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24.1 Data transfer to and from special data registers
FPWIN Pro offers three possibilities to read from or write to special relays/special data registers.
1. Via system variables (recommended from version 5.1 onwards)
For each special data register and relay a system variable exists according to the following syntax:
sys_
*
_system variable
b
BOOL
w
WORD
dw
DWORD
i
INT
di
DINT
You can insert these system variables into the body via the "Variables" dialog.
Tip: Set the class filter
In addition these system variables are also displayed under Monitor Special Relays and
Registers as the last entries in the comments, e.g. "sys_w_HSC_ControlFlags".
Example for accessing the special data for HSC
Example for accessing the special data for the RTC
2. via global variables
3. via direct addresses in the body
to <System Variables> to display system variables only.
Data transfer within the PLC
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