Omron plc uses electronic ruler or line encoder to measure the length. Omron plc is a compact plc with perfect functions, which can provide high value-added machine control for the industry-leading transportation distributed control. It also has the ability to upgrade through various advanced built-in boards, large program capacity and storage unit, and efficient software development ability in Windows environment. Generally, the length is measured by electronic ruler or line encoder. The resistance ruler can directly measure the absolute length, which is accurate and easy to use. So Omron plc uses electronic ruler or line encoder to measure the length. So Omron plc uses electronic ruler or line encoder to measure the length.