SM-DeviceNet

2.2

Table 2.2 details the number of data words used to communicate the signals using the

DeviceNet network. It can be seen that the resulting reduction in cabling is significant.

DeviceNet can transfer data using two distinct modes. The first of these modes is cyclic where signals are sent in predefined blocks at regular intervals. This is the equivalent of the hard-wired example above in Figure 2-1.

The second method of transfer is called non-cyclic data and is used for sending values that only need to be changed occasionally or where the source or destination of the signal changes; this is the equivalent of a temporary patch lead that is removed after use.

What is SM-DeviceNet?

SM-DeviceNet is a fieldbus Solutions Module that can be installed to the expansion slot(s) in any of the following drives to provide DeviceNet slave connectivity:

•

•

•

•

Unidrive SP

Commander SK

Digitax ST

Mentor MP

In the case of Unidrive SP, Digitax ST or Mentor MP, it is possible to use more than one

SM-DeviceNet or a combination of SM-DeviceNet and other Solutions Modules to provide additional functionality such as extended I/O, gateway functionality, or additional

PLC features.

Figure 2-3 SM-DeviceNet Solutions Module

SM-DeviceNet User Guide

Issue Number: 7 www.controltechniques.com

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