5 Function blocks
5.19 LB, jump label
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
213
5.19 LB, jump label
Within the function block list jump label LB.. is the jump target for a
conditional jump with function block JC.. . The function blocks JC and LB are
always used in pairs in the circuit diagram.
easy800 device allows the use of up to 32 jump labels.
Function Block
Because function block LB.. acts only as a jump target, it does not have to be
linked in the circuit diagram and does not have to be parameterized. It has
neither coils nor contacts and is simply placed at the required position in the
function block list.
In the function block list a jump label must be positioned downstream, i.e.
towards the end of the list when viewed from associated function block
“conditional jump”. If it is placed in front of the associated jump location
(backward jump), the program branches to the end of the function block list
and fault contact JC..E1 of function block “conditional jump” closes. If no
associated jump label is set in the function block list, the program jumps to
the end of the list and fault contact JC..E1 also closes.
Enter the function block editor from the main menu via <PROGRAM… ->
PROGRAM -> FUNCTION RELAYS>.
▶
In this menu use the cursor buttons
ÍÚ
to move to the location to which
the jump is to be made and press OK.
▶
Then use the cursor keys
ÍÚ
to select function block LB.. and close the
input dialog with two clicks on OK.
The description of the JC.. conditional jump function block is provided in
Chapter 5, “Function blocks“ from Page 211. This also contains an
example.
￫
A corresponding JC.. function block (conditional jump) must
exist for every LB.. function block. Conditional jump JC01, for
example, is always associated with jump label LB01.
