FATEK FBs-CB2 - CONVERTING THE RAW VALUE OF 4～20 MA ANALOG INPUT (FUN32 ADCNV)

Advanced Function Instruction
7-11
FUN32
ADCNV
CONVERTING THE RAW VALUE OF 4～20MA ANALOG INPUT
（ADCNV）
FUN32
ADCNV
Pl :
N :
EN
Ladder symbol
32.ADCNV
S :
D :
F/T
Operation Control
14/12 - Bit Selection
HR IR ROR DR K
Range
Ope-
rand
R0
∣
R3839
R3840
∣
R3903
R5000
∣
R8071
D0
∣
D4095
Pl 0~1
S ○ ○ ○ ○
N ○ ○ ○ 1~64
D ○ ○* ○
Pl：0, the polarity setting of analog input module is at unipolar
position
：1, the polarity setting of analog input module is at bipolar
position
S：Starting address of source registers
N：Quantity of conversion (In Word)
D：Starting address of destination registers
S, N, D may associate with V、Z、P0~P9 index register to serve
the indirect addressing application.
● When the analog input is 4～20mA, the analog input module is one of the solution to get this kind of signal,
but the input span of the analog input module is 0～20mA (Setting at 10V、Unipolar), however there will exist
the offset of the raw reading value; this instruction is applied to eliminate the offset and convert the raw
reading value into the range of 0～4095(12-bit) or 0～16383(14-bit), it is more convenient for following
operation.
● When execution control "EN"=1, it will execute the conversion starting from S, length by N, and then store
the results into the D registers.
● This instruction will not act if invalid length of N.
● When the input〝F/T〞=0, it assigns the 12-bit analog input module; while〝F/T〞=1, it assigns the 14-bit
analog input module.
Example：
M0
32.ADSNV
EN
N :
D :
S :
F/T
P1 :
0
R3840
R500
6
Description：When M0 is ON, it will perfom 6 points of conversion starting from R3840, where the offset of 4～
20mA raw reading value will be eliminated, and the corresponding value 0～4095 will be stored into
R500～R505.
S D
R3840
－1229
R500
0
(4 mA)
R3841 409 R501 2047 (12 mA)
R3842 2047 R502 4095 (20 mA)
R3843
－2048
R503 0 (0 mA)
R3844
－2048
R504 0 (0 mA)
R3845
－2048
Ö
R505 0 (0 mA)