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4.5 Communication with PLC
4.5.1 Automatic Communication Settings Function
After turning on the power supply, if there is no response from the PLC connected to the COM.
port, the GT switches to the automatic setting mode for the communication conditions. In the
automatic setting mode, commands are sent to the PLC while changing the communication
conditions in the sequence shown below.
The GT, in automatic setting mode, continues to repeat steps 1 to 4 until there is a response
from the PLC. While it is repeating these steps, it is in the "Standby" mode under
"Configuration" > "Communication Parameters" > "Handle Communication Error" on GTWIN.
Explanation of this function:
•
Conditions when the automatic settings mode is in effect
If communication is attempted the specified number of times and there is no
response from the PLC, the GT goes into the automatic settings mode. The
number of attempts is specified using the "No. of Retries" parameter under
"GT Configuration" > "Communication Parameters" > "Handle
Communication Error" on GTWIN.
•
Automatically set communication conditions
In the automatic settings mode, if there is a response from the PLC,
subsequent communication is carried out under conditions matching the
response.
The main unit configuration settings are not updated, however, even if the
communication parameters are different from those of the main unit
configuration settings.
•
An error response from the PLC is taken as a response, and the GT does
not go into the automatic settings mode.
4.5 Communication with PLC
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