Specify PLC-3 Messages
The PLC-3 message types are designed for PLC-3 processors.
Select this command: | To: |
|---|---|
PLC3 Typed Read | Read integer or REAL type data. For integers, this command reads 16-bit integers from the PLC-3 processor and stores them in SINT, INT, or DINT data arrays in the Logix 5000 controller and maintains data integrity.This command also reads floating-point data from the PLC-3 and stores it in a REAL data type tag in the Logix 5000 controller. |
PLC3 Typed Write | Write integer or REAL type data. This command writes SINT or INT data, to the PLC-3 integer file and maintains data integrity. You can write DINT data as long as it fits within an INT data type (−32,768 ≥ data ≤ 32,767). This command also writes REAL type data from the Logix 5000 controller to a PLC-3 floating-point file. |
PLC3 Word Range Read | Read a contiguous range of 16-bit words in PLC-3 memory regardless of data type. This command starts at the address specified as the Source Element and reads sequentially the number of 16-bit words requested. The data from the Source Element is stored, starting at the address specified as the Destination Tag. |
PLC3 Word Range Write | Write a contiguous range of 16-bit words from Logix 5000 memory regardless of data type to PLC-3 memory.This command starts at the address specified as the Source Tag and reads sequentially the number of 16-bit words requested. The data from the Source Tag is stored, starting at the address specified as the Destination Element in the PLC-3 processor. |
The following diagrams show how the typed and word-range commands differ. The example uses read commands from a PLC-3 processor to a
Logix 5000
controller.
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