I downloaded the manual for the Ethernet interface modules, models QJ71E71-100, QJ71E71-B5 and QJ71E71-B2. The Fixed Buffer Communication is probably offers the best option for a solution.
billwest
Bill West
Consulting Sales Application Engineer
Siemens Industry, Inc.
Industry Automation
Industrial Automation Systems
1900 Musket Court
Stone Mountain, GA 30087
Work: 770-310-5965