C Series Mounting Guidelines

Publish Date: Aug 04, 2015 | 1 Ratings | 5.00 out of 5 | Print | Submit your review

Overview

This document will help you understand the impact of mounting configurations on the maximum allowable ambient temperatures of CompactRIO, CompactDAQ, and MXI-Express RIO platforms and its impact on achieving the highest possible measurement quality when using C Series I/O.

Table of Contents

  1. CompactRIO and MXI-Express RIO Mounting Requirements
  2. CompactDAQ 9132/9133/9134/9135/9136/9137/9171/9172/9174/9178/918x/919x Mounting Requirements
  3. CompactDAQ 9179 Mounting Requirements
  4. CompactDAQ 9138/9139 Mounting Requirements
  5. C Series Maximum and Typical Specifications
  6. Module Loading and Installation Recommendations
  7. Related Links

CompactRIO, CompactDAQ, and MXI-Express RIO platforms are designed and tested in several mounting configurations over the rated ambient temperature ranges.  The varied mounting orientations or configurations can reduce the maximum allowable ambient temperature and can affect the typical accuracy of C Series IO modules in the specific platforms.  The tables below detail the maximum allowable ambient temperature ranges for operation and the impact on the ability to achieve C Series typical specifications.

Refer to your device's specifications document to determine which temperature column is appropriate for your device. 

Note: Some CompactRIO, CompactDAQ, and MXI-Express RIO systems have additional restrictions or other important information regarding thermal performance. Refer to your system user manual or operating instructions for this information. 

 

1. CompactRIO and MXI-Express RIO Mounting Requirements

Mounting Configuration/

Accessory

Mounting Orientation

Ambient Temperature Limits for Operation

C Series Typical Specifications Achievable?

0↔55C System

-20↔55C System

-40↔70C System

NI Panel Mount Kit(s) on Metallic Surface

Horizontal

0↔55C

-20↔55C

-40↔70C

Yes

NI Panel Mount Kit(s) on Metallic Surface

Any

0↔45C

-20↔45C

-40↔60C

No

NI DIN Rail Mount Kit(s)

Horizontal

0↔45C

-20↔45C

-40↔60C

Yes

NI Sliding Rack Mount Kit(s)

Horizontal

0↔45C

-20↔45C

-40↔60C

Yes

NI Desktop Kit(s)

Any

0↔45C

-20↔45C

-40↔60C

Yes

Un-mounted on desktop

Any

0↔45C

-20↔45C

-40↔60C

No

NI Panel Mount Kit(s) on Non-Metallic Surface

Any

0↔45C

-20↔45C

-40↔60C

No

Any configuration not listed

Not Officially Supported

 

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2. CompactDAQ 9132/9133/9134/9135/9136/9137/9171/9172/9174/9178/918x/919x Mounting Requirements

Mounting Configuration/Accessory

Mounting Orientation

Ambient Temperature Limits for Operation

C-Series Typical Specifications Achievable?

0↔55C

System

-20↔55C

System

-40↔70C

System

NI Panel Mount Kit(s) on Metallic Surface

Horizontal

0↔55C

-20↔55C

-40↔70C

Yes

NI Panel Mount Kit(s) on Metallic Surface

Any

0↔45C

-20↔45C

-40↔60C

No

NI DIN Rail Mount Kit(s)

Horizontal

0↔45C

-20↔45C

-40↔60C

Yes

NI Desktop Kit(s)

Any

0↔45C

-20↔45C

-40↔60C

Yes

Un-mounted on desktop

Any

0↔45C

-20↔45C

-40↔60C

Yes

NI Panel Mount Kit(s) on Non-Metallic Surface

Any

0↔45C

-20↔45C

-40↔60C

No

Any configuration not listed

Not Officially Supported

 

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3. CompactDAQ 9179 Mounting Requirements

Mounting Configuration/Accessory

Mounting Orientation

Ambient Temperature Limits for Operation

C-Series Typical Specifications Achievable?

