Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 179
Input/Output Instructions (MSG, GSV, SSV, IOT) Chapter 4
Specify PLC-5 Messages
Use the PLC-5 message types to communicate with PLC-5 controllers.
Selecting the CIP Generic message type enables the Large Connection option on the Communication tab.
Use large CIP Generic connections when a message is greater than 480 bytes. (500 bytes is typical, but
note that there are headers at the front of the message.) Large CIP connections can be used for messages
up to 3980 bytes.
The Large Connection checkbox is enabled only when the Connected box is checked and CIP Generic is
selected as the message type on the Configuration tab (see Figure 3 on page 172
).
The Large Connection option is available only in RSLogix 5000 programming software, version 20 or later.
Select this command If you want to
PLC5 Typed Read Read 16-bit integer, floating-point, or string type data and maintain data integrity. See
Data types
for PLC5 Typed Read and Typed Write messages on page 180.
PLC5 Typed Write Write 16-bit integer, floating-point, or string type data and maintain data integrity. See
Data types
for PLC5 Typed Read and Typed Write messages on page 180
PLC5 Word Range Read Read a contiguous range of 16-bit words in PLC-5 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.
PLC5 Word Range Write Write a contiguous range of 16-bit words from Logix5000 memory regardless of data type to PLC-
5 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-5 processor.
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