Automating Manufacturing Systems - Process Control and ...

plc basic functions - 15.15
A
FAL
Control R6:0
length 5
position 0
Mode all
Destination #N7:5
Expression #N7:0 + 5
file to file
B
FAL
Control R6:1
length 5
position 0
Mode 2
Destination #N7:5
Expression N7:0 + 5
element to file
file to element
C
FAL
Control R6:2
length 5
position 0
Mode incremental
Destination N7:5
Expression #N7:0 + 5
file to element
Figure 15.14
File Algebra Example
15.3 LOGICAL FUNCTIONS
15.3.1 Comparison of Values
Comparison functions are shown in Figure 15.15. Previous function blocks were
outputs, these replace input contacts. The example shows an EQU (equal) function that
compares two floating point numbers. If the numbers are equal, the output bit B3:5/1 is
true, otherwise it is false. Other types of equality functions are also listed.