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. B) The quantity of internal relays is set by the rack size of the system. It has one timed coil. 3. among the following statement/s is/are not an/the advantage/s of Programmable Logic Devices (PLDs)? It's a solid-state device. That means each AND gate has both normal and complemented inputs of variables. The block diagram of PLA is shown in the following figure. Q: What does “programmable logic” mean in this context? 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. D. It … A) The status of PLC internal relay bits is displayed in the Binary Bit Data File. a. Short design cycle b. Programmable Logic Array (PLA) PLA is a programmable logic device that has both Programmable AND array & Programmable OR array. B. 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. a. EPROM b. EEPROM c. Flash d. All of the above. Decide whether each of these statements is True (T) or False (F). 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. 57) Which among the following is/are not suitable for in-system programming? Before the PLD can be used in a circuit it must be programmed (reconfigured) by using a specialized program. C) PLC Ladder logic uses memory bits as internal relays. ANSWER: EPROM. A. 4 Programmable Logic Controllers (PLC) Specifications and System Overview 4.1 General. Which one of the following statements on PLC 5 and SLC 500 binary bits is NOT true? Which of the following statements correctly describes a programmable logic controller? A single PAL chip can replace several MSI and SSI parts. C. It's a hardwired controller. A: The PLC can implement Boolean logic operations such as: IF A AND B are TRUE, THEN do D Label the following statements as TRUE or FALSE. Hence, it is the most flexible PLD. 58) Simple Programmable Logic Devices (SPLDs) are also regarded as _____. Programmable Array Logic (PAL) b. Here, the inputs of AND gates are programmable. Increased space requirement c. Increased switching speed d. All of the above. 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 . 4.1.2 PLC vendor shall provide the system software and associated equipment, interface tools and required cables. Generic Array Logic (GAL) c. 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