National Instruments Welding System FP AI 112 User Manual

FieldPointOperating Instructions  
FP-AI-112 and cFP-AI-112  
16-Channel, 16-Bit Analog Input Modules  
These operating instructions describe how to install and use the  
FP-AI-112 and cFP-AI-112 analog input modules (referred  
to inclusively as the [c]FP-AI-112). For information about  
configuring and accessing the [c]FP-AI-112 over a network, refer  
to the user manual for the FieldPoint network module you are  
using.  
Features  
The [c]FP-AI-112 is a FieldPoint analog input module with the  
following features:  
16 analog voltage input channels  
Eight voltage input ranges: 0–1 V, 0–5 V, 0–10 V, 60 mV,  
300 mV, 1 V, 5 V, and 10 V  
16-bit resolution  
50 and 60 Hz filter settings  
250 Vrms CAT II continuous channel-to-ground isolation,  
verified by 2,300 Vrms,1 minute dielectric withstand test  
–40 to 70 °C operation  
Hot swappable  
Installing the FP-AI-112  
The FP-AI-112 mounts on a FieldPoint terminal base (FP-TB-x),  
which provides operating power to the module. Installing the  
FP-AI-112 onto a powered terminal base does not disrupt the  
operation of the FieldPoint bank.  
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3. Using a number 2 Phillips screwdriver with a shank of at least  
64 mm (2.5 in.) length, tighten the captive screws to 1.1 N m  
(10 lb in.) of torque. The nylon coating on the screws prevents  
them from loosening.  
4
3
5
2
4
2
1
1
2
3
cFP-AI-112  
Captive Screws  
cFP Controller Module  
4
5
Screw Holes  
cFP Backplane  
Figure 2. Installing the cFP-AI-112  
Wiring the [c]FP-AI-112  
The FP-TB-x terminal base has connections for each of the  
16 input channels and for an optional external power supply to  
power field devices. The cFP-CB-x connector block provides the  
same connections. Each channel has one input terminal (VIN) for  
voltage input. All 16 inputs are referenced to the COM terminals,  
which are internally connected to each other and to the C terminals.  
The channels share eight VSUP terminals, all of which are internally  
connected to each other and to the V terminals.  
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You can use an external power supply to power field devices.  
Connect the positive lead of the external power supply to both  
V terminals and the negative lead to both C terminals. Ensure that  
the current through both V terminals can never exceed 2 A.  
Install 2 A maximum, fast-acting fuses between the external power  
supply and the V terminals. The wiring diagrams in this document  
show fuses where appropriate.  
Table 1 lists the terminal assignments for the signals associated  
with each channel. The terminal assignments are the same for the  
FP-TB-x terminal bases and the cFP-CB-x connector blocks.  
Table 1. Terminal Assignments  
Terminal Numbers  
VIN  
1
VSUP  
17  
17  
19  
19  
21  
21  
23  
23  
25  
25  
27  
27  
29  
29  
31  
31  
Channel  
COM  
18  
18  
20  
20  
22  
22  
24  
24  
26  
26  
28  
28  
30  
30  
32  
32  
0
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10  
11  
12  
13  
14  
15  
16  
10  
11  
12  
13  
14  
15  
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Caution Cascading power between two modules defeats  
isolation between those modules. Cascading power from  
the network module defeats all isolation between  
modules in the FieldPoint bank.  
Measuring Voltage with the [c]FP-AI-112  
Figure 3 shows how to connect a voltage source without an  
external power supply to one channel of the [c]FP-AI-112.  
C
V
V
SUP  
V
IN  
Input  
Circuitry  
+
Voltage  
Source  
>100 MΩ  
Input  
Impedance  
COM  
[c]FP-AI-112  
Figure 3. Voltage Source without External Power Supply  
Figure 4 shows how to connect a voltage source with an external  
power supply to one channel of the [c]FP-AI-112.  
+
External  
Power Supply  
(Optional)  
2 A  
Max  
C
V
V
SUP  
Powered  
Voltage  
Transducer  
V
+
OUT  
IN  
Input  
Circuitry  
>100 MΩ  
Input  
Impedance  
COM  
[c]FP-AI-112  
Figure 4. Voltage Source with External Power Supply  
© National Instruments Corp.  
