Yokogawa Touch Screen GP20 - Manual (Page 233)

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IM 04L51B01-01EN
Operating the GX/GP
1
2
3
4
5
App
Communication Condition
The following settings are displayed. The setting display varies between Modbus client and
Modbus master.
Function Setup Item Display
Modbus client Wait time Auto recovery
Modbus master Interval Read cycle
Communication timeout Time out
Retransmission Retrials
Wait time Auto recovery
Communication Status
See page 2-41 in section 2.3.5, “Displaying Logs”.
Resuming Command Transmission
You can use touch operation to resume command transmission to a server to which
communication is stopped (red status lamp).
1
Select the command to send to the server.
The Modbus information appears.
2
Tap Refresh.
The GX/GP starts command transmission to the specified server.
Operation complete
Data When Communication Is Stopped and during Connection Retrials
If the command transmission stops such as due to a connection drop, the status turns
orange or red, and the communication channel data is held at the previous value or is reset.
Data Dropout
Data drop occurs when the commands from 1 to 100 from the GX20/GP20 or from 1 to 50
from the GX10/GP10 do not complete within the read cycle. When a data dropout occurs,
the communication channel data is held at the previous value.
In addition, command execution times are displayed in red on the Modbus operating status
display, and a command dropout icon appears.
Tap the icon to clear it. If another data dropout occurs, the icon will reappear.
A message indicating the data dropout is also displayed on the Modbus operation status
display. If this happens, take measures such as making the read cycle longer or reducing
the number of commands. Confirm that no data dropout occurs on the Modbus status log
screen.
2.3 Displaying Various Types of Information