Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 181
Input/Output Instructions (MSG, GSV, SSV, IOT) Chapter 4
Specify SLC Messages
Use the SLC message types to communicate with SLC and MicroLogix
controllers. The following table shows which data types that the instruction lets
you access. The table also shows the corresponding Logix5000 data type.
Specify Block-transfer Messages
The block-transfer message types are used to communicate with block-transfer
modules over a Universal Remote I/O network.
To configure a block-transfer message, follow these guidelines:
·The source (for BTW) and destination (for BTR) tags must be large
enough to accept the requested data, except for MESSAGE, AXIS, and
MODULE structures.
·Specify how many 16-bit integers (INT) to send or receive. You can
specify from 0…64 integers.
For this SLC or MicroLogix data type Use this Logix5000 data type
FREAL
L (MicroLogix 1200 and 1500 controllers) DINT
NINT
If you want to Select this command
Read data from a block-transfer module
This message type replaces the BTR instruction
Block-Transfer Read
Write data to a block-transfer module
This message type replaces the BTW instruction
Block-Transfer Write
If you want the Then specify
Block-transfer module to determine how many 16-bit
integers to send (BTR)
0 for the number of elements
Controller to send 64 integers (BTW)
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