Hardware Description
Chapter 3.
3.6.3 Multiple 8DI-4AI-2DO Extension Cards
The boot process of the Base Unit includes an automated detection of the inserted Extension
Cards. This detection is done sequentially, slot per slot starting from the left to right.
The Extension Cards of type FLX 3401 can be inserted in all slots. The eWON Flexy firmware
supports up to 4 Extension Cards of this type.
3.6.4 Basic Principles of the eWON Flexy I/O Tag Addresses
The internal tag addressing of the Flexy range always starts with the Inputs/Outputs of the Base
Units. Remember that all Base Units feature 1 Digital Output and 2 Digital Inputs, those are the
first ones that have to be considered when creating tags in the eWON.
The example below helps you to understand the syntax of the I/O Server tag addresses in the
case of 2 I/O Extension Cards.
Note
:
Following the left-to-right order of slots, the first card to be detected is Extension Card
plugged in the most left slot, then the next on its right and so on. Removing an I/O card other than
the utmost right one will result in an internal reallocation of tag addresses that may result in a
mismatch between physical I/Os and their software configuration. The software tag addresses
can be “frozen” by adding the slot number in the tag definition. This prevents accidental I/O
mismatch (see next page).
eWON Flexy - 8DI-4AI-2DO Extension Card - FLX 3401 (Installation Guide)
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