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5.2.8 GT Configuration Settings: “Hold Device Value”
Clicking on the “Hold PLC Device” tab in the “GT Configuration” dialog box displays the screen shown
below. “Hold PLC Device” is a function that enables internal PLC device values to be held on the GT
main unit side. “Hold GT Device” is a function that holds the values for an internal device (GDT or GWR)
in the GT main unit.
“Hold Device value” screen
Hold PLC Device
The Hold PLC Device function reads the values for the specified internal PLC device to the SRAM in the
GT main unit, and tacks up the values.
• Off:
• On:
PLC devices are not held.
PLC devices are held. (up to 24 words)
If “On” is selected for the above Hold PLC Device setting, “Device” and “Number of Word” parameters
are displayed. Clicking on the
button displays a dialog box like that shown below, where the type of
initial device, the address, and the number of words can be specified.
Device Setting dialog box
Click on the button to display the pull-down menu, and select
the device from that menu. Enter the address using the ten-
keys.
The
button functions as a backspace key when entering
addresses. The
button acts as a Clear key.
Note:
• Data for PLC devices held in the GT main unit will be written to the internal PLC device the next time
that the power supply is turned on.
• The data held for the internal PLC device is backed up by means of a lithium battery. The service life
of the battery is approximately two years.
Reference: <Chapter 7 Servicing and Maintenance>
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