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Features:
-
Two tank liquid level/flowrate control system to provide
invaluable practical experience in the use and application of programmable
logic controllers
-
6 sensor outputs/5 control inputs, each independently and
simultaneously monitored or controlled by external plc to achieve required
process performance
-
Fully supports ladder logic programming using IBM PC (or
compatible) or hand-held programmer
-
Industry relevant training
-
Fully documented with operating instructions and a series
of structured experiments, ranging from PLC fundamentals to advanced
programming and operation
-
Two Year Warranty
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Features:
-
Two tank liquid level/flowrate control system to provide
invaluable practical experience in the use and application of programmable
logic controllers
-
6 sensor outputs/5 control inputs, each independently and
simultaneously monitored or controlled by external plc to achieve required
process performance
-
Fully supports ladder logic programming using IBM PC (or
compatible) or hand-held programmer
-
Industry relevant training
-
Fully documented with operating instructions and a series
of structured experiments, ranging from PLC fundamentals to advanced
programming and operation
-
Two Year Warranty
Description:
Only a few years ago industrial machines and engineering plant containing a
combination of electrical, mechanical, hydraulic and pneumatic systems would
probably have been monitored and controlled by customized electronic circuits
made up of discrete components such as relays, contactors, counters and timers.
These were expensive, potentially unreliable, difficult to maintain and required
major modification if the original operating process needed to be changed.
Programmable Logic Controllers, PLCs, have superseded these controllers. These
are compact microprocessor based devices, which may be connected to a system via
appropriate interfacing. They can then be programmed to input signals from a
number of sensors and then respond in a logical sequential manner to produce a
change in the
ON/OFF state of the actuators and indicators to achieve and maintain the
operation within an envelope. The programmed is retained in memory until updated
so that once set up, the operation is both continuous and repeatable. In this
way, a standard PLC unit equipped with the required number of inputs and outputs
can satisfy many different applications.
The PLC has been so successful in controlling systems that they are now mass
produced, rugged, reliable, low cost items with many more features than their
predecessors, with the additional built-in facility to be re-programmed to suit
changing conditions or requirements.
PLCs are used universally in industries worldwide where ON/OFF sequential
operation achieves and maintains the required operating conditions. They connect
to external equipment, ranging in size and complexity from a single machine to a
complete plant, via appropriate interfaces. Their operation can be programmed
locally by a computer/hand-held programmer or remotely via a network.
There is a need for engineers and technicians to be familiar with PLCs and to be
able to programmed, service and repair PLC based systems. Although the
appearance and size of the PLC may vary from model to model, between
manufacturers and in the style of programming in general, they all have the same
requirement; the need to be connected to a physical system and be programmed
correctly if they are to provide the quality of monitoring and control required.
The experience and skill to be able to achieve this can best be obtained through
practical hands-on use of a PLC connected to a real system.
The CE111 PLC Process has been designed to provide students, and practicing
engineers needing to update their skills, with the essential facilities to gain
invaluable practical experience in the principles and application of
programmable logic controllers. The object of the apparatus is to connect and
programmed an external programmable logic controller to monitor and control the
level and flowrate of water in a two-tank system.
The apparatus comprises two transparent tanks mounted one above the other on a
clearly labelled front panel. A variable speed pump transfers water from a
reservoir sump located in the base of the unit into the upper tank from where it
can drain down under the effect of gravity to the lower tank and then back into
the sump. Strategically positioned solenoid valves may be individually opened or
closed to control and re-direct the movement of the water.
Both tanks include two optical level sensors, operating on the principle of
total internal reflection, positioned to sense maximum and minimum water levels.
An in-line flow sensor provides a pulsed output, the frequency being
proportional to the flowrate and the number of pulses proportional to volume.
LED's adjacent to each input/output socket indicate the on/off supply to the
pump, the open/closed status of each valve, the maximum/minimum level in each
tank and the flowrate.
Low voltage control signals to the pump and solenoid valves as well as the
outputs from the sensors are made at 2mm sockets mounted on the front panel.
An overflow in each tank prevents inadvertent overfilling.
The module is constructed for bench top use in conjunction with an external plc
controller. An umbilical lead connects the unit to the controller to provide the
power supply for the pump and valve solenoids as well as completing the return
path for the inputs/outputs.
Supplied with all essential accessories, example control configuration files for
use with the CE123B (see later) and a comprehensive operating/experimental
manual.
Range of Experiments
The CE111 PLC Process, when used in conjunction with the CE123 PLC
Trainer and optional ancillaries, has been designed to introduce students to the
practical use of PLCs to monitor and control physical systems, commencing with
simple investigations into the components of a typical system and then
progressing in easy stages to more advanced configurations.
The operating/experimental manual supplied with the CE111 includes a series of
recommended structured experiments to achieve this aim. The experimental topics
covered by this equipment include; equipment familiarization, ladder logic
programming and monitoring, level control, sequencing and batch processing.
