ST editor in online mode

In online mode, TwinCAT displays the variables and expressions used in the ST editor. Writing and forcing of variables as well as expressions and debugging functions (breakpoints, single-step processing) are also possible.

If you use assignments as expressions in ST programming, no further breakpoint positions occur within a line.

See also:

• Monitoring in Programming Objects
• Use of breakpoints
• Using Watchlists
• Forcing and Writing Variables Values
• Testing a PLC project and troubleshooting
• Stepwise processing of the program (stepping)
• Flow Control
• Determining the Current Processing Position with the Call Stack