Single-Turn Operation
The DeviceNet Network Resolver is an absolute encoder. That is, it keeps track of the exact shaft position even during a power outage or switching off the machine. At power-up, the Network Resolver will pick up the exact shaft position even if the machine moved during the power outage. In a single-turn operation, the machine cycle is completed during one complete revolution of the transducer shaft.

Field-Selectable CW or CCW Operation
The DeviceNet Network Resolver is factory-wired for ascending counts with CCW shaft rotation. However, the direction of operation can be easily selected in the field by opening up the case and simply reversing the resolver-input plug. No wires need to be unsoldered or soldered.

Ratiometric Resolver-to-Digital Converter
The AVG Automation ratiometric-converter is practically immune to electrical noise, voltage, frequency and temperature variations, and can track speeds up to 5000 RPM.

Housing
The DeviceNet Network Resolver is enclosed in either a size 25--2.5" (63.5 mm) dia. or a size 40--4.0" (101.6 mm) dia. NEMA 13 housing. It is available as a flange mount (size 25), a servo mount (size 25) or a face mount (size 40) model, each with a 5-pin DeviceNet connector at the end.

Variety of Outputs
The DeviceNet Network Resolver is available with Binary, Gray Code, or BCD absolute position output formats.

Power Supply
The DeviceNet network powers the DeviceNet Network Resolver.

Flexible Programming of Counts-Per-Turn
The advanced R-to-D converter used in the DeviceNet Network Resolver has made it possible to program any num­ber of scaled Binary, BCD, or Gray Code counts-per-revolution. The default-encoding format is set to 10-bit Gray Code.

DEVICENET NETWORK BASICS 

DeviceNet is an open network standard. This means that users may specify, install, and use various products from a wide number of suppliers without the need to purchase special equipment, software, or licensing rights. Thus, the user can create a system from a variety of vendors, yet specific to the exact application, mainly using off-the-shelf parts.

DeviceNet is a low-cost communication link that connects industrial devices, such as limit switches, photoelectric sensors, proximity sensors, valve manifolds, motor starters, process sensors, bar code readers, variable frequency drives, panel displays, and operator interfaces to a common network.

Networking devices eliminates the necessity for expensive hard wiring, and the attendant testing and maintenance that goes with it. It also reduces the cost and the time needed to wire and install automation devices, while providing improved communication between devices, as well as important device­level diagnostics, not easily accessible or available through hard-wired I/0 interfaces.

BUS ADDRESSING 

Bus Addressing can be one of the following:

Peer-to-Peer with Multi-Cast (One-to-Many)
Peer-to-peer networks are generally token-pass networks. Each device can send messages only when they have the token. The token gets passed based on node number (round robin) or possibly via user-defined priority list. There is no sense of mastership or priority and it is not deterministic. Multi-Cast allows one-to-many and many-to-one relationships to be built dynamically.

Multi-Master with Multi-Cast
Multi-Master addressing is where more than one unit acts as a master.

Master/Slave Special Case
Polled or change-of-state (exception-based). Rather than a Master going through a polling list (scanning), devices report data (input or output) on a COS (change-of-state) basis as the events occur. This mode is considered more efficient for discrete applications. Network traffic is reduced significantly.