National Instruments FieldPoint FP-DI-330 User manual

FieldPoint ™is a trademark of National Instruments Corporation. Product and company names
mentioned herein are trademarks or trade names of their respective companies.
321633B-01 ©Copyright 1997, 1999 National Instruments Corp. All rights reserved. June 1999
OPERATING INSTRUCTIONS
FP-DI-330
8-Channel, Universal Discrete
Input Module
These operating instructions describe the installation, features, and
characteristics of the FP-DI-330. For details on configuring and
accessing the FP-DI-330 over a network, refer to the user manual
for the particular FieldPoint network module you are using with
the FP-DI-330.
Features
The FP-DI-330 is a FieldPoint discrete input module with the
following features:
• Eight discrete input channels
• Universal inputs work with any voltage from 5 V TTL level up
to 250 VDC/VAC
• Compatible with sourcing, sinking, or power sensing
applications
• On/Off LED indicators
• Hot plug and play operation
• 3,000 V input to output isolation
• Double insulated for 250 V safe working voltage
• –40 to +70 °C operation
Installation
The FP-DI-330 mounts on a FieldPoint terminal base (FP-TB-xx)
unit. The hot plug and play operation of the FP-DI-330 allows you
to install it onto a powered terminal base without disturbing

FP-DI-330 2 www.natinst.com
the operation of other modules or terminal bases. The FP-DI-330
receives operating power from the terminal base.
To install the FP-DI-330, refer to Figure 1 and follow these steps:
1. Slide the terminal base key to either position X (used for any
module) or position 3 (used for the FP-DI-330 module.)
2. Align the FP-DI-330 alignmentslots with theguide rails on the
terminal base.
3. Press firmly to seat the FP-DI-330 on the terminal base. The
terminal base latch locks the FP-DI-330 into place when it is
firmly seated.
Figure 1. Module Installation Diagram
Field Wiring
The terminal base provides connections for each of the eight input
channels and an external supply to power field devices. Each
channel can be wired for use with either a sourcing or sinking
output device, or to sense whether power is being delivered to a
load. Figure 2 shows examples of these basic wiring connections.
The connection of an external supply to power field devices is
made to the V and C terminals of the terminal base. Each channel
has two input terminals, INa and INb; a common terminal, COM
(internally connected to the C terminal); and a supply terminal,
Vsup (internally connected to the V terminal).
Alignment
Slot
Key
Latch
Guide Rails
Terminal BaseI/O Module

© National Instruments Corp. 3 FP-DI-330
Figure 2. Basic Field Connections (Five Channels Shown)
INa
Vsup
COM
INb
INa
INb
INa
INb
INa
INb
INa
Vsup
Vsup
Vsup
Vsup
COM
COM
COM
COM
INb
+
-
Power Supply for
Transducers (5-250 Volts)
Sinking (NPN,
Open Collector)
3-Wire Devices
Powered From
FP-DI-330
TerminalsSourcing (PNP,
Open Emitter)
Sinking
Sourcing
Sensing Power
Applied to a Load
VC
Devices Powered
Externally
Load

FP-DI-330 4 www.natinst.com
Table 1 lists the terminal assignments for the signals associated
with each channel.
Universal Input Circuit
The universal inputs of the FP-DI-330 consist of bi-directional
optical isolators with current-limiting circuitry. Each channel has
two signal inputs, INa and INb, which are interchangeable. When
a voltage is applied between the INa and INb inputs of a channel,
signal current flows through the input and turns on the optical
isolator, registering as an ON condition. The current-limiting
circuitry limits the amount of current flow to 1.5 mA, even when
the applied voltage is as high as 250 Vrms.
Each input is functionally isolated from the other inputs and may
be wired independently, but this is not a safety isolation.
Warning Do not mix circuits with hazardous voltages
and human accessible circuits on the same module!
For more information, refer to the Isolation and Safety Guidelines
section of this document.
Table 1. Terminal Assignments
Channel
Terminal Numbers
INa, INb Vsup COM
01, 2 17 18
13, 4 19 20
25, 6 21 22
37, 8 23 24
49, 10 25 26
511, 12 27 28
613, 14 29 30
715, 16 31 32

© National Instruments Corp. 5 FP-DI-330
Figure 3 shows a diagram of the input circuit for a single channel.
Figure 3. FP-DI-330 Input Circuit
Sensing DC Voltages
When a DC voltage (either positive or negative) with a magnitude
of at least 2.5 V is applied between the INa and INb inputs, the
FP-DI-330 senses the input as an ON. The FP-DI-330 limits the
current drawn by the input circuit to approximately 1.5 mA for
voltages up to 250 V. When the voltage applied between the INa
and INb inputs is less than 1 V, the FP-DI-330 senses the input as
an OFF. (Voltages in the transition region between 1 and 2.5 V are
not guaranteed to be either off or on. The typical threshold voltage
is 1.5 V.)
Figure 2 shows connections to sourcing output devices, sinking
outputdevices,andpoweredloads.ThesedevicesshouldhaveOFF
state leakage currents of less than 350 µA to ensure that they do not
provide false ON state readings to the FP-DI-330.
The filter on the FP-DI-330 input stages provides for a delay of
approximately 1.2 ms between the time a voltage transitions from
the ON to the OFF state and thetime the FP-DI-330 recognizesthis
change. The delay for a transition from an OFF to an ON state is
approximately 0.2 µs. Thus, a signal must be in the OFF state for
at least 1 ms before the FP-DI-330 recognizes it as being OFF.
INa
Vsup
COM
INb
Current
Limiter
AC Smoothing
Filter
V
C
Status
Indicators
Optical
Isolation