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Input Ranges  
The input ranges for voltage signals are 0–1 V, 0–5 V, 0–10 V,  
60 mV, 300 mV, 1 V, 5 V, and 10 V. To prevent inaccurate  
readings, choose an input range such that the signal you are  
measuring does not exceed either end of the range. Signals that  
greatly exceed the configured range can adversely affect  
measurements on other channels.  
Measurements on a channel may be invalid for up to one update  
period after you change the input range.  
Overranging  
The [c]FP-AI-112 has an overranging feature that measures a little  
beyond the nominal values of each range. For example, the actual  
measurement limit of the 10 V range is 10.4 V. The overranging  
feature enables the [c]FP-AI-112 to compensate for field devices  
with span errors of up to +4% of full scale. Also, the overranging  
feature helps prevent errors caused by clipping.  
Filter Settings  
Three filter settings are available for each channel. The filters  
on the [c]FP-AI-112 input channels are comb filters that provide  
notches of rejection at multiples, or harmonics, of a fundamental  
frequency. You can select a fundamental frequency of 50, 60,  
or 500 Hz. At the 50 and 60 Hz settings, the [c]FP-AI-112 applies  
95 dB of rejection at the fundamental frequency and at least 60 dB  
of rejection at each of the harmonics. In many cases, most of the  
noise components of input signals are related to the local AC power  
line frequency, so a filter setting of either 50 or 60 Hz is best.  
The 500 Hz filter setting provides faster update rates but much less  
accurate measurements.  
Update Rate  
The update rate of the [c]FP-AI-112 is determined by the filter  
settings and the number of input ranges in use. Higher filter  
settings and fewer input ranges yield faster update rates. Use the  
following formula to determine the approximate update period:1  
(number of channels with 50 Hz filter) × 0.061 s +  
(number of input ranges with 50 Hz filter) × 0.12 s +  
(number of channels with 60 Hz filter) × 0.051 s +  
1
The update rate is the reciprocal of the update period.  
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(number of input ranges with 60 Hz filter) × 0.10 s +  
(number of channels with 500 Hz filter) × 0.007 s +  
(number of input ranges with 500 Hz filter) × 0.012 s + 0.16 s  
= Update Period  
For the fastest performance, configure all unused channels for the  
500 Hz filter setting and for an input range in use on one or more  
other channels with the 500 Hz filter setting. For example, if  
10 channels are configured for 0–10 V input and 500 Hz, four  
channels are configured for 0–5 V and 60 Hz, and two channels  
are unconnected, use the FieldPoint software to configure the  
unconnected channels for 0–10 V input and 500 Hz filter setting.  
Some combinations of two input ranges count as only one range for  
calculating update rates. Those combinations are 60 mV and  
300 mV; 0–1 V and 0–5 V; and 1 V and 5 V.  
The update rate does not affect the rate at which the network  
module reads the data. Set up your application so that the update  
rate is faster than the rate at which the network module polls the  
[c]FP-AI-112 for data.  
Status Indicators  
The [c]FP-AI-112 has two green status LEDs, POWER and  
READY. After you insert the [c]FP-AI-112 into a terminal base or  
backplane and apply power to the connected network module, the  
green POWER indicator lights and the [c]FP-AI-112 informs the  
network module of its presence. When the network module  
recognizes the [c]FP-AI-112, it sends initial configuration  
information to the [c]FP-AI-112. After the [c]FP-AI-112 receives  
this initial information, the green READY indicator lights and the  
module is in normal operating mode.  
Upgrading the FieldPoint Firmware  
You may need to upgrade the FieldPoint firmware when you add  
new I/O modules to the FieldPoint system. For information on  
determining which firmware you need and how to upgrade your  
firmware, go to ni.com/info and enter fpmatrix.  
© National Instruments Corp.  
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Isolation and Safety Guidelines  
Caution Read the following information before  
attempting to connect the [c]FP-AI-112 to any circuits  
that may contain hazardous voltages.  
