When the [Type] is [Bit Variable], you can
check its operation. Select the operand in Monitor Step and from
the [Controller] menu select either [Force ON (C)] or [Force OFF
(O)]. Or, you can use the operand's shortcut menu.
When the [Type] is [Integer Variable], [Float
Variable] or [Real Variable], you can check the operation by
changing the current value. Select the operand in Monitor Step and
from the [Controller] menu, select [Current Value Editing]. Or, you
can use the operand's shortcut menu.