Sinking and sourcing are terms used in PLC/DCS (Programmable Logic Controller/Distributed Control System) to describe the two types of input/output (I/O) connections. In sinking, the load is connected to the positive supply voltage, and in sourcing, the load is connected to the negative supply voltage.
In sinking, the PLC/DCS provides a path to ground for the load, while in sourcing, it provides the voltage to the load. The choice between sinking and sourcing depends on the type of load and the wiring of the system.
Sinking is typically used for loads that have a common positive voltage and require a ground connection. These loads include sensors, switches, and relays. Sourcing is used for loads that have a common ground and require a positive voltage, such as solenoids and motors.
It is important to correctly identify whether a system uses sinking or sourcing, as connecting a load to the wrong type of input/output can result in malfunction or damage to the system. Most PLC/DCS systems are designed to support both sinking and sourcing inputs/outputs, allowing for flexibility in system design and configuration.
In summary, sinking and sourcing are two types of input/output connections used in PLC/DCS systems, and the choice between them depends on the type of load and wiring of the system.
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