Why Network Resolvers?
Network Resolvers allow the user to install a resolver wherever it is needed to monitor rotary or linear position. Rather than run six wires from the resolver to a resolver decoder (as is done in typical installations) and then run 17 or more wires from the resolver decoder to the PLC, it comes down to two. To connect to a Device-Level Network, one merely "tees off" the network cable and runs a line to the resolver. That's it, installation complete!

Is Network Speed Affected by Adding a Network Resolver? 
One might think so.  But, the answer is usually no. To understand why, it's necessary to understand the differences between a "master" and "slave" as these terms are applied to networking situations.

• In general, a "master" controls all transmission, sequence, and time factors. The master interrogates the network, asking each node in turn whether or not it has anything to report.

• Typically, a "slave" doesn't "talk" on the network until the master requests it to do so.

A detailed examination of the above differences is beyond the scope of this discussion. Suffice to say that, at its simplest level, in a network, both the master and the slave are nodes. When the master calls out the slave's address, the slave does not even look at the bus, it just reports. This works because the master takes full control of time and the operational sequence of the bus. There is no bus traffic EXCEPT when the master initiates it. Priorities and sequencing differ between Network Protocols, but the role of a slave node is to respond to requests from the master node. (Note: The architecture of the bus determines the scan time.)

AVG Automation's line of Network Resolvers are designed to be slaves, not masters. Hence, while they reside on the network, they only occupy and utilize as much time and resources as allocated by the master.

Network Resolvers by AVG
AVG Automation long known as a manufacturer of high-quality, reliable resolvers and resolver-based products has kept pace with the evolution of "open" communication standards and now takes the lead with the introduction of the Network Resolver. Responding to customer requests and examining industry reports has determined that the three most-often­requested open Device-Level Networks are: DeviceNet, ProfiBus, and InterBus. We offer size 40 (4.0" dia.) single-turn and geared single-turn and size 25 (2.5" dia.) versions of single-turn resolvers (for DeviceNet, InterBus and ProfiBus) and a size 40 InterBus multi-turn (dual) resolver.

(For Modbus Plus users, please refer to AVG Automation ModConnect Catalog for our Modbus Plus line of Network Resolvers. A copy can be ordered directly from your participating Schneider AutomationlModicon distributor or from AVG Automation.)

New products are constantly being developed by AVG Automation. Contact your distributor, representative, or AVG Automation for the most up-to-date information about specific features and performance. And, if we don't make what you need, we can!