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Power Supply Options and Considerations
Power Supply Options and Considerations
The IO-R-34 is a 24Vac or dc powered device compatible with EC-BOS-8 input power requirements. Use a
dedicated transformer to supply 21.6 to 26.4Vac/dc power to the module. Only the EC-BOS-8 and IO-R-34 modules
should be powered from the same transformer. Wire the input voltage to the module's 2-pin 24Vac/dc power
connector, located on the lower right corner of the unit.
Table 1
shows possible combinations. For example, Option 2 includes a total of 14 IO-R-16s and one 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 controller, you should allow for voltage
Note
drops introduced by cabling distances.
Operation without power backup
If an IO-R-34 module is powered locally and a momentary AC power loss occurs, note that a number of undesirable
things can result, including:
Load cycling from module 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.
•
2
Number of Devices Powered by IO-R-34(s) Powered by External Supply
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
Remote IO-R-34 Module Mounting and Wiring Guide
August 2, 2017
System Planning
16
10
4
0
0
0
0
0
0