IMC CANSAS - Notes on DO8 R and DO16 R; Taking Measurements with the Digital Output Modules

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208 Measurement Technique

5.1.5.4 Notes on DO8R and DO16R

The board with the signal processor (DSP) is at internal ground potential GND. This is the module's

internal "digital ground", and is connected to the chassis as well as to the shielding of the input plug. This

internal electric potential must not "float" in relationship to the power supply or the CAN-bus. Rather,

the maximum voltage differential of 50 V to GND must not be exceeded, so GND must be held at a

suitable value. Otherwise, the module can sustain damage or malfunction. A chassis connection is

provided in the form of the shielding terminal.

It is generally recommended to connect the housing (chassis) to ground (protective grounding line). The

housing mainly consists of conduction material.

5.1.5.5 Taking measurements with the digital output modules

In the dialog Measure, the digital output bits of a DO16R or DO8R module are listed only if they are

assigned to a CAN-message. In such cases, the entry for the Measurement/ output value represents the

signal's output value. Upon the start of the measurement, the Power-up value is displayed. The output

signal can be influenced by editing the values in the column Measurement/ output value. Double-clicking

in these cells, the editing mode is activated, and the value for the digital bits can be toggled between 0

and 1. When the ENTER-key is then pressed, the value is checked, accepted and sent to the module.

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