I/O Connection Status

Type:	Communications Register
RMC75 Address:	%MD21.23
RMC150 Address:	%MD45.23
RMC200 Address:	EtherNet/IP Connection #1: %MD112.0 EtherNet/IP Connection #2: %MD112.4 EtherNet/IP Connection #3: %MD112.8 PROFINET I/O Connection: %MD112.12
System Tag:	See table below
How to Find:	Address Selection Tool → Controller → Communication Settings → Ethernet
Data Type:	DWORD
Accessibility:	Read Only

These registers indicate the state of the EtherNet/IP and PROFINET I/O communications. For more details, see Handling Broken EtherNet/IP I/O Connections and Handling Broken PROFINET Connections.

For the RMC75 and RMC150, there is a single I/O Connection Status register shared by EtherNet/IP and PROFINET. If there is an EtherNet/IP Exclusive Owner I/O connection open, this register will reflect the state of that connection. If there is a PROFINET I/O connection open, then this register will reflect the state of that connection.

For the RMC200, there is one I/O Connection Status register dedicated to each EtherNet/IP and PROFINET I/O connection.

The bits within each register are defined as follows for the respective connection:

Bit

RMC75/150 Tag Name

RMC200 Tag Name

Description

_Enet.CCStatus.Active

_Enet.IOConn1Status.Active

_Enet.IOConn2Status.Active

_Enet.IOConn3Status.Active

_Enet.PNIOConnStatus.Active

I/O Connection Active
This bit is set as long as an I/O connection is currently active. If the connection is closed or timed out, this bit will be cleared.

_Enet.CCStatus.TimedOut

_Enet.IOConn1Status.TimedOut

_Enet.IOConn2Status.TimedOut

_Enet.IOConn3Status.TimedOut

_Enet.PNIOConnStatus.TimedOut

I/O Connection Timed Out

This bit is set when an I/O connection timed out. Notice that this is only one method of a connection being closed (another example is the PLC intentionally closing it). This bit is cleared when the I/O connection is re-opened. The user can look for the rising edge of this bit in the Program Triggers to respond to a time-out.

A time-out can occur when the cable is disconnected, or when the client is powered off or reset.

This bit is not used for PROFINET on the RMC75/150.