Rockwell Automation 2706-PRIO_PDH485_PDHP_PDNET_PCNET_PENET_PENET1 InView Communication Module User Manual - Manual (Page 76)

Publication 2706-UM017C-EN-P - March 2006
4-26 Application Guide
• Variable Array Size. The size of the array (16 to 80 characters for
DH485) containing the variable data. The maximum array size is
dependent on the controller and must be an even integer.
The address tags are either an Integer (N) or ASCII (A) data file. Both
the Message Trigger and Message Data addresses must fall entirely
within a single 80 byte block, including the Message Data array size.
You can choose to use either an Integer or ASCII data file, but you
cannot use more than one data file. For example, a Message Trigger
address of N7:0 and a Message Data address of N9:0 is not valid. At
the same time, a Message Trigger address of N7:0 and a Message Data
address of N7:35, with a Message Data array size of 16, is not valid
because the array falls outside of the 40 word (80 byte) block.
ControlLogix Controller
DH485 Communication Setup
IMPORTANT
Variable Trigger and Variable Data addresses work
the same as Variable Array Size.