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Power Supply Options and Considerations
Table 1
shows possible combinations. For example, Option 2 includes a total of 14, IO-R-16s and 1, IO-R-34. Four
of the IO-R-16s are powered by the IO-R-34. The remaining 10 IO-R-16s must be powered by an external source.
Table 1
IO Module Combinations and IO-R-16 Power Options
Combinations
Module
Option 1
Option 2
Option 3
Option 4
Option 5
Option 6
Option 7
Option 8
Option 9
Both IO-R-16 and IO-R-34 should have a UPS power backup if continuous operation during power failures is a
requirement. These modules do not support the battery powered configurations provided on some legacy hardware.
The 5 pin power/comm connectors do not include a battery pin, preventing connection to (and possible damage
from) legacy controllers.
When cabling power to modules located some distance from the EC-BOS-8, you should allow for voltage
Note
drops introduced by cabling distances. See
Operation without power backup
If an IO-R-16 module is powered locally, with an IO-R-34, for example, and a momentary AC power loss occurs,
note that a number of undesirable things can result, including:
Load cycling from IO-R-16 relays dropping out, including several seconds lag to first re-establish
•
communications with the EC-BOS (Nrio driver) before relays can pull in again, as needed.
Totalized "counts" zeroed out.
•
History (logging) entries for associated IO points as "down," as well as Nrio "device down" alarms.
•
Further, loss of power without backup makes an IO firmware upgrade a risky operation. Such an upgrade is initiated
from the "Nrio Device Manager" view (in a station connection to the EC-BOS). If this upgrade process is interrupted
by a IO-R-16 power cycle, the module may be rendered inoperable—and will likely need to be replaced. Therefore,
consider providing UPS backup power.
Configure default settings for comm loss scenarios—
DO values to be set in case of a power outage or other communications-loss situations. The feature is configurable
for timing and function. You can choose to use it on Powerup, CommLoss, both or neither. See the Nrio Driver Guide
for details.
2
Number of Devices Powered by IO-R-34(s)
IO-R-16
16
IO-R-34
0
IO-R-16
14
IO-R-34
1
IO-R-16
12
IO-R-34
2
IO-R-16
10
IO-R-34
3
IO-R-16
8
IO-R-34
4
IO-R-16
6
IO-R-34
5
IO-R-16
4
IO-R-34
6
IO-R-16
2
IO-R-34
7
IO-R-16
0
IO-R-34
8
0
4
8
10
8
6
4
2
0
"Voltage drop considerations"
You can use EC-Net Pro to configure default AO and
Remote IO-R-16 Module Mounting and Wiring Guide
August 2, 2017
System Planning
Powered by External Supply
16
10
4
0
0
0
0
0
0
on page 3.
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