CONTROLOGIX 5000 SYSTEM COMPONENTS IDENTIFICATION


I: Introduction to Allen-Bradley Control Systems Family

Allen-Bradley control systems:

1. PLC System: Programmable Logic Controller.
Allen-Bradley line of processors identified by prefix PLC. (e.g., PLC-2®, PLC-3®, and PLC-5® processors)

2. SLC™ System: Small Logic Controller.
Allen-Bradley line of processors with flexibility and power of large processor in size and simplicity of small processor. (e.g., SLC 500, SLC 5/01, SLC 5/05 processors).

3. Logix5000™ System: can integrate
– Sequential
– Motion
– Drive
– Process control

Logix5000 control engine available in several platforms/physical formats:

• ControlLogix® - High-performance, multi-controller modular chassis
• FlexLogix™ - Distributed-control
– (i.e., control platform is located at or close to the process/machine.)
• CompactLogix™ - Small modular stand-alone to medium sized
• DriveLogix™ - Distributed drive control
• SoftLogix™ - Combines control, information, visualization on open-control system
– (e.g. control engine housed in computer/other terminal.)
Logix 5000 Family

NOTE: ALL LOGIX5000 PLATFORMS WERE PROGRAM BY USING RSLOGIX5000 AS THEY HAVE THE SAME CONTROL ENGINE:



II. Control Logix 5000 Hardware Platform:


• High-performance
• Multi-controller system
• Modular chassis format
• Easy integration with any existing systems (i.e., PLC-5®, SLC™)
• Capable of high-speed communications and data-transfers
• Allow multiple controllers, I/O modules, and communications modules in any order/location within chassis
PLC Complete Hardware Modular Assembly

III. Control Logix 5000 Chassis Hardware Assembly.

• Controllers
• I/O
• Communications modules
• Power supply

PLC Chassis Hardware Modular Assembly

NOTE: LOGIX 5000 PLC IS A MODULAR TYPE HENCE EVERY MODULE CAN BE INSERTED INTO THE CHASSIS BY MEANS OF A SLOT.


IV. Standard Sizes Of Control Logix Chassis.

ControlLogix chassis sizes:

• 4-slot
• 7-slot
• 10-slot
• 13-slot
• 17-slot 
10 Slot PLC Chassis
Slots numbered from left to right starting with 0:


NOTE: 1756 (ControlLogix) MODULES ARE NOT SLOT DEPENDENT (i.e., ANY 1756 MODULE CAN BE PLACED IN ANY SLOT IN THE CHASSIS).




V. Control Logix PLC Backplane.

Also known as ControlBus™ backplane:

• Printed-circuit board at back of chassis
• Provides electrical interconnection between modules


Control Logix Backplane


NOTE: THE BACKPLANE ALLOWS DATA TO BE MULTICAST (i.e., SENT ONCE AND RECEIVED SIMULTANEOUSLY BY MULTIPLE DESTINATIONS).


VI. Control Logix Processor.

32-bit controller that combines logic and data in modular memory:

Control Logix CPU

Controllers have two main internal components:

• Central Processing Unit (CPU): The decision making component that executes the program stored in memory.
• Memory: A group of circuit elements where programs and data are stored.


NOTE: WHEN POWER IS TURNED OFF, THE BATTERY WILL MAINTAIN THE CONTROLLER MEMORY.


VII. 1756-I/O modules provide input/output capability to many applications

I/O modules offer the following capabilities:
  • Easy configuration using a wizard
  • Electronic module identification (keying)
  • Scaling of analog values
  • Diagnostics (depending on the module)

Wiring from process/machine connected to I/O modules through one of the following special devices:
  • RTB (Removable Terminal Block): field wiring connector for I/O modules.
   – Connected to RTB rather than directly to terminal block
  • IFM (Prewired Interface Module): field wiring arm that uses prewired/factory wired cable to connect to I/O module.


VIII. Communications Modules

Used for creating communications between controller and network:

Network and their Required Communications Module
  • EtherNet/IP™  - 1756-ENBx
  • ControlNet™  - 1756-CNB, CNBR, 1756-CN2, CN2R
  • DeviceNet™  - 1756-DNB
  • Data Highway Plus™ (DH+™) or Universal Remote I/O - 1756-DHRIO

NOTE: FOR SERIAL COMMUNICATION, THE WORKSTATION CAN BE DIRECTLY CONNECTED TO THE CONTROLLER VIA RS232.






Different Network Protocols Used



Modular format allows users to design, build, and modify flexible systems:
  • Select the number of controllers and appropriate memory size
  • Select the number and type of I/O modules
  • Select the number and type of communications modules

System can range in complexity:
  • Simple stand-alone controller and I/O modules in a single chassis.
  • Complex system with multiple controllers, chassis, and networks in different locations.


NOTE: INDIVIDUAL UNITS CAN BE CONFIGURED, REPAIRED, AND REPLACED DUE TO ITS MODULARITY CONCEPT.

1 comment:

  1. Hence in the simplistic terms it can be said that in terms of the feedback control loop the RTU or PLC are simply passing points of the overall monitoring function whereas the SCADA system is completely responsible for monitoring the complete routine and the overall performance of the loop. plc system

    ReplyDelete