Reliance electric MD65, Instruction Manual

Page: 48 / 180

6-2
EtherNet/IP Communications Module
6.2 Understanding the I/O Image
The terms input and output are defined from the scanner’s point of
view. Therefore, Output I/O is data that is output from the scanner
and consumed by the EtherNet/IP module. Input I/O is status data
that is produced by the module and consumed as input by the
scanner. The I/O image table will vary based on the following:
•
Configuration of the Operating Mode Switch (SW1) on the
module and parameter 22 (MDI I/O Cfg). The image table always
uses consecutive words starting at word 0.
Figure 6.1 illustrates an example of a Single drive I/O image (16-bit
words).
Single mode is the typical configuration, where one node consists of
a MD65 drive with a MDCOMM-ENET.
For Multi-Drive mode, where one node can consist of up to 5 drives,
refer to chapter 8.
6.3 Using Logic Command/Status
When enabled, the Logic Command/Status word is always word 0
in the I/O image. The Logic Command is a 16-bit word of control
produced by the scanner and consumed by the module. The Logic
Status is a 16-bit word of status produced by the module and
consumed by the scanner.
Figure 6.1 – Single Drive Example of I/O Image
Controller Scanner Adapter
Word and I/O
EtherNet/IP
Output
Image
(Write)
Input
Image
(Read)
Message
Handler
Message
Buffer
0 Logic Status
1 Feedback
Logic Status
Feedback
Message
Handler
0 Logic Command
1 Reference
Logic Command
Reference
MDI
MD65 Drive