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7-10
H Timing Chart
01000
(Program Start Input Bit)
01001
(Start Switch ON)
00000
(Message Execution Flag)
03000
(Sending Message Flag)
03001
(Message Sent Flag)
IOWR instruction execution
00001 IOWR Write
Completed Flag
00002 Response Flag
Message Communications
Enabled Flag
Completion code error
DM 0100
(Completion code storage)
1. 2. 3.
H Operation
1. When the Program Start Input Bit is turned ON, the Message Execution Flag will turn ON, and the
command specified in the DM Area will be sent using the IOWR instruction.
2. When the Message Communications Enabled Flag is turned ON, the completion code (DM 2001) is
examined. If an error is found, the completion code is stored in DM 0100, and the command is re-
executed.
3. If the completion code of the response is normal, the Message Sent Flag will be turned ON, and the
Sending Message Flag will be turned OFF.
Communications Programs (SYSMAC C200HX/HG/HE PCs) Chapter 7