Lab 10 Data Manipulation.pdf - Programmable Logic Controllers

Chapter

Lab 10

Programmable Logic Controllers

Lab 10 Data Manipulation

Data Manipulation

Reading DataStoring DataRetrieving DataMoving from one file to anotherCopying DataModifying the dataApplying Math functionsApplying Comparing FunctionsLoading and reading FilesSending data over Ether-Net

Manipulations of Data Examples of Data

Data Manipulation

Data Manipulation is Mostly at the word level.

Data can be Bits or Words

If data is greater than a bit (0 or 1)data will be a word. (16 Bits)

The PLC Memory is 16 bits (0-15) Memory can be viewed in Binary, BCD/HEX, or Decimal.

Bit Level:

Bit I:0/5 or Bit I:0.0/5

Word Level

Word I:0.0 or O:7.0

Bit Level: Input a bit for a pushbutton I:0/5

Word Level: Needs more than one bit. The number 7 from a thumbwheel switch in binary (BCD) requires the word level.

111 = 7

Word I:0.0

Bit I:0/5orBit I:0.0/5

Data Manipulation

Data Manipulation – Compare Instructions

Data Manipulation – Move/Logical

Data Manipulation – File/Misc.

Data Manipulation - Math

Data Manipulation

Chapter

Lab 10-1


Loading a Counter (with Thumbwheel Switch)

Masking Explained

Masking is like ANDing each bit.

A “0” on B and “A” is blocked – always a 0.

A “1” on B and “A” passes through.

A and 0 = A A can be a 1 or 0

Masking Explained

<- Data (263 decimal)

<- Mask Word (000F)

<- Result (7 decimal)

Several Instructions such as the Mask Move instruction, Sequencer Instructions, File instructions, Etc have the ability to block bits of data using MASKING. In the example below, a thumbwheel switch is set to 7, however switch 8 is on making the data 263. Masking blocks the switch.

MVM (Masked Move) Instruction

The Move (MOV) and Masked Move (MVM) Instruction

Load a Counter with the Thumbwheel Switch

Thumbwheel Switch wired to slot 0 word 0

Mask allows only bits 0,1,2,3 to be moved

Move TW Switch data into preset of counter

Chapter

Lab 10-2


Loading a Counter (with a Pushbutton)

Load a Timer with a Pushbutton Switch

Pulse Counter

Move Counter ACC value to Timer PRE value

Turn on Timer

Turn on a light when the timer is done

Reset Timer

Chapter

Lab 10-3


Loading 2 Timers with one Thumbwheel Switch

Load Two Timers with One Thumbwheel Switch

Set Thumbwheel then pressThe press pushbutton #6 to move thumbwheel data to T4:0.pre

Set Thumbwheel then pressThe press pushbutton #7 to move thumbwheel data to T4:1.pre

Turn on switch 8 to starts timers generating a pulse train.

Note: Using only one decimal digit on the thumbwheel switch the range of timing is 1-9 seconds each.

Chapter

Lab 10-4


Compare Instructions

Compare Instructions Controlling a Sequence

Time driven sequence using one timer, LIM. EQU, GTR & GEQ

Presenter

Presentation Notes

This is a time driven sequence that control two cylinders using Greater than, Less than, Limit Test, and Equal instructions. Rung 1: Turn on the switch and the timer starts incrementing every second. Rung 2: the light will be on for the first 6 seconds. Rung 3: The single solenoid valve extents piston one for seconds 1-3 then retracts. Rung 4: Piston two extends on the 4 second and stays extended for second 5. Rung 5: on the 6 second, piston 2 retracts. Rung 6: The 2nd light comes on for the 7th second. Rung 7: the 3rd light comes on for the 8th second. Rung 8: the 4th light comes on for the 9th second. Rung 9: The 5th light links on and off until the timer reaches 10 seconds or greater.

Chapter

The End

Lab 10 Data Manipulation


Lab 10 Data Manipulation.pdf - Programmable Logic Controllers

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