Several methods of realizing high-low byte or high-low word exchange in TIA botu s7-1200

TIA Portal S7-1200 Several methods of realizing high-low byte or high-low word exchange in

for example S7-1200 When communicating with some upper computers , The storage mode of read-write floating-point numbers is different from that of the upper computer , That is, high and low words or bytes are opposite , The data read at this time is incorrect , You need to change the high and low characters , Can display normally .

The following is a summary of several methods of high-low word or byte Exchange , For your reference .
stay TIA On the way to bo , A floating point data REAL, Occupy 4 Bytes , namely DWORD.

With DWORD Take the high and low word exchange of as an example （WORD The high and low bytes of are the same ）：

One 、 Through indirect addressing , How to access fragments

As shown in the figure below , Create a new one FC block , The interface variables of the block are shown in the following figure ,SCL The procedure is shown in the figure below , Assign the high word of the input variable to the low word of the output variable , The low word of the input variable is assigned to the high word of the output variable

Add two variables to the data block inputData and outputData, The data type is Real floating-point , As shown in the figure below ,