This section describes the isolation of the [c]FP-AI-112 and its  
compliance with international safety standards. The field wiring  
connections are isolated from the backplane and the inter-module  
communication bus. The isolation barriers in the module provide  
250 Vrms Installation Category II continuous isolation, verified by  
2,300 Vrms, 1 minute dielectric withstand test. The [c]FP-AI-112  
provides double insulation (compliant with IEC 61010-1) for  
working voltages of 250 Vrms1. 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.  
Never try to use any isolation product between human-accessible  
parts (such as DIN rails or monitoring stations) and circuits that  
can be at hazardous potentials under normal conditions, unless the  
product is specifically designed for such an application, as is the  
[c]FP-AI-112.  
Even though the [c]FP-AI-112 is designed to handle applications  
with hazardous potentials, follow these guidelines to ensure a safe  
total system:  
There is no isolation between channels on the [c]FP-AI-112.  
If a hazardous voltage is present on any channel, all channels  
are considered hazardous. Make sure that all other devices and  
circuits connected to the module are properly insulated from  
human contact.  
Do not share the external supply voltages (the V and C  
terminals) with other devices (including other FieldPoint  
devices), unless those devices are isolated from human contact.  
For Compact FieldPoint, you must connect the protective earth  
(PE) ground terminal on the cFP-BP-x backplane to the system  
safety ground. The backplane PE ground terminal has the  
following symbol stamped beside it: . Connect the  
backplane PE ground terminal to the system safety ground  
1
Working voltage is defined as the signal voltage plus the common-mode voltage.  
Common-mode voltage is the voltage of the module with respect to ground.  
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using 14 AWG (1.6 mm) wire with a ring lug. Use the 5/16 in.  
panhead screw shipped with the backplane to secure the ring  
lug to the backplane PE ground terminal.  
As with any hazardous voltage wiring, make sure that all  
wiring and connections meet applicable electrical codes and  
commonsense practices. Mount terminal bases and backplanes  
in an area, position, or cabinet that prevents accidental or  
unauthorized access to wiring that carries hazardous voltages.  
Do not use the [c]FP-AI-112 as the only isolating barrier  
between human contact and working voltages higher than  
250 Vrms  
.
Operate the [c]FP-AI-112 only at or below Pollution Degree 2.  
Pollution Degree 2 means that only nonconductive pollution  
occurs in most cases. Occasionally, however, a temporary  
conductivity caused by condensation must be expected.  
Do not operate FieldPoint products in an explosive atmosphere  
or where there may be flammable gases or fumes. If you need  
to operate FieldPoint products in such an environment, the  
FieldPoint products must be in a suitably rated enclosure.  
Operate the [c]FP-AI-112 at or below Installation Category II.  
Installation Category II is for measurements performed on  
circuits directly connected to the low-voltage installation.  
This category refers to local-level distribution, such as that  
provided by a standard wall outlet.  
Specifications  
The following specifications are typical for the –40 to 70 °C  
temperature range and for 50 and 60 Hz filter settings unless  
otherwise noted. Specifications are subject to change without  
notice.  
Input Characteristics  
Number of channels..........................16  
ADC resolution.................................16 bits at 50 or 60 Hz;  
10 bits at 500 Hz  
(refer to table)  
Type of ADC.....................................Delta-sigma  
© National Instruments Corp.  
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Effective resolution by input range and filter setting  
Effective  
Effective  
Resolution*  
at 500 Hz  
Nominal  
With  
Resolution*  
Input Range Overranging  
at 50 or 60 Hz  
60 mV  
300 mV  
1 V  
65 mV  
325 mV  
1.04 V  
3 µV  
16 µV  
40 µV  
190 µV  
380 µV  
20 µV  
95 µV  
190 µV  
25 µV  
100 µV  
300 µV  
1500 µV  
3000 µV  
300 µV  
1500 µV  
3000 µV  
5 V  
5.2 V  
10 V  
10.4 V  
0–1 V  
0–5 V  
0–10 V  
0–1.04 V  
0–5.2 V  
0–10.4 V  
*Includes quantization errors and typical rms noise.  
Update period and input bandwidth by filter setting  
Filter Settings  
60 Hz  
Characteristic  
Update period*  
Input bandwidth (–3 dB)  
50 Hz  
500 Hz  
1.25–1.75 s 1.05–1.45 s 0.27–0.32 s  
13 Hz 16 Hz 130 Hz  
* Applies when all 16 channels are set to the same filter setting. Refer to  
the Update Rate section for information about calculating the update rate.  
