8.4 MODBUS RTU Master Communication (SEND)
8-11
KEY POINTS
Specify the port targeted for communication, using UNITSEL instruction
immediately before SEND/RECV instruction.
Master communication is only valid when MEWTOCOL or MODBUS is
selected. Confirm that the "Master communication Clear to send flag" (XC -
XF) for the targeted channel is ON, and execute SEND/RECV instruction.
You cannot execute other SEND/RECV instruction for a communication port
in master communication. Confirm that the "Master communication Sending
active flag" (YC - YF) is OFF, and execute instruction.
If no response is received, the "Master communication Sending active flag"
(YC - YF) remains ON throughout the timeout setting time specified in CPU
configuration.
You cannot execute SEND/RECV instruction for a port in slave
communication.
Up to 16 SEND/RECV instructions can be executed simultaneously for
different COM. ports.
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Страница 10: ...Table of Contents viii Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 21: ...2 Names and Functions of Parts Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 24: ...Names and Functions of Parts 2 4 Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 25: ...3 Wiring the COM Port Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 45: ...3 I O Allocation Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 52: ...I O Allocation 4 8 Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 57: ...6 PLC Link Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 97: ...9 General Purpose Communication Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 114: ...General Purpose Communication 9 18 Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 115: ...4 Troubleshooting Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 124: ...Troubleshooting 10 10 Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 125: ...11 Specifications Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...