Automating Manufacturing Systems - Process Control and ...

plc basic functions - 15.16
EQU
A F8:01
B F8:02
B3:5
01
EQU(value,value) - equal
NEQ(value,value) - not equal
LES(value,value) - less than
LEQ(value,value) - less than or equal
GRT(value,value) - greater than
GEQ(value,value) - greater than or equal
CMP(expression) - compares two values for equality
MEQ(value,mask,threshold) - compare for equality using a mask
LIM(low limit,value,high limit) - check for a value between limits
Figure 15.15
Comparison Functions
The example in Figure 15.16 shows the six basic comparison functions. To the
right of the figure are examples of the comparison operations.