CATALOG NUMBER OF PLC

            The micrologix 1000 programmable controller is a package controller that contains an input circuit, output circuit, a controller and a memory. It is available in 10 IO’s , 16 IO’s and 32iO’s configuration. It is also available in Analog and Discrete IO’s.

1761 – L - 16ABB - 5A

1761- Bulletin Number

L – Base unit

16ABB

16 -   No. of IO’s

A -    Input Signal

          A= 120v

          B= 24v

B –   Output type

          A= Relay Type

          B= TRIAC

         W= Mosfet Type

         X= 50% Relay

               50% Mosfet

B –   Power Supply

         A= 120v

         B= 240v

5A

5 - No. of IO’s

A - A=Analog

       D= Discrete

Pin Diagram of PLC

  

(1) DC Common:-  To complete an electronic circuit we need to give 0 volt supply at same point.

          In our circuit we give that supply at DC common.

          One DC common is used after 4 Inputs.

(2) Input/0 to Input/5:- From 0 to 5 we have 6 input pins where we will connect our different types of input source like Switches, Sliders, Sensors etc.

(3)  +24, -24 volt:- Here we will get the supply from SMPS, which is required for the proper working of our PLC.

(4)    Ground:- This is our ground pin which is basically used for earthing purpose.

(5)   Output/0 to Output/3:- from 0 to 3 we have four output pins where we will connect our different output sources like LED, Motor, Buzzer etc.

  (i) Among these four Outputs Two of them are relay and other two are MOSFET TYPE.

 (ii)  Relay type are used for slow switching.

(6)  NU:- These are our not used pins where we will connect our different type of external source like relay, contractor etc.

LED’s of PLC:-

(I)               RUN:- A yellow LED will glow here when our program is properly downloaded & ready to be execute.

(II)           POWER:- A yellow LED will glow here when our PLC is getting proper power which is required for its proper working.

(III)        FAULT:- A red LED will blink here when there will be any short circuiting in the circuit and our PLC is not getting proper power supply which is required for its proper working.

(IV)        FORCE:- If we forcelly want to ON or OFF any switch through a software then we can use the option force ON or OFF.

CABLE:- Name of cable that we use is

               AB  DF 1.1 0H 485

Switching

SWITCHING IN PLC

We basically have three types of switches:

(i)                 Momentary Switch

(ii)               Latch Switch

(iii)             Float Switch

Among these three types of switches two of them are

DIGITAL SWITCHES

ANALOG SWITCHES

(I)               Momentary Switch:- These Switches are of two types:

(1)   Normally Open (Examine if Closed)

(2)   Normally Closed (Examine if Open)

(II)       Latch Switches:-

                 These are reverse two way switches which we use at our home in bed room in stairs.

(II)           Float Switches:-

These are reverse along switches whose value varies.

(1) Normally Open:-

          An input can be a connected switch closure or sensor, a contact from a connected output, or a contact from an internal output. When interpreted, the referenced input or output is examined for an ON condition. If its status is 1, the contact will close and allow current to flow through the contact. If the status of the referenced input/output is 0, the contact will remain open, prohibiting current from flowing through the contact.

(2) Normally Closed:-

          An input can be a connected switch closure or sensor, a contact from a connected output, or a contact from an internal output. When interpreted, the referenced input/output is examined for an OFF condition. If its status is 0, the contact will remain closed, thus allowing current to flow through the contact. If the status of the referenced input/output is 1, the contact will open, prohibiting current from flowing through the contact.

Operation Cycle of PLC

Operation Cycle :- 

             The operation will occur after the successful downloading of our program into the PLC and in this we will define all the different process performed by the controller.

It includes

(i)                 Input Scan

(ii)               Program Scan

(iii)             Output Scan

(iv)             Communication Services

(v)               House Keeping  

(I)               INPUT SCAN:-  

            In this process our controller will read the data and checks the types of input that have been used in any process the time required for this process will be in micro seconds.

(II)           PROGRAM SCAN:-

              In this process our controller will checks the logics and  instructions that have been used. The time required for this operation depends upon the number of instructions used in any program.

(III)        OUTPUT SCAN:- 

           In this process our controller will writes the data that will considered as an output. The time required for this process will also be in micro seconds.

(IV)        COMMUNICATION SERVICES:-

           In this process our controller checks the communication with other devices i.e. Laptop/PC.

NOTE:-   In Micrologix 1000, we have

Internal timers=40

External counters=32

 If more internal timer or counter have been than there will be an error.