Automating Manufacturing Systems - Process Control and ...

plc basic functions - 15.15
A
FAL
Control c_0
length 5
position 0
Mode all
Destination n[c_0.POS + 5]
Expression n[c_0.POS] + 5
array to array
B
FAL
Control R6:1
length 5
position 0
Mode 2
Destination n[c_0.POS + 5]
Expression n[0] + 5
element to array
array to element
C
FAL
Control R6:2
length 5
position 0
Mode incremental
Destination n[5]
Expression n[c_0.POS] + 5
array 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 light is true,
otherwise it is false. Other types of equality functions are also listed.
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