PLC1 PMMI Study Set Questions With All
Correct & Verified Answers
1.Describe the function of a programmable logic controller and give an
appli- cation: PLCs are industrial computers that control machines and
other industrial applications. PLCs have replaced hardwired devices,
such as relay coils and con- tacts
2.PLC applications: Assembly
machines Automatic Transfer Lines
Packaging LInes
Robots
3.List the advantages of a PLC: Less
space Lower Cost
Resistance to Environment
Direct Interface
Easy
Programming
Flexible
4.Advantages - Direct Interface: Standard computers require a complex
and limited system to interface to real-world components. A PLC's
interface is directly wired to these components
5.6 Components of a PLC: Input
Modules Output Modules
Processor Module (or
Controller) PLC Power
Supply Programming Device
I/O Chassis
6.Describe the Basic Operation of a PLC: To scan instructions, monitor the
status of input devices, and produce outputs based on the status of the
inputs.
7.Describe how I/O modules communicate with the PLC processor: Each
input, or field device, opens and closes circuits to an individual terminal
on an input module. When an input or output module is configured,
each terminal is assigned a tag that identifies the location of the
terminal status. The input module transmits (multicasts) the data to the
system on a regular basis so that the processor can collect the
information via scan and enact logic/programming based on
input/output data/signal
8.Basic PLC Processor Operation: Controller contains a ladder logic
program that references the tags of the input devices and similar tags
of output devices. The controller then uses that input information to
determine the status of each individual rung of its program. The status
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15
, PLC1 PMMI Study Set Questions With All
Correct & Verified Answers
of the rungs are then transferred to an output tag where the output
module turns the real world devices on and off appropriately
9.Basic Operation of Serial Communication: USB connects a host, which
initi- ates a data transaction with a device. USB groups the binary data
from the host into fields, which are then organized into packets. Packets
are bundled into frames,
2/
15
Correct & Verified Answers
1.Describe the function of a programmable logic controller and give an
appli- cation: PLCs are industrial computers that control machines and
other industrial applications. PLCs have replaced hardwired devices,
such as relay coils and con- tacts
2.PLC applications: Assembly
machines Automatic Transfer Lines
Packaging LInes
Robots
3.List the advantages of a PLC: Less
space Lower Cost
Resistance to Environment
Direct Interface
Easy
Programming
Flexible
4.Advantages - Direct Interface: Standard computers require a complex
and limited system to interface to real-world components. A PLC's
interface is directly wired to these components
5.6 Components of a PLC: Input
Modules Output Modules
Processor Module (or
Controller) PLC Power
Supply Programming Device
I/O Chassis
6.Describe the Basic Operation of a PLC: To scan instructions, monitor the
status of input devices, and produce outputs based on the status of the
inputs.
7.Describe how I/O modules communicate with the PLC processor: Each
input, or field device, opens and closes circuits to an individual terminal
on an input module. When an input or output module is configured,
each terminal is assigned a tag that identifies the location of the
terminal status. The input module transmits (multicasts) the data to the
system on a regular basis so that the processor can collect the
information via scan and enact logic/programming based on
input/output data/signal
8.Basic PLC Processor Operation: Controller contains a ladder logic
program that references the tags of the input devices and similar tags
of output devices. The controller then uses that input information to
determine the status of each individual rung of its program. The status
1/
15
, PLC1 PMMI Study Set Questions With All
Correct & Verified Answers
of the rungs are then transferred to an output tag where the output
module turns the real world devices on and off appropriately
9.Basic Operation of Serial Communication: USB connects a host, which
initi- ates a data transaction with a device. USB groups the binary data
from the host into fields, which are then organized into packets. Packets
are bundled into frames,
2/
15
