MODICON 140CPU11303 Quintessence 140 Series PLC Module

MODICON 140CPU11303 Quintessence 140 Series PLC Module

140CPU11303 may constitute a closed loop. Under the action of a changing magnetic field, an induced current will appear within the shield, interfering with the signal loop through the coupling between the shield and the core. If the system ground and other ground processing confusion, the resulting ground loop current may produce unequal potential distribution on the ground, affecting the normal operation of logic circuits and analog circuits within the PLC. PLC work logic voltage interference tolerance is low, the logic of the ground potential distribution interference easily affects the PLC’s logic operations and data storage, resulting in data confusion, program run or crash. Analog ground potential distribution will lead to a decline in measurement accuracy, causing serious distortion of the signal measurement and control and false action.

140CPU11303 generated by the system’s internal components and circuits between the mutual electromagnetic radiation, such as logic circuits radiate to each other, the analog ground and the logic ground of the interaction and the components of the use of each other mismatch. This all belongs to the PLC manufacturer of the system within the electromagnetic compatibility design, more complex, as the application of the department can not be changed, can not be too much consideration, but to choose the system with more application achievements or tested.

140CPU11303 ensure that the system in the industrial electromagnetic environment from or to reduce the internal and external electromagnetic interference, it is necessary to start from the design stage will take three aspects of suppression measures: inhibit the source of interference, cut off or attenuation of electromagnetic interference propagation pathway, improve the device and the system’s ability to resist interference. These three points are the basic principles of electromagnetic interference suppression. PLC control system anti-interference is a systematic project, the manufacturing unit is required to design and produce products with strong anti-interference capability, and depends on the use of the department in the engineering design, installation, construction and operation and maintenance to be considered in a comprehensive manner, and combined with the specific circumstances of the comprehensive design in order to ensure that the system’s electromagnetic compatibility and operational reliability. Specific engineering anti-interference design, should pay attention to the following two aspects.