5 Function blocks
5.3 BC, data block comparator
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
143
5.3 BC, data block comparator
This function block is available for easy800-SWD from device version 01 and
for easy800 standard devices from device version 04.
The data block comparator (BC = Block Compare) function block compares
two contiguous marker ranges. For this you define the number of bytes to be
compared. The comparison is carried out in byte format for marker types
MB, MW and MD.
easy800 device allows the use of up to 32 data block comparators.
Contacts and Coils
Example of a function block for comparing data blocks:
Figure 105:Wiring the enable coil
Figure 106:Wiring the contacts
Parametric programming of the function block inputs/outputs
When using the function block in the circuit diagram for the first time, use
OK to automatically enter the general display of function block parameters,
as shown in the figure on the left. Enter the function block settings here.
The display contains the following elements:
Contacts
Meaning
BC..EQ
Compared ranges are identical.
BC..E1
The number of compared elements for a marker range are exceeded.
BC..E2
Compared ranges overlap.
BC..E3
Offset of compared blocks outside of the permitted range
Coils
Function
BC..EN
Selective activation of the function block
I 05--------------------------
Ä
BC11EN
BC11E1
o
BC11E2
s
BC11E3
j
-----------------------
Ä
M 48
BC11EQ-BC11EN-----------------
Ä
M 49
BC11 +
>I1
>I2
>NO
BC11
Function block: Data block comparator, number 11
+
Parameter set can be called via the PARAMETERS menu
>I1
Start of comparison range 1; the data block with the start address present at input I1 is compared with
the data block with the start address present at input I2.
>I2
Start of comparison range 2
>NO
Number of elements to be compared in bytes per range, number: 1 - 383
