Chapter 12 Flashcards
What does AIDC stand for?
Automatic identification and Data Capture-technologies that provide direct entry of data into a computer or other microprocessor-controlled system without using a keyboard. Many require no human involvement
4 Applications of AIDC in manufacturing
- Monitoring status
- WIP
- machine utilization
- worker attendence
Applications of AIDC in material handling
- Shipping and rec
- storage
- sortation
- order picking
- kitting of parts for assembly
Drawbacks of manual data handling
- More Errors
- More time
- More labor cost
All AIDC consist of three principal components which also comprise the sequential steps in AIDC
- Data Encoder-characters are translated into machine-readable code
- Machine reader or scanner-device that reads encoded data, and converts it usually into electric analog signal
- Data Decoder-component transforms electrical signal into digital data and back to alphanumeric charcyters
6 categories of AIDC technologies
- Optical
- Electromagnetic
- Magnetic
- Smart Cart
- Touch techniques
- Biometric
Common applications of AIDC technologies
- Receiving
- Shipping
- Order Picking
- Finished goods storage
- Manufacturing processing
- WIP storage
- Assembly
- sortation
Reasons for using AIDC
- Data accuracy
- timeliness
- labor reduction
2 parameters to measure AIDC errors
- First Read Rate FRR-probability of successfully reading data first time
- Substitution error rate-SER-frequency with which scanner incorrectly reads encoded char as some other char.
2 bar code types
- Linear-linear sweep of scanner.2 forms are width and height modulated
- Two dimensional-encoded data must be read in both directions
2 types of linear bar code tech
- Width modulated
- Height modulated-not used that much
Width modulated are like morse bar code
UPC
Universal Product code
The bar code standard adopted by car makers, DOD, and other manufacturing services
Code 39
also known as AIM USD-2
Why is it 39? It’s because there are 9 elements(bars and spaces) and 3 elements are wide
How are bar code readers classified?
- Contact
2. Noncontact
Advantages of 2-d symbol schemes
- Store much greater amounts of data
2. Higher densities
2-d symbologies divide into two basic types
- Stacked bar codes-can hold greater data
2. Matrix symbologies
Problems with stacked bar codes
- Keeping track of the different rows during scanning
- dealing with scanning swaths that cross between rows
- Detecting and correcting localized errors
what does RFID stand for
Radio Frequency Identification technology
Its replacing bar codes
How does RFID work
a tag or label of data is attached to item. There is an IC ship and a small antennae
Communication is done through a 2 way transponder
2 types-active and passive
Principal applications of RFID
- inventory management
- supply chain management
- Tracking systems
- Warehouse control
- location ID
- WIP tracking
Advantages of RFID
- ID does not depend on physical contact
- more data can be contained
- data can be altered for reuse of tag
disadvantages is that its more expensive
what does OCR stand for
Optical character recognition-special designed alpha numeric that are machine readable by an optical reading device
What are main applications of machine vision
- automated inspection tasks
- read 2-d matrix symbols
- used for stacked bar codes
Why are magnetic strips not widely used
- needs near-contact scanning
- lower scanning rates
- Higher error rates
Relative advantages of bar codes over RFID
1.Low cost
advantages of RFID over barcode
- Reusable
- Read-Write
- More durable
- More data contained
- ID does not depend on physical contact
