You perform mathematical functions in U90 Ladder by using math function blocks. Function blocks are provided for:
The internal operation of a function block is transparent to the user. You simply input the two operands. The result is automatically output by the function block.
The example below shows the Add function block.
Input Operands A & B must be integer values: MI , SI or # constant integer value.
Output Operand C may be a Memory Integer or a System Integer.
You can use an Add function block to assign a real number value to an MI or SI.