National Instruments FieldPoint FP-DI-301 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.
321700B-01 ©Copyright 1997, 1999 National Instruments Corp. All rights reserved. June 1999
OPERATING INSTRUCTIONS
FP-DI-301
8-Channel, 24 V Discrete Input Module
These operating instructions describe the installation, features, and
characteristics of the FP-DI-301. For details on configuring and
accessing the FP-DI-301 over a network, refer to the user manual
for the particular FieldPoint network module you are using with
the FP-DI-301.
Features
The FP-DI-301 is a FieldPoint discrete input module with the
following features:
• 16 discrete input channels
• Sinking inputs, compatible with 24 VDC sourcing outputs
• 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-301 mounts on a FieldPoint terminal base (FP-TB-xx)
unit. The hot plug and play operation of the FP-DI-301 allows you
to install it onto a powered terminal base without disturbing
the operation of other modules or terminal bases. The FP-DI-301
receives operating power from the terminal base.

FP-DI-301 2 www.natinst.com
To install the FP-DI-301, refer to Figure 1 and follow these steps:
1. Slide the terminal base key to either position X (used for any
module) or position 5 (used for the FP-DI-301 module).
2. Align the FP-DI-301 alignmentslots with theguide rails on the
terminal base.
3. Press firmly to seat the FP-DI-301 on the terminal base. The
terminal base latch locks the FP-DI-301 into place when it is
firmly seated.
Figure 1. Module Installation Diagram
Field Wiring
The terminal base provides connections for each of the 16 input
channels and an external supply to power field devices. Each
channel can be wired for use with a sourcing output device.
Figures 2a and 2b show 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 theterminal base. Each
channel has one input terminal, Vin. In addition, there are eight
common terminals, COM (internally connected to the C terminal)
and eight supply terminals, Vsup (internally connected to the
V terminal).
Alignment
Slot
Key
Latch
Guide Rails
Terminal BaseI/O Module

© National Instruments Corp. 3 FP-DI-301
Figure 2. Basic Field Connections to Sourcing Output Devices
Table 1 lists the terminal assignments for the signals associated
with each channel.
Table 1. Terminal Assignments
Channel
Terminal Numbers
Channel
Terminal Numbers
Vin Vsup COM Vin Vsup COM
0 1 17 18 8 9 25 26
1 2 17 18 9 10 25 26
2 3 19 20 10 11 27 28
3 4 19 20 11 12 27 28
4 5 21 22 12 13 29 30
5 6 21 22 13 14 29 30
6 7 23 24 14 15 31 32
7 8 23 24 15 16 31 32
VC
+
–
a. Three-Wire Sourcing Outputs
Powered from FP-DI-301
Vin
COM
b. Externally Powered
Sourcing Outputs
Vsup
Input
Circuitry
Vin
COM
Vsup
Input
Circuitry
C+
–
Vin
Input
Circuitry
Vin
Input
Circuitry

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Discrete Input Circuit
The inputs of the FP-DI-301 consist of optical isolators with
current-limiting resistors. Each channel has one signal input, Vin,
which is referenced to the common, COM. When a voltage above
the threshold voltage is applied to the Vin input of a channel, signal
current flows through the input and turns on the optical isolator,
registering as an ON condition. The threshold voltage is typically
10 V, but may be as low as 5 V or as high as 15 V.
The FP-DI-301 has sinking inputs, which means that the inputs
sink current from the Vin terminal to the common COM terminal.
This makes the inputs compatible with sourcing output devices
capable of sourcing or driving current from a positive supply
voltagetocommon.TheFP-DO-400 andFP-DO-401are examples
for sourcing output devices.
Figure 2 shows connections to sourcing output devices. These
devices should have OFF state leakage currents of less than 1 mA
to ensure that they do not provide false ON state readings to the
FP-DI-301.
Status Indicators
Figure 3 shows the module label and status indicators. You can
remove the insertable label to see wiring diagrams for the input
channels.
Figure 3. 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-301 informs the network module of its presence. When
the network module recognizes the FP-DI-301, it sends initial

© National Instruments Corp. 5 FP-DI-301
configuration information to the FP-DI-301. After receiving, this
READY indicator turns on and the FP-DI-301 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.
Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect ANY circuits which may contain
hazardous voltages to the FP-DI-301.
This section describes the isolation of the FP-DI-301 and its
compliance with international safety standards. The field wiring
connections of the FP-DI-301 are isolated from the backplane
providedbytheterminalbase withan opticaland galvanicisolation
barrier designed and tested to provide protection against fault
voltages of up to 3000 Vrms. In addition, the FP-DI-301 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-301 is) for such an application.
Even when a product like the FP-DI-301 is used in applications
with hazardous potentials, follow these guidelines to ensure a safe
total system.
• The safety isolation of the FP-DI-301 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,

FP-DI-301 6 www.natinst.com
position, or cabinet that prevents accidental or unauthorized
access to wiring with hazardous voltages.
• The isolation of the FP-DI-301 is certified as double insulated
for normal operating voltages of 250 Vrms. Do not use the
FP-DI-301 as the sole isolating barrier between human contact
and working voltages of more than 250 Vrms.
Specifications
These specifications are typical for the range –40 to +70 °C unless
otherwise noted.
Input Characteristics
Number of channels..........................16
Input type..........................................24 VDC sinking inputs
Maximum input voltage....................30 VDC
Input threshold level .........................10 VDC typical
5 VDC minimum
15 VDC maximum
Input impedance................................5 kOhm
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
READYindicators,16 green
input state indicators
Weight...............................................130 g (4.5 oz.)
Power Requirements
Power from network module ............325 mW
Environment
Operating temperature......................–40 to +70 °C
Storage temperature..........................–55 to +100 °C
Relative humidity..............................5% to 90% non-condensing

© National Instruments Corp. 7 FP-DI-301
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 4 shows the mechanical dimensions of the FP-DI-301
installed onto a terminal base. Dimensions are given in inches
[millimeters].
Figure 4. Mechanical Dimensions
4.31
[109.5]
3.60 [91.44]
4.22 [107.19]