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Input/Output
The Harmony I/O system is powered by redundant 24 VDC
and provides for separate distribution of field power. The I/O
system can be powered by the Modular Power System II.
One or more control enclosures house all I/O system compo-
nents. The block mounting hardware within the enclosure
supports a variety of arrangements. Small cabinet or enclosure
mounting is also supported.
Although not specifically part of the Harmony I/O system,
analog control stations (SAC) can connect and communicate
through CIO blocks as shown in Figure 1-3. Communication is
over an RS-485 serial station link.
Input/Output
The Harmony I/O system supports a variety of input/output
blocks to interface analog, digital, and control I/O. Table 1-1
Figure 1-3. Harmony I/O System
T02056B
I/O H N E T (R E D U N D A N T )
TO RE M O T E
I/O BL O C KS
CIO
HNET
(R ED U ND AN T )
CIO DIO DIO
RLY
SAC
AOT DOTAIN
RMU
WITH HNET
REPEATERS
LEGEND:
AIN = ANALOG INPUT
AOT = ANALOG OUTPUT
CIO = CONTROL INPUT/OUTPUT
DIO = DIGITAL INPUT/OUTPUT
DOT = DIGITAL OUTPUT
HNET = HARMONY COMMUNICATIONS NETWORK
RLY = RELAY ASSEMBLY
RMU = REPEATER MOUNTING UNIT
SAC = ANALOG CONTROL STATION
HARMONY
CONTROLLER
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