ABB Symphony Harmony Series, Инструкция, Страница: 130 / 402

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.