Normal-mode rejection.....................95 dB  
Nonlinearity......................................0.0015% (monotonicity1  
warranted over the operating  
temperature range)  
Input impedance (with power on).....>100 MΩ  
Overvoltage protection ..................... 40 V  
Input current  
25 °C...........................................400 pA typ, 1 nA max  
70 °C...........................................3 nA typ, 15 nA max  
1
A characteristic of an ADC in which the digital code output always increases as the  
value of the analog input to it increases.  
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Typical and warranted accuracy by input range and temperature  
range  
Typical Accuracy  
at 15 to 35 °C  
(% of Reading;  
% of Full Scale)  
Warranted Accuracy  
at 15 to 35 °C  
(% of Reading;  
% of Full Scale)  
Nominal  
Input Range  
60 mV  
300 mV  
1 V  
0.03%; 0.05%  
0.03%; 0.015%  
0.03%; 0.008%  
0.03%; 0.005%  
0.03%; 0.005%  
0.03%; 0.005%  
0.03%; 0.003%  
0.03%; 0.003%  
0.05%; 0.3%  
0.05%; 0.1%  
0.05%; 0.04%  
0.05%; 0.02%  
0.05%; 0.02%  
0.05%; 0.03%  
0.05%; 0.01%  
0.05%; 0.01%  
5 V  
10 V  
0–1 V  
0–5 V  
0–10 V  
Typical Accuracy  
at –40 to 70 °C  
(% of Reading;  
% of Full Scale)  
Warranted Accuracy  
at –40 to 70 °C  
(% of Reading;  
% of Full Scale)  
Nominal  
Input Range  
60 mV  
300 mV  
1 V  
0.06%; 0.35%  
0.06%; 0.08%  
0.06%; 0.03%  
0.06%; 0.01%  
0.06%; 0.01%  
0.06%; 0.025%  
0.06%; 0.007%  
0.06%; 0.005%  
0.10%; 1.50%  
0.10%; 0.40%  
0.10%; 0.13%  
0.10%; 0.04%  
0.10%; 0.03%  
0.10%; 0.12%  
0.10%; 0.03%  
0.10%; 0.02%  
5 V  
10 V  
0–1 V  
0–5 V  
0–10 V  
Note Full scale is the maximum value of the nominal  
input range. For example, for the 10 V input range,  
full scale is 10 V and 0.01% of full scale is 1 mV.  
Gain error drift.................................. 20 ppm/°C  
Offset error drift................................6 µV/°C  
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Physical Characteristics  
Indicators ..........................................Green POWER and  
READY indicators  
Weight  
FP-AI-112...................................142 g (5.0 oz)  
cFP-AI-112.................................113 g (4.0 oz)  
Power Requirements  
Power from network module ............350 mW  
Isolation Voltage  
Channel-to-ground isolation  
Continuous .................................250 Vrms  
,
Installation Category II  
Dielectric withstand....................2,300 Vrms, 1 minute  
Channel-to-channel isolation............None  
Environmental  
FieldPoint modules are intended for indoor use only. For outdoor  
use, they must be mounted inside a sealed enclosure.  
Operating temperature ......................40 to 70 °C  
Storage temperature..........................50 to 85 °C  
Humidity...........................................10 to 90% RH,  
noncondensing  
Maximum altitude.............................2,000 m; at higher altitudes  
the isolation voltage ratings  
must be lowered.  
Pollution Degree ...............................2  
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Shock and Vibration  
These specifications apply only to the cFP-AI-112.  
NI recommends Compact FieldPoint if your application  
is subject to shock and vibration.  
