Ohjausvirralle

Ohjausvirralle is a Finnish term used in automation and electronics to denote the destination or channel of a control signal. It is the illative/dative form of ohjausvirta (control current), and in technical texts it is used to describe the signal path “to” or “for” the control input or device being driven.

In practice, ohjausvirta refers to the electrical signal that governs a device’s operation. The signal can be voltage- or current-based, and common standards include 0–10 V or 4–20 mA current loops. The exact specifications depend on the equipment and the control architecture. Ohjausvirralle thus designates the specific input or interface that receives the control signal from a controller, PLC, sensor, or control module.

Applications of the concept span automation, process control, instrumentation, and robotics. It helps distinguish the control path from measurement or feedback signals within a system. Proper handling of ohjausvirralle involves ensuring compatibility of signal type and level, appropriate impedance or input thresholds, and adequate isolation and protection. Design considerations include noise immunity, signal integrity, polarity awareness, and safeguards against surges or faults to maintain safe and reliable operation.

Etymology-wise, the term combines ohjaus (control) and virta (current) with the -lle suffix indicating direction toward the target element. The concept is a standard part of Finnish technical vocabulary when describing interfaces between controllers and controlled equipment.