NI Panel Mount Kit(s) on Metallic Surface

Horizontal

-20↔55C

Yes

NI Panel Mount Kit(s) on Metallic Surface

Any

-20↔45C

No

NI DIN Rail Mount Kit(s)

Horizontal

-20↔45C

Yes

NI Desktop Kit(s)

Any

-20↔45C

Yes

Un-mounted on desktop

Any

-20↔45C

No

NI Panel Mount Kit(s) on Non-Metallic Surface

Any

-20↔45C

No

Any configuration not listed

Not Officially Supported

 

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4. CompactDAQ 9138/9139 Mounting Requirements

Mounting Configuration/Accessory Mounting Orientation Maximum Ambient Temperature for Operation C-Series Typical Specifications Achievable?
NI Rack Mount Kit, Direct Mount Horizontal 55C Yes
NI Panel Mount Kit on Metallic Surface Horizontal 55C Yes
Any 45C No
NI Panel Mount Kit on Non-Metallic Surface Any 45C No
NI Rack Mount Kit, DIN Horizontal 45C Yes
NI DIN Rail Mount Kit Horizontal 45C Yes
NI Desktop Kit Horizontal 45C Yes
Any 45C No
Un-mounted on desktop Any 45C No
Any configuration not listed

Not Officially Supported

 

For mounting requirements and thermal specifications for the cDAQ-9138/9139 controller products, refer to the Tutorial NI CompactDAQ Controller Mounting and the Impact on Measurement Accuracy

For reference, Figure 1 below shows a MXI-Express RIO chassis mounted horizontally with an NI Panel Mount kit.  Figure 2 below shows a 1-Slot cDAQ sleeve mounted horizontally.

Figure 1:  NI 9157/9159 Mounted Horizontally.

Figure 2:  NI 9181 Mounted Horizontally.

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5. C Series Maximum and Typical Specifications

C Series modules are designed to provide high-accuracy measurements.  From the factory, most analog I/O modules are calibrated against a NIST-traceable precision source.  Accuracy is guaranteed for at least one year after calibration and each module can be re-calibrated through-out its life.   While C Series system components can safely be used together across the rated temperature range, analog module accuracy is sensitive to heat. 

For all measurement systems, proper wiring, noise shielding, and grounding practices are essential to achieving high accuracy analog measurements.  Assuring proper connectivity and wiring should be the first step when designing a high accuracy measurement system.  To assist in designing your system we recommend visiting the Measurement Fundamentals White Paper article.

Calculations for C Series maximum accuracy specifications assumes a worst case range of component tolerances and a full thermal load on the system (maximum processor and FPGA usage, and a chassis fully loaded with high power modules). Many C Series analog modules also provide specifications for typical accuracy.  Because most systems are not subjected to such high thermal loads and extreme component tolerance, NI also provides typical accuracies, in addition to maximum accuracies, to help guide you on the accuracy that can be expected from common configurations.  While typical specifications are not guaranteed, most systems mounted and oriented in accordance with the guidelines above will meet the published typical specifications.  C Series systems not adhering to the guidelines may also meet the published typical specifications, but are significantly less likely to do so.

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6. Module Loading and Installation Recommendations

You can increase analog module accuracy by loading the modules into your CompactRIO, CompactDAQ, or MXI-Express RIO chassis in an arrangement that separates analog modules from high-power-dissipating modules such as digital output, communications, or motion modules and from other thermally significant system components such as external power supplies, relays, -etc.  The maximum power dissipation for each module is specified in the module data sheet.  We recommend loading high-power modules and all digital modules starting with slot 1 on the left side of the chassis, and your analog modules starting on the right side of the chassis.  This will minimize the temperature rise in the analog modules and provide increased accuracy. Additionally, installations must meet the requirements for space and cabling clearance as defined in the operating instructions provide with the chassis in use. 

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7. Related Links

Product Page:  NI CompactRIO Mounting Accessories

Product Page:  NI CompactDAQ Mounting Accessories

Product Documentation: Ensuring Measurement Accuracy in High-Power CompactRIO Systems (cRIO-9081/2)

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