Omron E5*D Series Connection Manual page 38

9.1.1. Outline of Processing
The following figure shows the data flow from when the Controller (SCU) sends CompoWay/F
command to the Destination Device until the Controller receives response data from the
Destination Device.
(1)The ST program executes the send command instruction (SendCmd instruction) for which
CompoWay/F is specified.
(2)The Controller sends command data of "Read Controller Attributes" to the Digital
Temperature Controller using communications via CompoWay/F.
(3)The Digital Temperature Controller executes the command by receiving the command data
from the Controller, and returns response data to the Controller.
(4)The Controller receives the response data from the Digital Temperature Controller and
stores in the specified variable.
CPU Unit
ST program
IF .... THEN
..........
ELSE
(1) Executes the send command
..........
End_IF
instruction.
(SendCmd instruction)
SendCmd(...
(Specifying CompoWay/F)
Local_cmddata
Command data
setting area
Local_recvdata
Response data
storage area
Controller
SCU
Serial Gateway
function
(4) Receives the response data
and stores it at the specified
variable in the memory.
Digital Temperature
RS-485
(2) Sends command data.
(Communications via
CompoWay/F)
Command data
Response data
9．Program
Controller
(3) Executes the
command
and returns
response data.
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