IMC CANSAS - Special Module-Specific Characteristics; Acquisition Modules; ISO8, C8, INC4 and C12

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136 Virtual Channels

4.7 Special module-specific characteristics

4.7.1 Acquisition modules

Depending on the module type, acquisition modules process either analog or digital input data. The

isolation and bridge amplifier modules, for example, take analog input data, and the digital acquisition

module DI16 takes digital data. The imc CANSAS module then sends the incoming data to the CAN-bus,

either directly or after prior processing. Such prior processing is accomplished with the help of virtual

channels; for instance, such a channel can contain the results of low-pass filtering applied to physical

input data. After data processing, only the results are then transmitted by CAN-bus.

The raw data always consist of the physical or digital input signals, which can then be subjected to any

desired processing. All channels assigned to a message are then transmitted by CAN-bus.

In order for data to be ready for transmission via CAN-bus, the bits or bytes to be transmitted must be

assigned to specific channels. To do this, use the Drag & Drop technique to position the Module Tree

entries of channels in messages. Virtual channels as well as physical inputs can be positioned in the

messages. In the message mapping dialog, a message's bit and Byte assignments, the number and order

of bits, the numerical format of the channel data being transmitted and the scaling factor and offset are

all indicated.

4.7.1.1 ISO8, C8, INC4 and C12

Isolation module ISO8, differential amplifier modules C8 and C12 and

incremental encoder module INC4

Up to 12 physical inputs are available depending on module type.

Sample application: A low-pass filter is to be applied to a physical input channel's signal and the results

are to be transmitted by CAN-bus. To do this, a virtual channel must be created and positioned in a CAN-

message (via Drag & Drop). In the settings dialog for this virtual channel, a low-pass filter function can be

selected and its parameters set.

Other manuals for IMC CANSAS