FP-DI-330 6 www.natinst.com
Sensing AC Voltages
The FP-DI-330 senses a wide range of AC signals by registering a
constant ON state while an AC voltage is present at an input. The
threshold level for AC signals depends on the frequency of the
signal. For sinusoidal signals with a frequency of 50 or 60 Hz, a
signal of at least 15 Vrms results in a constant ON state. For signals
of 1 KHz andhigher, a signal of atleast 3 Vrms results ina constant
ON state. At any frequency, a constant OFF state is guaranteed
when the peak voltage is less than 1 V. For AC signals in the
transition region between the 1 V guaranteed OFF voltage and the
guaranteed ON voltages described above, the FP-DI-330 may
register the state as either ON, OFF, or as a signal alternating
between ON and OFF.
Status Indicators
Figure 4 shows the module label and status indicators. You can
remove the insertable label to see wiring diagrams for the input
channels.
Figure 4. Status Indicators
After the module has been inserted into a terminal base (and
power is applied), the green POWER indicator turns on and the
FP-DI-330 informs the network module of its presence. When
the network module recognizes the FP-DI-330, it sends initial
configuration information to the FP-DI-330. After receiving this
READY indicator turns on and the FP-DI-330 is in its normal
operating mode. In addition to the green POWER and READY
indicators, each channel has a numbered green status indicator
which lights when the channel is in the ON state.

© National Instruments Corp. 7 FP-DI-330
Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect ANY circuits which may contain
hazardous voltages to the FP-DI-330.
This section describes the isolation of the FP-DI-330 and its
compliance with international safety standards. The field wiring
connections of the FP-DI-330 are isolated from the backplane
providedbytheterminalbase withan optical andgalvanicisolation
barrier designed and tested to provide protection against fault
voltages of up to 3000 Vrms. In addition, the FP-DI-330 provides
double insulation (compliant to IEC 1010-1) for working common
mode voltages of 250 Vrms. Safety standards (such as those
published by UL and IEC) require the use of double insulation
between hazardous voltages and any human-accessible parts or
circuits. You should never attempt to use any isolation product
between human accessible parts (such as DIN rails or monitoring
stations) and circuits which may be at hazardous potentials under
normal conditions, unless the product is specifically designed
(as the FP-DI-330 is) for such an application.
Even when a product like the FP-DI-330 is used in applications
with hazardous potentials, follow these guidelines to ensure a safe
total system.
• The safety isolation of the FP-DI-330 is from input to output,
not between channels on the same module. If any of the
channels on a module are wired at a hazardous potential,
ensure that all other devices or circuits connected to that
module are properly insulated from human contact.
•Donot share the external supply voltages (V and C on the
terminal base) with other devices (including other FieldPoint
devices) unless those devices are also isolated from human
contact.
• As with any hazardous voltage wiring, ensure that all wiring
and connections meet with applicable electrical codes or
common sense practices. Mount terminal bases in an area,
position, or cabinet that prevents accidental or unauthorized
access to wiring with hazardous voltages.
• The isolation of the FP-DI-330 is certified as double insulated
for normal operating voltages of 250 Vrms. Do not use the
FP-DI-330 as the sole isolating barrier between human contact
and working voltages of more than 250 Vrms.

FP-DI-330 8 www.natinst.com
Specifications
These specifications are typical for –40 to +70 °C unless otherwise
noted.
Input Characteristics
Number of channels..........................8
Compatibility....................................TTL, CMOS, 24 VDC,
48 VDC, 120/240 VAC
Maximum input voltage....................250 VAC or 250 VDC
Digital logic levels
Input current limiting........................1.5 mA
Input delay times...............................1 ms
Isolation ............................................3,000 Vrms
Safety isolation, working voltage .....250 Vrms, designed per IEC
1010 as double insulated
Physical
Indicators ..........................................Green POWER and
READY indicators, 8 green
input state indicators
Weight...............................................130 g (4.5 oz.)
Power Requirements
Power from network module ............200 mW
Environment
Operating temperature......................–40 to +70 °C
Storage temperature..........................–55 to +100 °C
Relative humidity..............................5% to 90% non-condensing
Logic Level Minimum Maximum
Off state (DC or peak AC) —±1 V
On state
DC
50-60 Hz AC
1 kHz AC
4 VDC
15 VAC
3 VAC
±250 VDC
250 VAC
250 VAC

© National Instruments Corp. 9 FP-DI-330
CE Mark Compliance
This product meets applicable EU directive(s) as follows:
Safety isolation .................................EN 61010 (double insulation
for 250 Vrms working
isolation, installation
category II)
EMC Directive
Immunity....................................EN 50082-1:1994
Emissions ...................................EN 55011:1991 Group I
Class A at 10 meters
Mechanical Dimensions
Figure 5 shows the mechanical dimensions of the FP-DI-330.
Dimensions are given in inches [millimeters].
Figure 5. Mechanical Dimensions
4.31
[109.5]
3.60 [91.44]
4.22 [107.19]