180 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 4 Input/Output Instructions (MSG, GSV, SSV, IOT)
The following table shows the data types to use with PLC5 Typed Read and
PLC5 Typed Write messages.
The Typed Read and Typed Write commands also work with SLC 5/03
processors (OS303 and above), SLC 5/04 processors (OS402 and above),
and SLC 5/05 processors.
The following diagrams show how the typed and word-range commands differ.
The example uses read commands from a PLC-5 processor to a Logix5000
controller.
Table 4 - Data types for PLC5 Typed Read and Typed Write messages
For this PLC-5 data type Use this Logix5000 data type
BINT
FREAL
NINT
DINT (Only write DINT values to a PLC-5 controller if the value is
≥
−
32,768 and
≤
32,767.)
SINT
ST STRING
16-bit words in PLC-5
processor
32-bit words in Logix5000 controller
The typed commands maintain data structure and value.
1
2
3
4
Typed Read Command
1
2
3
4
16-bit words in PLC-5
processor
32-bit words in Logix5000 controller
The word-range commands fill the destination tag
contiguously. Data structure and value change depending on
the destination data type.
1
2
3
4
Word-range Read Command
1
3
2
4
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