Yokogawa Value Series FX1000 - Manual (Page 56)

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IM 04L21B01-17EN
Resuming Command Transmission
You can use the front panel keys to resume command transmission to a server device to
which communication is stopped (red status lamp).
1. Using the up and down arrow keys, select the command corresponding to the
server device to which transmission will be resumed. The message “Push [right
arrow] key to refresh” appears.
2. Press the right arrow key. The FX starts command transmission to the specified
server.
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 input data will be error data. On communication
channels, “+OVER” or –OVER is displayed according to the FX settings.
Data Dropout
Data drop occurs when the commands from 1 to 16 do not complete within the read
cycle (see appendix 1). When a data dropout occurs, the communication input data is
held at the previous value. A message indicating the data dropout is also displayed on
the Modbus operating 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.
1.10 Using Modbus to Read Data From and Write Data to Other Devices