CC-IP0101 51410056-175 Multiline Data Sensors

CC-IP0101 51410056-175 When selecting the industrial digital module needed to capture sensor data, the characteristics of the signal that expresses the results of the sensor’s measurements is the first selection parameter to consider. This parameter is important when deciding whether a counter is required in the digital I/O module you select. The terms suction and pump-out define the control of the flow of DC current in a load. Suck-in devices provide a path to ground for the current and are not responsible for powering the device. Any device whose name includes the terms NPN, open collector, and IEC negative logic is a suction device.

CC-IP0101 51410056-175 Pumped-out devices provide power or a positive voltage that pours current into a load. Any device whose name includes the terms PNP, open emitter, normally low, and IEC positive logic is a pump-out device. The concepts of pump-in and pump-out are independent of the component used to perform the operation (whether the component is a transistor, a mechanical relay, or something else). This concept applies to any DC circuit, but the components used to implement this circuit can have a variety of options.

CC-IP0101 51410056-175 is important for defining the relationship between current and voltage in the open and closed states of a sensor. A sensor can be classified as either a 2-wire sensor or a 3-wire sensor in the following manner. CC-IP0101 51410056-175 connected in series with a data capture device, when the sensor is not activated it draws only a minimum operating current equal to the sensor’s off-state leakage current, also referred to as residual current by some sensor manufacturers. When the sensor is not connected to a data capture device and is connected directly to other loads, the residual current problem does not exist, such as in industrial environments where these 2-wire sensors are often connected directly to motors and motor-like low-resistance devices.