Siemens S7 Address Registers AR1 and AR2 in Siemens STL скачать в хорошем качестве

Siemens S7 Address Registers AR1 and AR2 in Siemens STL

LARn loads an area pointer into address regsiter Arn,As the source you can select an area interenal or area crossing pointer or a doubleword from address area bit memory,temporary local data,global data and instance data. LAR2 P#20.0 //Load AR2 with P#20.0 L P#24.0 LAR1;Loads AR1 with Acc1 If you does not provide an address LARn loads contents of Accumlator 1 LAR1 MD120 TARn transfers complete ARn.As the destination you can specify a double word from address areas bit memory,tempary local data TAR2 MD140 transfer AR2 to MD140 TAR1; transfer to ACC1 If you use the programming options below together with the registers and accumulators listed, you must make sure you restore the contents of the registers or accumulators yourself, otherwise errors may occur. Using the following higher-language constructions may cause the contents of the DB register and address register AR1 to be modified: Fully-qualified DB access (for example, DB20.DBW10) as an actual parameter for a function (FC) Function block (FB) and multiple-instance calls Structure components of a formal parameter as an address within an FC or FB Structure components of a formal parameter as an actual parameter for an FC or FB With FB, FC, and multiple-instance calls, you should not use the RLO or accumulator 1 or 2 as additional (implicit) parameters. The DI register and address register AR2 are used on the system side for the FB and multiple-instance calls and should not therefore be modified within FBs. Address register AR1 is used by some of the loadable standard blocks. The command "L P#parameter_name" loads the address offset of the specified parameter within an FB, relative to address register AR2. In order to determine the absolute offset in the instance data block in multiple-instance type FBs, you must also add the area-internal pointer (address only) of the AR2 register to this value. You can find further information on the CPU registers in the help on the programming language (LAD/FBD/STL).