plc gate
الأربعاء، 4 يوليو 2012
Analog Inputs and Outputs
Analog Inputs and Outputs
Analog inputs and outputs are continuous, variable signals.
Typical analog signals vary from 0 to 20 milliamps, 4 to
20 milliamps, or 0 to 10 volts.
In the following example, a level transmitter monitors the level
of liquid in a storage tank and sends an analog signal to a PLC
input. An analog output from the PLC sends an analog signal to
a panel meter calibrated to show the level of liquid in the tank.
Two other analog outputs, not shown here, are connected to
current-to-pneumatic transducers that control air-operated flowcontrol
valves. This allows the PLC to automatically control the
flow of liquid into and out of the storage tank.
Typical analog signals vary from 0 to 20 milliamps, 4 to
20 milliamps, or 0 to 10 volts.
In the following example, a level transmitter monitors the level
of liquid in a storage tank and sends an analog signal to a PLC
input. An analog output from the PLC sends an analog signal to
a panel meter calibrated to show the level of liquid in the tank.
Two other analog outputs, not shown here, are connected to
current-to-pneumatic transducers that control air-operated flowcontrol
valves. This allows the PLC to automatically control the
flow of liquid into and out of the storage tank.
PLC Scan
The PLC program is executed as part of a repetitive process
referred to as a scan. A PLC scan starts with the CPU
reading the status of inputs. Next, the application program is
executed. Then, the CPU performs internal diagnostics and
communication tasks. Finally, the CPU updates the status of
outputs. This process repeats as long as the CPU in the run
mode. The time required to complete a scan depends on the
size of the program, the number of I/Os, and the amount of
communication required.
referred to as a scan. A PLC scan starts with the CPU
reading the status of inputs. Next, the application program is
executed. Then, the CPU performs internal diagnostics and
communication tasks. Finally, the CPU updates the status of
outputs. This process repeats as long as the CPU in the run
mode. The time required to complete a scan depends on the
size of the program, the number of I/Os, and the amount of
communication required.
Actuators
Actuators are devices that convert an electrical signal from a
controller, such as a PLC, into a physical condition. Actuators are
connected to the PLC output. A motor starter is one example of
an actuator that is often connected to a PLC output. Depending
on the status of the PLC output, the motor starter either
provides power to the motor or prevents power from flowing to
the motor.
controller, such as a PLC, into a physical condition. Actuators are
connected to the PLC output. A motor starter is one example of
an actuator that is often connected to a PLC output. Depending
on the status of the PLC output, the motor starter either
provides power to the motor or prevents power from flowing to
the motor.
Sensors
Sensors are devices that convert a physical condition into an
electrical signal for use by a controller, such as a PLC. Sensors
are connected to the input of a PLC. A pushbutton is one
example of a sensor that is often connected to a PLC input. An
electrical signal indicating the condition (open or closed) of the
pushbutton contacts is sent from the pushbutton to the PLC.
electrical signal for use by a controller, such as a PLC. Sensors
are connected to the input of a PLC. A pushbutton is one
example of a sensor that is often connected to a PLC input. An
electrical signal indicating the condition (open or closed) of the
pushbutton contacts is sent from the pushbutton to the PLC.
Scada
(Scada)
Supervisory Control And Data Acquisition
A supervisory control and data collection.
And that as is well known there are many companies that have the equipment
Control to which they relate, so each company, it is the (scada) which
Of their own and despite the large number of these companies and the breadth of the (scada)
Are very similar to have, but each company software programs
Their own, as it has become today and you can place you are sitting on the
Computer in the lab that monitors and inspects all the equipment and all
Events, data collection and interaction with, and you can also
Operated and separating equipment and see the course of its work in theory and as if you
Next to it, and see the faults on the computer, as well as work programs
Immediate warning in the event of faults and follow-up very quickly, and if
Needed to link the warning device cell phone.
Where this technique has become present in all the modern facilities of
(Factories, hotels, ships, submarines, and aircraft, and facilities
Industrial, etc.)
