Instruments: [Daily Question] January 27, 2011

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This post was last edited by cnooczhouyx on 2011-1-31 08:34. [Daily Question] Question for January 27, 2011: 1. In a PLC, internal relays are actually various types of ( ) with different functions. A. Internal registers B. Physical relays C. Output relays D. Input relays 2. In the hardware structure of a programmable controller, the part that is directly connected to the industrial site is ( ). A. Central processing unit B. Programmer C. Communication interface D. Input/output units Note: 1) The first 50 participants will definitely receive a reward; no additional points will be given for those beyond 50. Among them, the top 20 who answer correctly will receive a ‘Wealth 5’ award, while those from 21st to 50th will get a participation award. Those who answer 3 questions correctly and 2 incorrectly will receive… ； Points can be awarded additionally for detailed analysis, in-depth discussion, and discretion ； 2) Please hide your replies; the method for doing this is at http://bbs.hcbbs.com/thread-492556-1-1.html. Do not edit the replies after posting them. (No rewards will be given for any replies that are not hidden. ) 3) Posts that expire will be closed, and the answers will become visible after the post is closed ； Thank you all for your participation ； 【Daily Question】Answer for January 27, 2011: 1. A 2. D.