Delta AH500 series Manual Page 30

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Chapter 2 Programming
2.7
Creating Global Symbols
In order to make the program more readable and the connection with the SCADA system more
convenient, the I/O addresses are accompanied with the global symbols. Users can use the
symbols when they write the program. The global symbol table also supports import and export. As
to the system equipped with many inputs and outputs, users can use Microsoft Excel to make the
editing more convenient.
The global symbols created are as follows.
Global symbol table
Bit (for the I/O on the PLC)
Address Identifier Data type
X0.0 Tank_B1F_LSW BOOL
X0.2 Tank_RF_LSW BOOL
X0.3 Tank_RF_HSW BOOL
X0.5 SPP01_Remote BOOL
X0.6 SPP01_Run BOOL
X0.7 SPP01_Trip BOOL
Y0.0 SPP01_Start BOOL
D0 Tank_B1F_LT REAL
Bit (for the SCADA system)
M0 SPP01_Auto BOOL
M1 SPP01_Man_SW BOOL
With the information above, users can create the global symbols. Double-click in the
window at the left side of the main screen of the software to open the
Global Symbols
window.
Double-click the blank to open the
Add Symbol
window. Type “X0.0” in the
Address
box. The
default values in the
Type
box, the
Initial
box, and the
Comment…
box remain unchanged. Click
OK
to complete the typing.
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