WBPEEUI240751C0 3 - 1
Section 3
Description and Operation
Introduction
This section describes the following capabilities and compo-
nents of the Harmony I/O system:
• Inputs and outputs.
• I/O blocks.
• Auxiliary blocks.
• I/O system configuration.
Inputs and Outputs
The Harmony I/O system supports a variety of input and out-
put types, both analog and digital. Analog signals, for example,
include pressure and flow transmitter signals, and thermocou-
ple (TC) and RTD temperature inputs. Digital signals are
two-state signals that have discrete on and off voltage levels
such as relay contacts, switches, and solenoids. Inputs and
outputs can be either internally I/O system powered or exter-
nally powered.
Analog Input
The following analog inputs are supported (Fig. 3-1):
• 4 to 20 milliampere high level.
• –10 to +10 VDC high level.
• –100 to +100 millivolt (DC) low level.
• Thermocouple:
B, E, J, K, L, N (14 AWG), N (28 AWG), R, S, T, U.
Chinese E, S.
• RTD:
10 Ω copper.
100 Ω platinum (U.S. Lab. Standard, U.S. Industry Stan-
dard, European Standard).
120 Ω nickel.
Chinese 53 Ω copper.
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