National Instruments FP-QUAD-510 User Manual

OPERATING INSTRUCTIONS

FP-QUAD-510

4-Axis, Quadrature Input Module

These operating instructions describe the installation, features, and
characteristics of the FP-QUAD-510. For details on configuring
and accessing the FP-QUAD-510 over a network, refer to the user
manual for the particular FieldPoint network module you are using
with the FP-QUAD-510.

Features

The FP-QUAD-510 is a FieldPoint quadrature input module with
the following features:

• Four independent 32-bit position counters with individual
Phase A, Phase B, and Index input terminals

• Velocity measurement capabilities

• Programmable reset on index mode

• Sinking inputs, compatible with TTL or differential devices

• Inputs protected to ±250 VDC

• Hot plug and play operation

• 2,500 Vrms input-to-output isolation

• Double insulated for 250 V safe working voltage

Power Requirement

The FP-QUAD-510 is powered via the local backplane bus from
the FieldPoint network module. The FP-QUAD-510 is a
high-power consumption module and requires more than the
nominal power allocated to an I/O module from the network
module. In some applications, this could limit the number of I/O
modules that you can connect to a single network module.

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company names mentioned herein are trademarks or trade names of their respective companies.

322633B-01© Copyright 2000 National Instruments Corp. All rights reserved. March 2000

When defining a FieldPoint system that uses an FP-QUAD-510
module, you must calculate the power consumption. First refer
to the specifications section in the user manual for your network
module. The maximum number of terminal bases per bank
multiplied by 1 watt is the total power the network module can
supply. For example, an FP-1000 or FP-1001 can support nine
terminal bases (9 × 1 W = 9 W).

Next, refer to the specifications section in the operating
instructions for the I/O modules. Use the Power from Network
Module specification. For example, a bank of modules consisting
of four FP-QUAD-5 10 and five FP-DI-301 modules requires a total
of 6.4 W from the FieldPoint network module [4 × (1.2 W) + 5 ×
(0.325 W) = 6.4 W]. This power requirement is less than the 9 W
maximum and is therefore acceptable.

Installation

The FP-QUAD-510 mounts on a FieldPoint terminal base
(FP-TB-xx) unit. Because of its hot plug and play operation, you
can install the FP-QUAD-510 onto a powered terminal base
without disturbing the operation of other modules or terminal
bases. Although the FP-QUAD-510 recei ves operating po wer from
the terminal base, the input circuitry requires an external power
supply.

To install your module, refer to Figure 1 and complete the
following steps:

1. Slide the terminal base key to either position 8 (used for the
FP-QUAD-510 module) or position X (used for any module).

Note

Although your module operates normally with the
terminal base key in either position, you should use the
position specifically for your module whenever possible.
By doing so, you avoid accidentally plugging an incorrect
module into a base once the base has been wired into the
system.

2. Align the FP-QUAD-510 alignment slots with the guide rails
on the terminal base.

3. Press firmly to seat the FP-QUAD-510 on the terminal base.
When the module is firmly seated, the terminal base latch locks
it into place.

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Alignment

Slot

Key

Latch

Guide Rails

Terminal BaseI/O Module

Figure 1.

Install Your Module

Field Wiring

The terminal base provides connections for each axis and for an
external supply to power the FP-QUAD-510 input channels and
field devices.

The FP-QUAD-510 accepts two types of encoder signal inputs:
single-ended (TTL) or differential line driver. Figure 2 shows the
typical encoder wiring for differential signal input. Figure 3 shows
the typical encoder wiring for single-ended signal input. Power for
a +5 V encoder is also provided for each axis. If you require other
encoder power voltages, reference an external supply to either the
C terminal or the COM terminal.

+–

+5 V

Reg

VC

V

sup

+A
–A

+B
–B

+I
–I

COM

Encoder

+5 V

+A
–A

+B
–B

+Index
–Index

GND

Figure 2.

© National Instruments Corp. 3 FP-QUAD-510

Basic Field Connections to Differential Encoders

+–

Figure 3.

VC

Reg

V

sup

+A
–A

+B
–B

+I
–I

COM

NC

NC

NC

+5 V

Basic Field Connections to Single-Ended Encoders

Encoder

+5 V

+A

+B

+Index

GND

The FP-QUAD-510 supports differential inputs for Phase A,
Phase B, and Index signals. You can easily accommodate encoders
with various phase relationships by swapping the signals and/or
connecting them to the inverting inputs as specific applications
require.

The Index signal must occur when both the Phase A and Phase B
signals are low, as shown in Figure 4. If the index polarity is
inverted, try re versing the +Index and –Inde x signals on differential
encoders or using the –Index input on single-ended encoders.

Phase A

Phase B

Index

Figure 4.

Encoder Signal Phasing

Table 1 lists the terminal assignments for the signals of each axis.
+A and –A represent the Phase A signals, +B and –B represent the
Phase B signals, and +I and –I represent the Index signals.

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