Sending done:
OFF
Sent flag (Y0, Y1, Y2, Y3):
Normal completion: OFF
Abnormal completion: ON
Description
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