O

OR

STL

Starts an ‘Or’-connection by the And-before-Or-rule. Internally ‘O’ is replaced by ‘O(’ without operand. Before the next RLO-evaluating operation the ‘)’ is inserted automatically.

OR with Operand

Combines the value of the operand and the RLO with the operation ‘Or’ and stores the result in the RLO. If the RLO has been evalutated before, the value of the operand will be copied to the RLO without connection.

FBD

The output of the Or-block will be ‘1’ if at least one of the inputs is ‘1’. The Or-block is created by the symbol or via the list and selection of ‘Or’.

LAD

Here the Or-connection is reached by the parallel connection of several contacts. The whole path will be conductive if at least one of the contacts is closed. Using the symbol is the easiest way to create an Or-connection (doing this please note where the yellow cursor is). After inserting the desired contacts by or the branch is closed again by . Before doing this put the yellow cursor on the contact behind which the branch shall be closed again.

See also:

A

AN

A(

AN(

ON

O(

ON(

X

XN

X(

XN(

)

List of operations