The CE111 may be controlled manually from the front panel of the CE123 PLC
Trainer using the appropriate switches in each input/output as required, via the
optional CE123A Hand-Held Programmer or the CE123B PLC Operating Software. The
switches can be used to override the actions of the CE123A and CE123B to
introduce fault conditions and the effects investigated.
The experimental manual supplied with the CE111 includes a series of five
structured experiments, starting with the basics of programming a PLC to full
implementation of practical level control, sequencing and batch processing.
The open structure of the CE111 and CE123 allows additional experiments to be
designed, which further test the users understanding of PLC operation and their
applications.
Additional Equipment Required
The CE111 PLC Process requires an external PLC to achieve operation. The
standard option to achieve this is the CE123 PLC Trainer. Manually operated
switches on the front panel of the CE123 may be set to control the input and
output states. This may be extended using the optional CE123A Hand-Held
Programmer or the CE123B PLC Operating Software, both of which support
industrial practice for PLCs with the CE111 PLC Process providing the ideal
training tool. The CE123 switches may then be used to override the actual
input/output states to simulate fault conditions.
CE123 PLC Trainer
The CE123 PLC Trainer has been designed to be fully compatible with the CE111,
providing the essential facilities required investigating the techniques and
practical applications of programmable logic controllers in the monitoring and
control of compatible external systems.
The front panel is clearly labelled and logically presented to provide easy
access to each of the 8 inputs and 6 outputs. Each input/output (I/O) comprises
a 2mm socket and three push-button switches with built in LED indicators. One
switch enables or disables PLC connection to the respective I/O to allow the
other two to be manually set permanently high or low to override normal I/O
status. This allows manual operation of the apparatus or to introduce and study
the effects of system faults. LED's indicate the actual status of the PLC I/O.
A serial I/O socket mounted on the front panel enables connection to the
optional CE123A Hand-Held Programmer or, using the optional CE123B PLC Software,
to an IBM PC, minimum 286 AT or 100% compatible. With either option, full access
is available to program the virtual normally open/closed contacts, timers,
counters and shift registers to create a wide range of ladder logic functions.
Supplied with a connecting lead for the CE123A Hand-Held Programmer, CE123B PLC
Operating Software, sample computer controller configuration files (for use with
CE123B) and a comprehensive operating manual.
CE123A Hand-Held Programmer
An alternative to computer programming of PLC comprising an industrial hand-held
module with LCD display and membrane keyboard which connects to and receives
power from a PLC controller to enable ladder logic programming with up to 8
rungs each with nine contact elements and a coil element, real time monitoring
and diagnostic operations. The programmed is written into battery backed RAM in
the PLC. Supplied with a comprehensive technical and operating instructions.
CE123B PLC Operating Software
Software package to enable an IBM PC, 286 AT or 100% compatible, to program,
real time monitor and perform diagnostic operations when connected to a CE123
PLC Trainer. Programs may be uploaded, downloaded and stored on disc. Supplied
on 3.5" diskette with comprehensive technical and operating manual.
For further information on the CE123, CE123A or CE123B refer to the appropriate
data sheet.
Services Required
The electrical supply for the CE111 PLC Process is supplied from the CE123 PLC
Trainer via an umbilical lead.
The supply requirements for the CE123 are; Single-phase a.c. 230/115V,
1.6/3.15A, 50/60Hz, with earth.
Space Required
For satisfactory operation of a typical CE111 PLC Process and CE123 Trainer
system, a bench area of approximately 1600 x 600mm is required. Any other
equipment being used with the CE111/CE123 such as a computer and its peripherals
in addition to that requires this. The CE111 requires a clearance of 0.9m above
the work area.
Dimensions and Weight
Nett: 560 x 330 x 810mm; 25kg
Gross: 0.92m3; 74kg (approx - packed for export)
Tender Specification
An educational bench mounted apparatus to provide practical experience into the
principles and application of programmable logic controllers when used with an
external programmable logic controller to sense and then control the level and
flowrate of water in a two-tank system.
To comprise two separate transparent tanks, with overflows, mounted vertically
one above the other, each tank to include two internal reflection type optical
level sensors to sense maximum and minimum water levels. A variable speed pump
is to transfer water from a reservoir located in the base of the unit into the
upper tank with an in-line flow sensor providing a pulsed output for flowrate
and volumetric monitoring.
Solenoid operated valves to be individually opened or closed to control the flow
path of the water from the upper tank back to the sump via the lower tank.
Connection for the low voltage control signals to the pump and solenoid valves
as well as the outputs from the flow and level sensors to be made at 2mm sockets
mounted on the front panel, the status of the inputs/outputs being indicated by
adjacent LED's.
An umbilical lead to connect the unit to an external plc controller to provide
the power supply for the pump and solenoid valves as well as completing the
return path for the inputs/outputs.
To be supplied with all essential accessories, comprehensive
operating/experimental manual and a two year parts and labour warranty.
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