Chapter 6 Applied Instructions Starting the execution of the instructi on Sending d ata Reception fl ag Receiving d ata Completion fl ag Comm uni cation timeout fl ag 2 3 5 2 1 4 4 1 Description: ① Start/stop the execution of the instruction. ② Time during 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 that passes before the next character is received is measured. Whenever a character is received, the instruction clears the time measured. The completion flag is not be set to ON until the time measured is greater than the setting value in D 2 +1.
6_ ④ If the instruction is still enabled after you reset the completion flag or the communication flag, the next communication data is sent automatically when the instruction is scanned in the next cycle. ⑤ When the PLC begins to receive data, it begins to measure the time that passes. It does not set the communication timeout to ON until the time measured exceeds the timeout period. It is suggested that you set the timeout period to be longer than the time set in D 2 +1. 6-551