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Focusing on two characteristics of isolated terminal
Published：2013-12-27 09:31:53 Views：
Facing the deteriorating environment in the control system, a variety of automation instrument due to interference problems have failed, this will require manufacturers to solve this problem as soon as possible. Along with the connection technology is continuously updated, appears isolated Terminal brings Gospel to interference problems, isolated terminals meet the following requirements: 1, addressing a variety of devices, meter potential difference; 2, electromagnetic compatibility problem-solving.
Isolated Terminal in the realization of anti-jamming feature has two basic requirements: electrical isolation and electromagnetic compatibility
Electrical isolation:
Different devices and meters, with different common-mode signal transmission to the DCS, PLC control system, directly, if not addressed, may occur due to signals with "different common-mode" of interference. The so-called "common mode of different" mainly refers to the reference point the potential difference between the signals. Intake/output electrical isolation properties of isolated Terminal so that it is better able to suppress common-mode signals, it will come with the common-mode signal output common-mode signal is not included. So long as each external signal acquisition and control system of plate into the isolation between terminals will be able to solve this topic.
Electromagnetic compatibility:
According to the International Electrotechnical Commission (IEC) to define, electromagnetic compatibility (EMC) is a feature of electronic equipment. Electronic equipment to fulfil its function in an electromagnetic environment without cause intolerable interference.
According to EMC standards requiring quarantine terminals meet: electromagnetic interference environment to work properly, clones can reduce or failure, ensuring accuracy, stability parameter within the specified range. While isolated terminal as electromagnetic disturbances source produces electromagnetic intensity control within the specified range, it less electromagnetic pollution on the environment.
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