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1 what is a programmable logic controller plc2 identify four tasks in addition to relay switching operations that plcs
1 explain the differences between open and proprietary plc architecture2 state two ways in which io is incorporated
1 explain the function of the backplane of a plc rack2 what is the function of the optical isolator circuit used in
1 with reference to plc discrete input modulesa what types of field input devices are suitable for use with themb list
1 how does the processor identify the location of a specific input or output device2 list the three basic elements of
1 what is the function of a plc input interface module2 what is the function of a plc output interface module3 with
1 list five factors affecting the memory size needed for a particular plc installation2 what does the instruction set
for the logic gate circuit shown in figure 4-29a determine the boolean equationb draw an equivalent ladder logic
1 what is the most important characteristic of the gray code2 what makes the binary system so applicable to computer
problem -an advanced drinks vending machine allows a mobile user to pay for a drink using a mobile phone billing
answer the following with regard to a ladder logic runga describe the basic makeup of a ladder logic rungb how are the
1 what does the address assigned to an instruction indicate2 when are input branch instructions used as part of a
answer the following with regard to the examine if open instructiona what is another common name for this instructionb
answer the following with regard to the examine if closed instructiona what is another common name for this
1 list the five standard plc languages as defined by the international standard for programmable controllers and give a
1 outline the sequence of events involved in a plc scan cycle2 list four factors that enter into the length of the scan
a what information is stored in the input image table fileb in what form is this information stored2 a what information
1 what does the memory map for a typical plc processor consist of2 compare the function of the plc program and data
1 compare the type of sensor signal obtained from a thermocouple with that from an rtd2 explain how a magnetic reed
1 explain how a tachometer is used to measure rotational speed2 how does an optical encoder work3 explain the function
1 outline the method used to actuate inductive and capacitive proximity sensors2 how are reed switch sensors actuated3
1 what are the two basic components of a photoelectric sensor2 compare the operation of the reflective-type and
1 how does an ultrasonic sensor operate2 explain the principle of operation of a strain gauge3 explain the principle of
study the ladder logic program in figure 7-43 and answer the questions that followa what is the purpose of
identify the type of counter you would choose for each of the following situationsa count the total number of parts