Siemens S7-300 arbitrary bit data continuous cyclic shift multi-bit program - Database & Sql Blog Articles

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

The input data IN (DWord) of the FC is a double word to be shifted, and Bit_No (Int) is a shift bit number. The output data OUT (DWord) is the result of the shift. In this paper, the low 20-bit data of input IN is continuously cyclically shifted by 1~20 bits as an example. Tmp1 and Tmp2 are used to temporarily store the shifted data and the remaining number of shift times. L1.4 is the 20th bit of Tmp1 (LD0).
Changing L1.4 to other bits of LD0 can change the number of bits of data to be shifted. For example, when changing to L2.4, the number of bits of the shifted data is 12 bits.
L #IN
T #Tmp1 //Save the shifted double word
L #Bit_No
BACK: T #Tmp2 //Save the remaining value of the shift number
L 1
L #Tmp1
RLD // rotate 1 bit
T #Tmp1
AL 1.4
SL 3.0 // The 20th bit of Tmp1 is 1 and the lowest position will be
AN L 1.4
RL 3.0 // The 20th bit of Tmp1 is 0 to reset the lowest bit
CLR
= L 1.4 //Clear the 20th bit of Tmp1
L #Tmp2 //Remove the remaining value of the shift number
LOOP BACK //return 1 and return to non-zero
L #Tmp1
T #OUT // output the result of the cyclic shift

CALL FC 1
IN :=MD10
Bit_No:=MW14
OUT :=MD16
Monitor MD10 and MD16 in hexadecimal format. The value of shift MW14 is preferably an integral multiple of 4. The monitoring is convenient.