User guide

Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013 107
Communication Chapter 8
Default Input/Output
Configuration
The default configuration for I/O is 4 bytes in and 4 bytes out (TX = 4 bytes,
RX = 4 bytes) and is arranged according to the following table.
Table 13 - Default Input/Output Configuration
Variable Input/Output
Configuration
The SMC Flex supports 16-bit DataLinks. Therefore, the device can be
configured to return additional information. The I/O message size depends on
how many DataLinks are enabled. The following table summarizes the I/O data
sizes.
Table 14 - Variable Input/Output Configuration
To c o n f i g ur e D a t a L i n k s , r e f e r t o Configuring DataLinks on page 110.
Produced Data (Status) Consumed Data (Control)
Word 0 Logic Status Logic Command
Word 1 Feedback
(1)
(1) The feedback word is always Current in Phase A.
Reference
(2)
(2) The reference word is not used with the SMC Flex, however the space must be reserved.
Rx Size
(Byte)
Tx Size
(Byte)
Logic Status/
Command
(16-bit)
Reference/
Feedback
(16-bit)
Data Links
ABCD
44XX
88XXX
12 12 X X X X
16 16 X X X X X
20 20 X X XXXX