PLC EXAM with complete solutions
2024/2025
Identify the correct specifications of resolution available for various analog
inputs. - ANSWER--For 10-V bipolar module, the span is from - 10 to + 10V and the
resolution is 0.3mV.
-For 5-V unipolar modules, the span is from 0 to + 5V and the resolution is 0.3mV.
In a PLC, the memory ________ Refers to an address in the CPU's memory where
a binary word can be stored. - ANSWER-Location
Engineering units - ANSWER-The units a human uses and understands are
known as engineering units.
Transducer units - ANSWER-The transducer units are either a voltage or current.
Binary, raw or machine units - ANSWER-The units the processor requires are
known as binary, raw, or machine units.
Arrange the steps to show how an analog input signal to a PLC from a field
device is processed. - ANSWER-1) The variable -pressure, temperature, etc. -is
converted into a very low-level electric current or voltage signal.
2) The signal is amplified by a transmitter.
3) The signal is input to the analog module.
, Input/output arrangements are built into a(n) ________ PLC. - ANSWER-fixed
Sinking devices - ANSWER--The device will always have a connection directly to
the negative side of the DC power supply.
-Current flows into the device's terminal from the module.
Sourcing devices - ANSWER--The device will always have a connection directly to
the positive side of the DC power supply
-Current flows out of the device's terminal into the module.
Which of the following are true about a discrete input module. - ANSWER--It
sends a signal to the processor indicating which sensor originated the signal.
-It isolates the PLC from fluctuations in the input signal's voltage.
A(n) ________ relay is a control relay used to control a larger load it the output
module of a PLC. - ANSWER-Interposing
In terms of PLC modules, which of the following circuits does the sinking and
sourcing terminology apply to? - ANSWER--DC output circuits
-DC input circuits
Identify the tasks of a discrete input module. - ANSWER--It senses when a signal
is received from a field device.
-It converts the input signal to the correct voltage level for the particular PLC.
Identify the true statements about the outputs of a discrete AC output module in a
PLC. - ANSWER--For controlling larger loads a standard control relay is
connected to the output module.
-Individual AC outputs are limited by the size of the triac to 1A or 2A.
-The maximum current load for any one module is specified.
2024/2025
Identify the correct specifications of resolution available for various analog
inputs. - ANSWER--For 10-V bipolar module, the span is from - 10 to + 10V and the
resolution is 0.3mV.
-For 5-V unipolar modules, the span is from 0 to + 5V and the resolution is 0.3mV.
In a PLC, the memory ________ Refers to an address in the CPU's memory where
a binary word can be stored. - ANSWER-Location
Engineering units - ANSWER-The units a human uses and understands are
known as engineering units.
Transducer units - ANSWER-The transducer units are either a voltage or current.
Binary, raw or machine units - ANSWER-The units the processor requires are
known as binary, raw, or machine units.
Arrange the steps to show how an analog input signal to a PLC from a field
device is processed. - ANSWER-1) The variable -pressure, temperature, etc. -is
converted into a very low-level electric current or voltage signal.
2) The signal is amplified by a transmitter.
3) The signal is input to the analog module.
, Input/output arrangements are built into a(n) ________ PLC. - ANSWER-fixed
Sinking devices - ANSWER--The device will always have a connection directly to
the negative side of the DC power supply.
-Current flows into the device's terminal from the module.
Sourcing devices - ANSWER--The device will always have a connection directly to
the positive side of the DC power supply
-Current flows out of the device's terminal into the module.
Which of the following are true about a discrete input module. - ANSWER--It
sends a signal to the processor indicating which sensor originated the signal.
-It isolates the PLC from fluctuations in the input signal's voltage.
A(n) ________ relay is a control relay used to control a larger load it the output
module of a PLC. - ANSWER-Interposing
In terms of PLC modules, which of the following circuits does the sinking and
sourcing terminology apply to? - ANSWER--DC output circuits
-DC input circuits
Identify the tasks of a discrete input module. - ANSWER--It senses when a signal
is received from a field device.
-It converts the input signal to the correct voltage level for the particular PLC.
Identify the true statements about the outputs of a discrete AC output module in a
PLC. - ANSWER--For controlling larger loads a standard control relay is
connected to the output module.
-Individual AC outputs are limited by the size of the triac to 1A or 2A.
-The maximum current load for any one module is specified.
