1 . M P U U n i ts
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1-43
ignores the presence of analog modules. Analog modules are addressed in the TO and FROM
instructions by the location of each analog module with respect to their proximity to the controller. In
other words, the first analog I/O module encountered to the right of the controller is addressed as 0.
The next analog I/O module to the right of the controller and to the right of the first analog I/O
module is address 1 and so on up to address 7. A maximum of eight analog I/O extension units can
be connected to one controller (addresses 0-7).
Example:
Extension unit
ELC Model
Input
points
Output
points
Input
numbering
Output
numbering
First extension
ELC-EX08NNDN
8
0
X20~X27
-
Second extension
ELC-AN06AANN
-
-
-
-
Third extension
ELC-EX16NNDR
8
8
X30~X37
Y20~Y27
Fourth extension
ELC-AN04ANNN
-
-
-
-
Fifth extension
ELC-EX08NNDR
4
4
X40~X43
Y30~Y33
Note:
The second extension module (ELC-AN06AANN) will be addressed as 0, and the fourth extension
module (ELC-AN04ANNN) will be addressed as 1. Please refer to API 78(FROM), 79(TO) for more
detailed information concerning reading and writing to analog I/O modules.
