3.5 Input and Output Signal Process for Field Network
144
(2) Command Sending and Receiving Timing (Reading and Writing of Position Data and Reading of
Alarm Axis)
By writing and reading the specified commands to the area of 5-word next to Gateway
control/status area, reading and writing of the position data and reading of alarm axis can be
conducted.
Gateway executes the demand command ever time the control/status data exchange finishes
for all the axes. [Refer to Section 3.4.11 About Command.]
● Step
1) PLC confirms the area of response command is 0.
2) PLC sets the necessary demand commands and data to the indicated area and send them.
3) Gateway detects that the area of the demand command has become other than 0, and
rewrites the appropriate axis data if it is the writing command, and reads the requirement
data from the appropriate axis if reading command.
4) Gateway output the response result to PLC once the command is executed.
5) Once PLC has confirmed the response result, clear the area for the demand command to 0.
6) Gateway clears the response command area to 0 and waits for the next command after it
detects the demand command is cleared.
The procedures from 1) to 6) are repeated when continuously used.
Demand Command
and Data
1)
2)
3)
Response Command
and Response Data
4)
5)
PLC side
MSCON
Gateway side
Response Command Area = 0000H
Gateway executes the reading
of each axis and data following
the demand command.
Demand Command Area = 0000H
6)
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