Data transfer within the PLC
859
Part III FP Instructions
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
w
dw
i
di
BOOL
WORD
DWORD
INT
DINT
You can insert these system variables into the body via the "Variables" dialog.
Tip:
Set the class filter to <System Variables> to display system variables only.
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 Next Page
Loading...
