I/O Specification

Question 1

ac or dc value specifies the magnitude and type of voltage signal that will be accepted

Answer 1

Nominal Input Voltage

Question 2

specifies the voltage at which the input signal is recognized as being
absolutely on

Answer 2

On-State Input Voltage Range

Question 3

specifies the minimum input current that the input devices must be capable of driving to operate the input circuit

Answer 3

Nominal Current per Input

Question 4

specifies what the maximum temperature of the air surrounding the I/O
modules should be for best operating conditions

Answer 4

Ambient Temperature Rating

Question 5

also known as response time, this value specifies the time duration for which the input
signal must be on before being recognized as a valid input

Answer 5

Input Delay

Question 6

his ac or dc value specifies the magnitude and type of voltage source that can be controlled by the output

Answer 6

Nominal Output Voltage

Question 7

specifies the minimum and maximum output operating voltages

Answer 7

Output Voltage Range

Question 8

specifies the maximum current that a single
output and the module as a whole can safely carry under load (at rated voltage)

Answer 8

Maximum Output Current Rating per Output Module

Question 9

specifies the maximum inrush current and duration (e.g. 20 A for
0.1 seconds)

Answer 9

Maximum Surge Current per Output

Question 10

specifies the maximum leakage current that flows through the
output in its OFF state

Answer 10

Off-State Leakage current per Output

Question 11

maximum voltage value that defines the isolation between the I/O circuit and the
controller’s logic circuitry

Answer 11

Electrical Isolation

Question 12

indicates the number of field inputs or outputs that can be
connected to the modules

Answer 12

Number of Inputs and Outputs per Card

Question 13

indicates the amount of current the module requires from the backplane

Answer 13

Backplane Current Draw

Question 14

specifies how accurately an analog value can be represented digitally

Answer 14

Resolution

Question 15

for analog I/Os, these values must be matched to the external device
connected to the module

Answer 15

Input Impedance and Capacitance

Question 16

refers to an analog module’s ability to prevent noise from interfering
with data integrity on a single channel and from channel to channel

Answer 16

Common Mode Rejection Ratio