Rockwell-automation 56RF RFID System User Manual User Manual download pdf (Page 119)

Rockwell Automation Publication 56RF-UM001A-EN-P - October 2011 119

Chapter 12

RFID Tag Speed

The tables below are to be used as a guide to help determine the amount of

information that can be written to/read from an RFID tag based on the speed of

your application. For example, in order to consistently read 8 bytes from a tag

using the square transceiver, your line speed should be 0.827 m/s or slower.

If you have a high speed application, it is best to choose the largest transceiver,

larger tag, which will provide the largest antenna range. This will provide the

longest time the tag is in the field for read/write functions. This will also help

with tag misalignment issues.

If your tag will be stopped when all read/write functions occur, and tag

misalignment is not an issue, smaller transceivers can be used. It is recommended

that the tag be stopped if large amounts of data will be written to/read from the

tag.

Table 18 - Rectangular (80x90) Transceiver

Table 19 - Square (40x40) Transceiver

Max Tag Speed (m/s)

Bytes Read Write

4 1.488095 1.328609

8 1.378676 1.121915

16 1.202887 0.8566533

32 0.9578544 0.5811701

64 0.6802721 0.3535235

112 0.4743833 0.2227833

160 0.3641661 0.1626369

2000 0.03674939 0.01432665

Max Tag Speed (m/s)

Bytes Read Write

4 0.8928571 0.7971656

8 0.8272058 0.6731489

16 0.7217322 0.513992

32 0.5747126 0.348702

64 0.4081633 0.2121141

112 0.28463 0.13367

160 0.2184996 0.09758213

2000 0.02204964 0.008595988

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Rockwell-automation 56RF RFID System User Manual User Manual Page 119