Operating vibration, random  
(IEC 60068-2-64)..............................10–500 Hz, 5 grms  
Operating vibration, sinusoidal  
(IEC 60068-2-6)................................10–500 Hz, 5 g  
Operating shock  
(IEC 60068-2-27)..............................50 g, 3 ms half sine,  
18 shocks at 6 orientations;  
30 g, 11 ms half sine,  
18 shocks at 6 orientations  
Safety  
This product is designed to meet the requirements of the following  
standards of safety for electrical equipment for measurement,  
control, and laboratory use:  
IEC 61010-1, EN 61010-1  
UL 61010-1  
CAN/CSA-C22.2 No. 61010-1  
Note For UL, hazardous locations, and other safety  
certifications, refer to the product label, or visit  
ni.com/certification, search by model number or  
product line, and click the appropriate link in the  
Certification column.  
Electromagnetic Compatibility  
Emissions..........................................EN 55011 Class A at 10 m;  
FCC Part 15A above 1 GHz  
Immunity...........................................EN 61326:1997 + A2:2001,  
Table 1  
CE, C-Tick, and FCC Part 15 (Class A) Compliant  
Note For EMC compliance, operate this device with  
shielded cabling.  
© National Instruments Corp.  
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CE Compliance  
This product meets the essential requirements of applicable  
European Directives, as amended for CE marking, as follows:  
Low-Voltage Directive (safety).........73/23/EEC  
Electromagnetic Compatibility  
Directive (EMC) ...............................89/336/EEC  
Note Refer to the Declaration of Conformity (DoC) for  
this product for any additional regulatory compliance  
information. To obtain the DoC for this product, visit  
ni.com/certification, search by model number or  
product line, and click the appropriate link in the  
Certification column.  
Mechanical Dimensions  
Figure 5 shows the mechanical dimensions of the FP-AI-112  
installed on a terminal base. If you are using the cFP-AI-112,  
refer to the Compact FieldPoint controller user manual for the  
dimensions and cabling clearance requirements of the Compact  
FieldPoint system.  
107.19 mm  
(4.22 in.)  
109.5 mm  
(4.31 in.)  
91.44 mm  
(3.60 in.)  
Figure 5. FP-AI-112 Mechanical Dimensions  
FP-AI-112 and cFP-AI-112  
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Where to Go for Support  
For more information about setting up the FieldPoint system, refer  
to these National Instruments documents:  
FieldPoint network module user manual  
Other FieldPoint I/O module operating instructions  
FieldPoint terminal base and connector block operating  
instructions  
Go to ni.com/support for the most current manuals, examples,  
and troubleshooting information.  
National Instruments corporate headquarters is located at 11500  
North Mopac Expressway, Austin, Texas, 78759-3504. National  
Instruments also has offices located around the world to help  
address your support needs. For telephone support in the United  
States, create your service request at ni.com/support and follow  
the calling instructions or dial 512 795 8248. For telephone  
support outside the United States, contact your local branch office:  
Australia 1800 300 800, Austria 43 0 662 45 79 90 0,  
Belgium 32 0 2 757 00 20, Brazil 55 11 3262 3599,  
Canada (Calgary) 403 274 9391, Canada (Ottawa) 613 233 5949,  
Canada (Québec) 450 510 3055, Canada (Toronto) 905 785 0085,  
Canada (Vancouver) 604 685 7530, China 86 21 6555 7838,  
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,  
Finland 385 0 9 725 725 11, France 33 0 1 48 14 24 24,  
Germany 49 0 89 741 31 30, India 91 80 51190000,  
Israel 972 0 3 6393737, Italy 39 02 413091,  
Japan 81 3 5472 2970, Korea 82 02 3451 3400,  
Malaysia 603 9131 0918, Mexico 01 800 010 0793,  
Netherlands 31 0 348 433 466, New Zealand 0800 553 322,  
Norway 47 0 66 90 76 60, Poland 48 22 3390150,  
Portugal 351 210 311 210, Russia 7 095 783 68 51,  
Singapore 65 6226 5886, Slovenia 386 3 425 4200,  
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,  
Sweden 46 0 8 587 895 00, Switzerland 41 56 200 51 51,  
Taiwan 886 2 2528 7227, Thailand 662 992 7519,  
United Kingdom 44 0 1635 523545  
© National Instruments Corp.  
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FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation.  
Product and company names mentioned herein are trademarks or trade names of their respective companies.  
For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,  
the patents.txt file on your CD, or ni.com/patents.  
© 2004 National Instruments Corp. All rights reserved.  
*371330A-01*  
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