Inputs and Outputs
WBPEEUI240751C0 3 - 5
An I/O block that supports digital inputs reads voltage levels
at its input channels, converts the voltages to boolean logic
states (0 or 1), then reports the input states to the Harmony
controller. The block provides channel status information
along with each reported input.
Digital Output
Digital output channels can be used to drive annunciators
such as buzzers and lamps and to drive two-state final control
elements such as actuators, relays, and solenoids (Fig. 3-4).
The following digital output voltages are supported:
• 24, 48, and 125 VDC.
• 120 and 240 VAC.
The system can support current loads up to 10 amperes with
auxiliary relay assemblies used with DIO blocks.
Figure 3-4. Digital Output
OPEN
COLLECTOR
OUTPUTS
ELECTRO-
MECHANICAL
RELAY OUTPUT
EXTERNAL FIELD
POW ERED
C
NO
NC
INT ER N AL F IE L D
POW ERED
+
–
LOAD
LOAD
LOAD
EXTERNAL FIELD
POW ERED
+
–
LOAD
V
SOURCE
V
SOURCE
COMMON
COMMON
COMMON
T00557A
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