Allen-Bradley SLC 500

QUICKDESIGNER CANopen •
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• 79
Tag Variables
Valid tag variable names and address ranges are shown in the CANopen Protocol dialog box when you
configure the protocol.
The number of Input and Output words and the addressing will determine the valid address range limits
for each variable type. The variable type names are fixed and are displayed in a cell corresponding to
the addressing type.
Byte Addressing
Byte Addressing: Input Words = 127, Output Words = 127, Input start address = 0, Output start
address = 0.
Name Address range Value range Write Type
I (Input Bit) I0.0 to I253.7 0 to 1 Y Bit
Q (Output Bit) Q0.0 to Q253.7 0 to 1 N Bit
IB (Input Byte) IB0 to IB253 0 to 255 Y Byte
QB (Output Byte) QB0 to QB253 0 to 255 N Byte
IW (Input Word) IW0 to IW252 -32768 to 32767 Y Word
QW (Output Word) QW0 to QW252 -32768 to 32767 N Word
ID (2 Word Input) ID0 to ID250 -999999999 to
999999999 Y DWord
QD (2 Word Output) QD0 to QD250 -999999999 to
999999999 N Dword
Byte Addressing Layout
IB0
IB1
IB2
IB3
IB4
IB5
IB250
IB251
IB252
IB253
IW0
IW1
IW2
ID0
ID1
ID2
IW252
ID250
BYTE WORDDWORD
QB0
QB1
QB2
QB3
QB4
QB5
QB250
QB251
QB252
QB253
QW0
QW1
QW2
QD0
QD1
QD2
QW252
QD250
BYTE WORDDWORD