Allen-Bradley SLC 500 Manual page 129

Tag Variable Table
This protocol supports Multi-Drop and RS422/485 Half Duplex.
Some Modicon systems use multiple processors connected together. You can address a slave by adding
an underscore and the slave address to the variable name. For example, OD0001 is read from the
Source ID station address while OD0001_3 is read from slave address 3.
The latest version Modicon Modbus and Modbus Plus drivers support the new variable types DR
(double), LU(long), LS(long signed) and FR(float). This protocol also supports the Sixnet extensions
(Daniel) for those devices designed to utilize the extended variables. A copy of the Modicon tag
variable table is shown below.
Node ID Delimiter: _
Node ID Max: 1-247
Node ID Format: D
Address Format: D
Bit Delimiter for IR and OR: .
Bit Range for IR and OR: 1 to 16
Bit Format for IR and OR: D
NOTE: All output types except DR support "Single write command option".
Device Address Data
Prefix Range Range
Min.
Words
IR 1-65535 0
OR 1-65535 0
OS 1-65535 -32768
ON 1-65535 -32767
MS 1-65535 0
DR 1-65534 0
LU 1-65534 0
LS 1-65534 -99999999
FR 1-65534 -99999999
ILU 1-65534 0
ILS 1-65534 -99999999
IFR 1-65534 -99999999
Bits
OD 1-65535 0
ID 1-65535 0
Sixnet Extensions (Daniel)
DIL 1-65534 -100000000
DOL 1-65534 -100000000
DIF 1-65534 -100000000
DOF 1-65534 -100000000
160 • • • • Modicon
Data Data Data
Range Format Width
Max.
65535 UI 16
65535 UI 16
32767 SI 16
32767 SI 16
65535 TX 16
99999999 ? 32
99999999 LUI 32
99999999 LSI 32
99999999 FLT 32
99999999 LUI 32
99999999 LSI 32
99999999 FLT 32
1 Bit 1
1 Bit 1
100000000 LSI 32
100000000 LSI 32
100000000 FLT 32
100000000 FLT 32
Data Bit write Read
Word (y/n/ / Write
Order rmw)
n/a n/a R
n/a rmw R/W
n/a n/a R/W
n/a n/a R/W
n/a n/a R/W
n/a n/a R/W
ADJ n/a R/W
ADJ n/a R/W
ADJ n/a R/W
ADJ n/a R
ADJ n/a R
ADJ n/a R
n/a Y R/ W
n/a Y R
n/a R
n/a R/W
n/a R
n/a R/W
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