Chapter 6 Applied Instruction
6-425
the timeout period set. It is suggested that the timeout period set should be longer
than the time set in D
2
+1.
Mode of receiving data: 2, 3, 5, or 6
Description:
① Users start/stop the execution of the instruction.
② Time in which data is sent
The period of time in which data is sent is not measured.
③ After the first character is received, the time which passes before the next character
is received will be measured. Whenever a character is received, the time measured
is cleared. A communication timeout flag will not be set to ON until the time
measured exceeds the timeout period set.
④ If the instruction is still enabled after users reset a completion flag or a
communication flag, the next communication data is sent automatically when the
instruction is scanned in the next cycle.
12. Mode of sending data/Mode of receiving data
8-bit mode: The command which is edited is stored in the initial transmission device, and the
command which will be sent include the head code and the tail code. The 16-bit data is divided
into the high 8-bit data and the low 8-bit data. The high 8-bit data is ignored, and the low 8-bit
data can be sent or received. (Take standard Modbus for example.)
Sending the data: (PLC→External equipment)
Receiving the data: (External equipment→PLC)
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