User`s manual

Watlow EZ-ZONE™ Communications • 36 • Chapter 3 EtherNet/IP
Figure 3.5 & 3.6
You can now use simple logic to create instructions
to move implicitly the default assembly structures to
and from the PM. Recall that the name given to the
I/O module is also used as the I/O tags. Note in the
first copy instruction (input from PM to PLC) that the
name given to the module appears as the source (Wat-
low_PM). Likewise, in the second copy instruction
(output from PLC to PM) the destination tag reflects
the module name. The two copy instructions below
represent all that’s needed to send and receive data
from the PM. The copy instructions will copy source
tags to destination tags byte for byte, so no further
data conversion is needed.
Figure 3.7
Ladder Logic Example
In the likely event that the user wants to change the default assembly structures, this can be done using
an explicit message. First, it is necessary to define the assembly setup. Note in Tables 3.8 and 3.9 that both
assemblies (O to T and T to O) are accessed via class 119, where the instance identifies input and output with
the attribute identifying the member within the instance.