Armfield Engineering Education
PROCESS CONTROL TECHNOLOGY
PCT19BR Industrial PLC Unit - issue 6
The Armfield PCT19BR Industrial PLC Unit employs the widely used Allen Bradley SLC500, together with suitable software and hardware connections to allow a multi-channel compatibility with selected instructional equipment from the Armfield range. The Unit accepts up to 6 analogue and 8 digital input signals and provides 2 analogue and 8 digital output signals for use in configuring a wide variety of control loops for study and demonstration.
Ordering Specification
• An industrial PLC (Allen Bradley SLC500) with RS485 and RS232 serial
communications.
• Front panel connections for 2 digital inputs, 2 digital outputs,
2 analogue inputs, 2 analogue outputs, 2 voltage sources and 1 voltmeter.
• Rear panel connectors for 6 analogue inputs, 2 analogue outputs,
8 digital inputs and 8 digital outputs.
• Ladder logic software is provided on disk.
Key Features
> incorporates Allen Bradley SLC500 Industrial PLC
with analogue and digital inputs and outputs
> analogue input PID with analogue and alarm output
> analogue input PID with analogue and time proportioned output
> single and dual loops
> advanced serial communications RS232 and RS485
> ladder logic programming software via PC with or without process connected
Software Provided
Ladder logic software is provided on disk to permit the unit to operate
as:
i) two independent analogue PID controllers
ii) inclusion of digital alarm on one of the PID loops
iii) time-proportioning digital output on one of the loops
Programming the Unit requires a PC (not supplied) with RS232 serial communications
to allow:
i) Setting:
> set-point
> PID control parameters
> alarm value
> direct/reverse acting
> manual/auto PID control
ii) Monitoring:
> process variables
> controller outputs
> alarm conditions
Users may modify or re-write the ladder logic from a PC. Two built-in manually adjustable voltage sources are provided on the front panel to use as inputs to learn and demonstrate ladder logic, with a built-in LCD voltmeter to monitor outputs.
A 9-pin serial cable is provided (for connection to a PC), as is a 6-pin DIN connector to obtain power from Armfield process hardware. (see text under 'Essential Additional Equipment').
Technical Specifications
Allen Bradley SLC500 comprising:
> SL5/02 CPU 4k RAM
> 7 slot I/O rack
> power supply (110/240V ac)
> 2 input - 2 output analog combination module
> 4 way analogue input card
> 16 way TTL input module (8 used)
> 8 way relay output module
> KE communications interface
Communications: Both RS232 and RS485
Ladder logic software: Rockwell RS Logix programming
software for Allen Bradley SLC500 (Windows).
Essential Additional Equipment
- PC with one RS232 serial port running Windows 98, NT4.0 (SP5) or newer,
or XP operating systems
- The PLC unit requires an appropriate item of Armfield Process equipment
in order to supply power to the unit.
The relevant Armfield items are:
> Process Plant Trainer, PCT23MkII
> Distillation Columns, UOP3BM or UOP3CC
> Basic Process Control System PCT40 with Electronic Console PCT43
(see relevant literature for above items)
Suggested Accessories
(1) SCADA Software, PCT23SCADA
This software contains the facilities required to demonstrate SCADA using
the Armfield PCT23MkII and PCT19BR.
It includes:
> SLC500 ladder logic routines written specifically for the PCT23MkII
> The communications facilities to allow the PCT23MkII software to display
and data log the SLC500 parameters
> The additional exercises for the PCT23MkII, allowing SCADA to be demonstrated
in the same manner as the other exercises
(2) Process Control System PCT40
The PLC can be used to control a single loop with a disturbance. Alternative
loops can be configured by the user.
requirements
PCT19BR-A: 220-240V/1PH/50Hz
PCT19BR-B: 120V/1PH/60Hz
PCT19BR-G: 220V/1PH/60Hz
Shipping Specification
Volume: 0.2m3
Gross weight: 49kg
Overall Dimensions
Height: 0.3m
Width: 0.52m
Depth:0.416m
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DATA SHEET
PRODUCT CATEGORY:
Engineering Education
PCT40 Teaching System
PCT40 Ancillary Equipment
It is possible to control the PCT40/41 loops using external PLC devices or PID controllers. These can be connected directly to the PCT40 for specific configurations, however, with the PCT43 electronic console it becomes very easy to connect up the inputs and outputs to enable a range of loops to be demonstrated.
Armfield offer two external units in addition to the PCT43 that can be used for this purpose:
The PCT20H is an example of a typical industrial PID controller that can be found in many large scale process control applications. The controller includes an RS485 interface and RS232 to RS485 converter that allows connection directly to a PC with serial interface.