This technique consists of programs designed to draw diagrams similar to
The existing situation of such facilities in the rooms Almoakn (ie, drawing
Motors, pumps, basins, pipes draw match
In fact, his image in it, and draw all exits
(Outputs) and entrances (inputs) so as to compensate for exits
Orders are similar to reality (on) (off) or word (ÔŰÇá, Detached)
If the exits and entrances of any logical (digital), if either
The entrances and exits of any analog (analog) Faismm ties
Such as symmetry, (from - and to) are placed so that the value of small and value
Represent a great value given by the (exits) and (Portlets) analogue,
Possible and that these relations in the form of numbers or in the form of fee
My mobile (ie, relative).
As these companies draw a wide variety of Alawamarwalrsumaat
Images representing the motors, pumps, pipes and basins
And Alhawwabs, fans and all Maiktr to mind of the devices,
And equipment, so you choose the appropriate fee to the tool you want
And put them in the right place in the scheme, and also there are programs
Such as the
(Paint) can be used directly in the formulation of this scheme
Accurate way to suit the ground.
And there is a lot of places designed for these devices shall be binding
Including through the protocols, these companies
Designed to transfer the information collected to extract them and the way that
Institutions used to fit these programs.
This facility is a file for the company (direct soft) is called
(Lockout direct) mimic the reality in which we spoke this curse.
Supervisory Control And Data Acquisition
A supervisory control and data collection.
And that as is well known there are many companies that have the equipment
Control to which they relate, so each company, it is the (scada) which
Of their own and despite the large number of these companies and the breadth of the (scada)
Are very similar to have, but each company software programs
Their own, as it has become today and you can place you are sitting on the
Computer in the lab that monitors and inspects all the equipment and all
Events, data collection and interaction with, and you can also
Operated and separating equipment and see the course of its work in theory and as if you
Next to it, and see the faults on the computer, as well as work programs
Immediate warning in the event of faults and follow-up very quickly, and if
Needed to link the warning device cell phone.
Where this technique has become present in all the modern facilities of
(Factories, hotels, ships, submarines, and aircraft, and facilities
Industrial, etc.)
This technique consists of programs designed to draw diagrams similar to
The existing situation of such facilities in the rooms Almoakn (ie, drawing
Motors, pumps, basins, pipes draw match
In fact, his image in it, and draw all exits
(Outputs) and entrances (inputs) so as to compensate for exits
Orders are similar to reality (on) (off) or word (ÔŰÇá, Detached)
If the exits and entrances of any logical (digital), if either
The entrances and exits of any analog (analog) Faismm ties
Such as symmetry, (from - and to) are placed so that the value of small and value
Represent a great value given by the (exits) and (Portlets) analogue,
Possible and that these relations in the form of numbers or in the form of fee
My mobile (ie, relative).
As these companies draw a wide variety of Alawamarwalrsumaat
Images representing the motors, pumps, pipes and basins
And Alhawwabs, fans and all Maiktr to mind of the devices,
And equipment, so you choose the appropriate fee to the tool you want
And put them in the right place in the scheme, and also there are programs
Such as the
(Paint) can be used directly in the formulation of this scheme
Accurate way to suit the ground.
And there is a lot of places designed for these devices shall be binding
Including through the protocols, these companies
Designed to transfer the information collected to extract them and the way that
Institutions used to fit these programs.
This facility is a file for the company (direct soft) is called
(Lockout direct) mimic the reality in which we spoke this curse.
الاثنين، 2 يوليو 2012
Different means for programming the PLC devices
Different means for programming the PLC devices
Different means for programming the PLC devices
Are programming in several ways, including:
1 - a special programming device enters the program within the memory device.
2 - through a screen and a bunch of keys on the front of the device.
3 - through a program that is downloaded from your computer.
Are programming in several ways, including:
1 - a special programming device enters the program within the memory device.
2 - through a screen and a bunch of keys on the front of the device.
3 - through a program that is downloaded from your computer.
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