Page 63 - Programmable Logic Controllers, Fifth Edition

35. List one application for each of the following intel-
ligent I/O modules: d. location
e. utilization
a. PID module 45. With reference to the I/O image tables:
b. Motion and position control module a. What information is stored in PLC input and
c. Communication module output tables?
36. Write a short explanation for each of the following b. What is the input status of a closed switch
discrete I/O module specifications: stored as?
a. Nominal input voltage c. What is the input status of an open switch
b. Input threshold voltages stored as?
c. Nominal current per input d. What is the status of an output that is ON
d. Ambient temperature rating stored as?
e. Input ON/OFF delay e. What is the status of an output that is OFF
f. Output voltage stored as?
g. Output current 46. Why do PLCs execute memory-checking
h. Inrush current routines?
i. Short circuit protection 47. Compare the memory storage characteristics of
j. Leakage current volatile and nonvolatile memory elements.
k. Electrical isolation
l. Points per module 48. What information is normally stored in the ROM
m. Backplane current draw memory of a PLC?
37. Write a short explanation for each of the following 49. What information is normally stored in the RAM
analog I/O module specifications: memory of a PLC?
a. Channels per module 50. What information is normally stored in an
b. Input current/voltage range(s) EEPROM memory module?
c. Output current/voltage range(s) 51. What are the advantages of a processor that utilizes
d. Input protection a flash memory card?
e. Resolution 52. List three functions of a PLC programming termi-
f. Input impedance and capacitance nal device.
g. Common-mode rejection
38. Compare the function of the CPU and memory sec- 53. Give one advantage and one limitation to the use of
hand-held programming devices.
tions of a PLC processor.
39. With reference to the PLC chassis power supply: 54. What is required for a personal computer to be used
as a PLC programming terminal?
a. What conversion of power takes place within the
power supply circuit? 55. List four important capabilities of PLC program-
b. Explain the term hold-up time as it applies to the ming software.
power supply. 56. How many programs can a PLC have stored in
40. Explain the purpose of a redundant PLC processor. memory at any one time?
41. Describe three typical modes of operation that can 57. Outline four functions that an HMI interface screen
be selected by the keyswitch of a processor. can be configured to perform.
42. State five other functions, in addition to simple 58. List the four major tasks in the development of an
logic processing, that PLC processors are capable HMI application.
of performing. 59. What information does an HMI trend display
43. List five important procedures to follow when han- convey?
dling static-sensitive PLC components. 60. Define the term scaling as it applies to PLC inputs
44. Define each of the following terms as they apply to and outputs.
the memory element of a PLC: 61. What is the function of a transducer?
a. writing 62. In a tag based PLC memory structure, what is the
b. reading function of a base tag and an alias tag?
c. bits

44 Chapter 2 PLC Hardware Components

pet73842_ch02_017-045.indd 44 03/11/15 3:44 PM