3. 7. It is “programmable” in that the user can set it up to implement a specific set of desired steps, and also include conditional operations which are based on logic statements. It's a solid-state device. 57) Which among the following is/are not suitable for in-system programming? It has one timed coil. The History of Programmable Logic Controllers In the late 1960’s an American company named Bedford Associates released a computing device they called the MODICON . Programmable Logic Array (PLA) PLA is a programmable logic device that has both Programmable AND array & Programmable OR array. Using Programmable Logic and the PALCE22V10 Programmable logic chips (like the PALCE22V10) provide a convenient solution for glue logic and state machine control required by your design. Decide whether each of these statements is True (T) or False (F). A single PAL chip can replace several MSI and SSI parts. A. Increased space requirement c. Increased switching speed d. All of the above. A programmable logic device (PLD) is an electronic component used to build reconfigurable digital circuits.Unlike integrated circuits (IC) which consist of logic gates and have a fixed function, a PLD has an undefined function at the time of manufacture. a. Here, the inputs of AND gates are programmable. Hence, it is the most flexible PLD. 4 Programmable Logic Controllers (PLC) Specifications and System Overview 4.1 General. a. EPROM b. EEPROM c. Flash d. All of the above. C) PLC Ladder logic uses memory bits as internal relays. B) The quantity of internal relays is set by the rack size of the system. 4.1.1 PLC shall be standalone equipment formed of CPU, power supply module, communication module, input/output modules, and programming software as a minimum. D. It … among the following statement/s is/are not an/the advantage/s of Programmable Logic Devices (PLDs)? C. It's a hardwired controller. a. The block diagram of PLA is shown in the following figure. Complete the following statements. That means each AND gate has both normal and complemented inputs of variables. Label the following statements as TRUE or FALSE. A: The PLC can implement Boolean logic operations such as: IF A AND B are TRUE, THEN do D Before the PLD can be used in a circuit it must be programmed (reconfigured) by using a specialized program. Which one of the following statements on PLC 5 and SLC 500 binary bits is NOT true? Most PLCs have a fixed number of timers _____ Normally closed contacts “invert” the state of the signal they reference _____ PLCs are advantageous for use in fixed-circuit or fixed program operations _____ 4. B. 58) Simple Programmable Logic Devices (SPLDs) are also regarded as _____. ANSWER: EPROM. Which of the following statements correctly describes a programmable logic controller? Programmable Array Logic (PAL) b. A) The status of PLC internal relay bits is displayed in the Binary Bit Data File. 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