示例: PROGRAM PLC_PRG VAR
. 错误示例: PROGRAM PLC
示例: PROGRAM PLC_PRG VAR END
341 . 错误示例: PROGRAM PLC_PRG VAR i : INT
示例: PROGRAM PLC_PRG VAR x
PROGRAM PLC_PRG VAR ui
示例: PROGRAM PLC_PRG VAR a