Emerson Rev AA User Manual

00809-0200-4708, Rev AA

January 2014

Smart Wireless Gateway for SteamLogic OPC Server

OPC Item's Timestamp is read from SteamLogic's State Change Timestamp.

The above Trap Status, Monitor Status, and State Change Timestamp icons and values are based 
on the SteamLogic version 1.1.0 and SteamLogic Database version 5.

The OPC TrapState item's data type is byte “VT_I1” in an OPC client.

This section describes the network architecture used to establish OPC communications 
between the SteamLogic software and the host system. This communication path will allow the 
calculated trap state, a timestamp, and quality to be monitored by an OPC client. All other 
parameters, including PV, SV, TV, and QV, are available through the Gateway protocol interfaces 
(Modbus, OPC, Ethernet/IP, HART-IP).

The following network architecture diagrams will help when integrating data from SteamLogic 
into the host system.

An OPC server (proxy) is provided by Rosemount as part of the SteamLogic software installation 
package. The Host System will need OPC client capabilities that are used to establish 
communications with the SteamLogic OPC Server.

As shown in the architecture drawing the Gateway transmits the device data via the HART-IP 
protocol to the SteamLogic polling service. The steam trap status is then calculated within the 
SteamLogic polling service and stored in the SteamLogic database. Using the SteamLogic OPC 
server the trap state can be accessed via the OPC client within the host system.