Chapter 9—C445 Logic Engine and Expansion I/O
198
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
www.eaton.com
Addressing Digital Inputs
The digital input modules are addressed based on their
position to the right of the communication adapter. The
inputs for the first digital input module to the right of the
adapter will always be X0–X7. If it is a module with 4 inputs
the inputs will be addressed X0–X3. X4–X7 will simply be
unused (this applies to all subsequent input modules as well).
The next digital input module will be addressed as X10–X17,
then X20–X27 through X70–X77 for the eighth digital input
module. Note that the addresses are using the octal number
system. Even if there are digital output and/or analog I/O
cards between the first digital input card and the adapter, the
input addresses for the digital input cards will be the same.
Addressing Digital Outputs
The digital output modules are addressed based on their
position to the right of the communication adapter just as the
digital inputs. The outputs for the first digital output module
to the right of the adapter will always be Y0–Y7. If it is a
module with 4 outputs the outputs will be addressed Y0-Y3.
Y4–Y7 will simply be unused (this applies to all subsequent
output modules as well). The next digital output module will
be addressed as Y10-Y17, then Y20-Y27 through Y70-Y77 for
the eighth output module. Note that the addresses are using
the octal number system. Even if there are digital input and/
or analog I/O cards between the first digital output card and
the adapter, the output addresses for the digital output cards
will be the same.
Addressing Combination Digital I/O cards
Combo digital I/O cards will have either 4 inputs and 4
outputs or 8 inputs and 8 outputs. The same addressing rules
apply as described above. The combo cards are treated the
same as far as addressing is concerned as if they were
separate cards. For example, if an ELC-EX16NNDR 8 input
and 8 output digital I/O card is the first digital card to the right
of the adapter, the inputs are addressed as X0-X7 and the
outputs as Y0-Y7.
A maximum of 16 I/O modules can be added to the
ELC-CARS485 adapter. Any combination of 16 digital and
analog modules, including thermocouple and RTD input
modules can be added and accessed by the Logic Engine
with a maximum of 8 analog modules. Below is how the
digital I/O is addressed, assuming 16 digital modules are
used, with 8 inputs and 8 outputs per module. Octal
addressing is used due to the ease of using this number
system when each card has 8 inputs and/or 8 outputs.
Even for combination digital I/O cards that have 4 inputs and
4 outputs a full byte for the 4 bits of input and output data is
allocated. In that case, only the low 4 bits of the input and
output data is utilized. X represents inputs and Y outputs.
The addressing for the digital cards, whether separate or
combo cards are as follows:
Module 1: X0-X7, Y0-Y7
Module 2: X10-X17, Y10-Y17
Module 3: X20-X27, Y20-Y27
Module 4: X30-X37, Y30-Y37
Module 5: X40-X47, Y40-Y47
Module 6: X50-X57, Y50-Y57
Module 7: X60-X67, Y60-Y67
Module 8: X70-X77, Y70-Y77
Module 9: X100-X107, Y100-Y107
Module 10: X110-X117, Y110-Y117
Module 11: X120-X127, Y120-Y127
Module 12: X130-X137, Y130-Y137
Module 13: X140-X147, Y140-Y147
Module 14: X150-X157, Y150-Y157
Module 15: X160-X167, Y160-Y167
Module 16: X170-X177, Y170-Y177
Addressing Analog I/O
Analog I/O modules will provide I/O addresses based on
whether they are analog/temperature input modules, analog
output modules or the analog I/O combination module.
Again, a maximum of 8 analog modules are allowed.
Note, the Expansion I/O configurator software will display
the proper I/O addresses for each module when it is
selected. These addresses will then also be populated in the
Logic Engine under VariableList/RIOParam.
If, for example, 3 digital modules are used, but an analog
module is between the second digital module and the third
digital module, the addressing used for the digital I/O on the
3 cards is the same as if the analog module was not present.
Analog I/O addresses contain an I for input or a Q for output
along with a number associated with its position relative to
other analog modules. In other words, the first occurrence
of an analog module to the right of the CARS-485 module is
1. If 8 analog modules are used, they will be 1-8. For analog
inputs, there are 2 values for each input. One is an average
value of 10 samples and the other is an instantaneous value.
The average value will be a much smoother value, but the
instantaneous value will show a change in the signal faster.
The average value of 10 is configurable.
