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Standard function blocks
178
02/16 MN05013001Z EN
Contacts
The contacts of the function block are evaluated in the
standard circuit diagram. A closed contact indicates:
Memory requirement
The analog value comparator function block requires 68
bytes of memory plus 4 bytes per constant at the function
block inputs.
Operation of the function block
The function block compares values present at the inputs >I1
and >I2. You control the comparison in the function block by
setting other input parameters:
• Multiplication factors >F1 and >F2 for the comparison
values 1 and 2,
• Offset of comparison value 1 via function block input >OS,
• Application of a switch hysteresis to comparison value 2
on >HY.
Contact Q1 indicates the comparison result “greater”,
“equal to” or “less” depending on the set operating mode.
Contact CY closes if the value range is exceeded. If an out-
of-range value is signalled with CY = 1, Q1 remains in state
0. With the following formulae you can calculate the
permissible value range.
– 2
31
F
I1
x
F1 + OS
F
(2
31
– 1)
l
CY = 0
– 2
31
F
I2
x
F2 + HY
F
(2
31
– 1)
l
CY = 0
– 2
31
F
I2
x
F2 – HY
F
(2
31
– 1)
l
CY = 0
The following signal diagram illustrates the function:
Parameters
Function
A ..Q1
Comparison value reached
A ..CY
Value range exceeded
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