Allen-Bradley SLC 500 Manual page 247

Tag Variables
Valid tag variable names and address ranges are shown in the Interbus-S DP 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.
Example 3, Byte Addressing: Input Words = 64, Output Words = 64, Input start address = 0, Output
start address = 0.
Name
I (Input Bit)
Q (Output Bit)
IB (Input Byte)
QB (Output Byte)
IW (Input Word)
QW (Output Word)
ID (2 Word Input)
QD (2 Word Output)
DWORD BYTE
ID0 IB0
IB1
ID1
IB2
ID2
IB3
IB4
IB5
ID124
IB124
IB125
IB126
IB127
QUICKDESIGNER
Address range Value range
I0.0 to I127.7 0 to 1
Q0.0 to Q127.7 0 to 1
IB0 to IB127 0 to 255
QB0 to QB127 0 to 255
IW0 to IW126 -32768 to 32767
QW0 to QW126 -32768 to 32767
ID0 to ID124 -999999999 to
999999999 Y
QD0 to QD124 -999999999 to
999999999 N
WORD DWORD
IW0 QD0
IW1
QD1
IW2
QD2
QD124
IW126
Write Type
Y Bit
N Bit
Y Byte
N Byte
Y Word
N Word
DWord
Dword
BYTE WORD
QB0 QW0
QB1 QW1
QW2
QB2
QB3
QB4
QB5
QB124
QB125
QB126
QW126
QB127
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