Panasonic AFP7CPS4E User Manual page 92

MODBUS RTU
Master/Slave Communication
 Timing chart
Master communication
Clear to send flag
(XC, XD, XE, XF)
Master communication
Sending active flag
(YC, YD, YE, YF)
Execute SEND
Master communication
Sending done result flag
(Y0, Y1, Y2, Y3)
Sending data
Response reception
processing
 I/O allocation (For CPU Unit)
COM port no.
1 2 0
XC XD XE
YC YD YE
Y0 Y1 Y2
 I/O allocation (For Serial Communication Unit)
COM port no.
1 2 3 4
XC XD XE XF
YC YD YE YF
Y0 Y1 Y2 Y3
(Note 1) Each contact is used for reading the operation status. Do not write over it with a user program.
8-10
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Confirm ON
Confirm OFF
Name
Master Turns ON when MEWTOCOL-COM, MEWTOCOL7, or
communication Clear MODBUS-RTU is set for the communication mode, and the unit
to send flag is in the RUN mode.
Master Turns ON during sending data based on SEND/RECV
communication instruction.
Sending active flag Turns OFF when the sending process is completed.
Reports completion result of sending data in general-purpose
Sending done result
communication or master communication. (Normal completion:
flag
0, Abnormal completion: 1)
Name
Master Turns ON when MEWTOCOL-COM, MEWTOCOL7, or
communication MODBUS-RTU is set for the communication mode, and the unit
Clear to send flag is in the RUN mode.
Master
Turns ON during sending data based on SEND/RECV
communication
instruction.
Sending active
Turns OFF when the sending process is completed.
flag
Reports completion result of sending data in genera-purpose
Sending done
communication or master communication.
result flag
(Normal completion: 0, Abnormal completion: 1)
Conditions to enable execution of SEND
instruction
Clear to send flag (XC, XD, XE, XF): ON
Sending active flag (YC, YD, YE, YF): OFF
Sending active flag (YC, YD, YE, YF):
Sending data: ON, Sending done: OFF
Sending done result flag (Y0, Y1, Y2, Y3):
Normal completion: OFF
Abnormal completion: ON
Explanation
Explanation