Rockwell Automation 7000 DPI Wireless Interface Module - Manual (Page 81)

Glossary
A
Application Code
Code that runs in the WIM after the boot code calls it. It performs the
normal operations of the system.
B
BCC (Block Check Character)
An error detection scheme where the 2’s complement of the 8-bit sum
(modulo-256 arithmetic sum) of all data bytes in a transmission block. It
provides a means of checking the accuracy of each message
transmission.
Bluetooth Wireless Technology
Bluetooth wireless technology enables cable-free connection of devices
that would normally be physically linked by wires, such as a drive
connected to a computer.
Boot Code
Code that runs when the WIM first receives power. It checks basic
operations and then calls the application code.
Bus Off
A bus off condition occurs when an abnormal rate of errors is detected on
the Control Area Network (CAN) bus in a device. The bus-off device
cannot receive or transmit messages. This condition is often caused by
corruption of the network data signals due to noise or data rate mismatch.
C
CAN (Controller Area Network)
A CAN is a serial bus protocol on which DPI is based.
ControlFLASH
ControlFLASH is an Allen-Bradley software tool that lets users
electronically update firmware on printed circuit boards. The tool takes
advantage of the growing use of flash memory (electronic erasable
chips) across industrial control products.
CRC (Cyclic Redundancy Check)
An error detection scheme where all of the characters in a message are
treated as a string of bits representing a binary number. This number is
divided by a predetermined binary number (a polynomial) and the
remainder is appended to the message as a CRC character. A similar
operation occurs at the receiving end to prove transmission integrity.