Product Details Supplier Info More products

The Devicenet scanner module allows easy communication between various devices on an industrial network, including LED displays, PLCs and HMI.

Explicit messaging support allows editing device parameters from within a PLC program.

Cyclic data support allows the user to define data refresh rates, which is ideal for manufacturing applications.

Change-of-state data support is ideal for high-speed applications, where throughput and node prioritisation is key.

With change-of-state operation, there is no output of information from an actuator/sensor unless something has changed.

This frees the network from ‘housekeeping’ duties.

Devicenet bus addressing can be conducted in several different modes: in peer-to-peer with multi-cast, peer-to-peer networks are generally token-pass networks.

Each device can send messages only when it has the token.

The token is passed based on the node number (round robin) or possibly via a user-defined priority list.

There is no sense of mastership or priority and it is not deterministic.

The multi-cast feature allows one-to-many and many-to-one relationships to be built dynamically.

In multi-master with multi-cast, more than one unit acts as a master.

Master/slave is a special case: this is ‘polled’ or ‘change of state’ (exception based).

Rather than a master going through a polling list (scanning), Devicenet sensors/actuators report data (input or output) on a change-of-state (COS) basis as the events occur.

This method is considered more efficient for discrete applications.

The Devicenet scanner communicates with the Modicon TSX Quantum PLC processor via discrete and block transfers over the backplane.

A Devicenet product may behave as a client, server, or both.

The scanner communicates with the scanned devices via strobe, polled, change of state and cyclic messages.

It uses these messages to solicit data from or deliver data to each device on the network.

Data received from the devices, or input data, is organised by the scanner and made available to the PLC processor.

Data received from the PLC processor, or output data, is organised in the scanner and sent on to the network devices.

The Devicenet scanner allows connection of a wide variety of 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 from over 150 manufacturers world-wide, directly to your Modicon TSX Quantum PLC.

Each component on the Devicenet has its own address that cannot be used by any other on the network.

All communications occur on a single Devicenet cable.

Instead of discrete wiring from the PLC to each sensor or actuator in an application, with Devicenet, adding or removing a component is simple.

The user ‘tees off’ from the cable wherever installation of a sensor or actuator is needed, drops a line, and it is ready for operation.

This all adds up to reduced wiring costs and quicker installation.

Balmoral Technologies

View full profile