EtherNet/IP Communication
‑231‑
Figure 9‑5 Star topology
9.5 Protocol Description
9.5.1 I/O Messages
The MD500‑EN1 expansion card supports 24 I/O messages for data transmission, of
which 12 are master‑to‑slave messages and 12 are slave‑to‑master messages.
The I/O messages enable the master to modify and read AC drive data in real time
and perform periodic data exchange. The data communication addresses are directly
configured by the AC drive. The specific functions are as follows:
● Setting the AC drive control command and target frequency in real time
● Reading the current state and running frequency of the AC drive in real time
● Exchanging function parameter and monitoring parameter data between the AC
drive and EtherNet/IP master in real time
The I/O message data is used for periodic data exchange between the master and
the AC drive, as described in the following table.
I/O Messages (O‑>T) Sent by Master
AC Drive Command
AC Drive Target Frequency
AC Drive Parameters
Modified in Real Time
Output I/O Messages[0] Output I/O Messages[1] Output I/O Messages[2–11]
I/O Messages (T‑>T) Returned by AC Drive
To Next Page
Loading...
