User Manual

11 Chapter 2
.
Table 2.1: I/O Selection Guidelines
Type of I/O
module:
For these types of field
devices or operations (exam-
ples):
Explanation:
Discrete input
module and
block I/O
module
Selector switches, push but-
tons, photoelectric eyes, limit
switches, circuit breakers, prox-
imity switches, level switches,
motor starter contacts, relay
contacts, thumb-wheel switches
Input modules sense
ON/OFF or OPENED/
CLOSED signals
Discrete out-
put module
and block I/O
module
Alarms, control relays, fans,
lights, horns, valves, motor
starters, solenoids
Output module signals
interface with ON/OFF
or OPENED/CLOSED
devices
Analog input
module
Thermocouple signals, RTD
signals, temperature transduc-
ers, pressure transducers, load
cell transducers, humidity trans-
ducers, flow transducers,
potentiometers.
Convert continuous
analog signals into
input values for host
device
Analog output
module
Analog valves, actuators, chart
recorders, electric motor drives,
analog meters
Interpret host device's
output to analog sig-
nals (generally
through transducers)
for field devices.