Design-In - Electrical Aspects
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COMX Communication Modules | Design Guide
DOC100901DG18EN | Revision 18 | English | 2013-12 | Released | Public
© Hilscher, 2002-2013
3.3 LEDs
To get a fast overview about the status of the module and the Communication two duo color LEDs
are placed on the module respectively can be connected.
SYS defines the general status of the communication module, means starting 2
nd
stage bootloader,
or firmware. On the module we are using the colors yellow for boot and green for firmware loaded.
2nd Status LED shows communication errors or status and communication activities. If there is no
definition in the fieldbus standard we use red for error and green for status. If there is a definition
we use these for the functions and colors of that LED. For the modules described in that revision of
the manual it is only for DeviceNet the case.
The outputs can drive max. 4 mA. If this is too less an external driver should be placed before the
LEDs.
The following schematic shows how to connect the LEDs.
In some cases the brightness of the LEDs of the duo color LEDs are so different that it makes
sense to use different resistors to make it equal. This is shown as an example for the LED COM.
The following figure shows the example how to connect the LED for COMX 100CN-CO, COMX
100CN-DN, COMX 100CN-DP. This is the new design for all COMX modules which is compatible
to the COM-CN modules.
Figure 14: Example how to connect the LEDs COMX CN Fieldbus