Rfid Tags

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RFID tags can hold more data than bar codes. The operative word here is "can". As the data storage capacity of RFID tags increase, so does the cost of the tags. Therefore, you will likely find that many RFID tags will not hold any more data than a bar code.

RFID tag data can be changed or added to as a tag passes through specific operations. Once again, cost comes into play here, as read-only tags are much less expensive than read/write tags. Therefore, you will likely see limited use of this functionality.

RFID tags are more effective in harsh environments where bar code labels have problems. RFID tags can be sealed within a plastic enclosure eliminating many of the problems that plague bar codes in harsh environments where they are exposed to chemicals, heat, abrasion, dirt and grease buildup, etc.

A large number of RFID tags can be read almost instantaneously. This brings us back to the palletized load scenario where the load contains a large quantity of products, each with its own RFID tag. Though it may seem as though the tags are all read at once, they are actually read sequentially (one at a time), however, this happens so fast that it is virtually imperceptible.

Disadvantages.

Cost, Cost, Cost. This is the biggest hurdle to RFID tags replacing bar codes for item-level tracking of low-cost products. You can produce a bar code on an item for less than 1 cent, yet the most optimistic proponents of RFID are still "hoping" for 5 or 10-cent RFID tags sometime in the future (this may be years away). And even if we get 5-cent tags, that is still a significant cost to add to the manufactured cost of low-cost consumer goods. And even with higher-cost products, or case and pallet level tracking, the benefits of RFID must be greater than this additional cost.