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Questions and Answers
What is keying?
What is keying?
Keying is a feature that reduces the possibility that you use the wrong device in a control system.
What is electronic keying?
What is electronic keying?
A keying system that automatically compares the expected device to the installed device.
What are the three keying options available?
What are the three keying options available?
Compatible Module, Disable Keying, Exact Match.
What attributes does electronic keying consider?
What attributes does electronic keying consider?
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Who is an example of a vendor?
Who is an example of a vendor?
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What does the product code represent?
What does the product code represent?
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What is a major revision?
What is a major revision?
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What does the minor revision number indicate?
What does the minor revision number indicate?
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What should be used when a device revision must match exactly?
What should be used when a device revision must match exactly?
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What happens when you change electronic keying parameters online?
What happens when you change electronic keying parameters online?
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What does disable keying allow?
What does disable keying allow?
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What is a warning associated with disable keying?
What is a warning associated with disable keying?
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What does connection fault indication entail?
What does connection fault indication entail?
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What can be monitored using a GSV instruction?
What can be monitored using a GSV instruction?
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Fault members are set to ______ automatically in Module Input Tags when a connection is not established.
Fault members are set to ______ automatically in Module Input Tags when a connection is not established.
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Study Notes
Key Concepts of Electronic Keying
- Keying minimizes the likelihood of using incorrect devices in control systems.
- Electronic Keying automatically verifies the device connected to a control system against the expected device defined in RSLogix 5000 or Logix Designer. A fault occurs if the keying check fails, preventing communication.
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Keying Options for devices include:
- Compatible Module
- Disable Keying
- Exact Match
Keying Attributes and Criteria
- Keying Criteria for Electronic Keying includes attributes unique to each product revision: Vendor, Device Type, Product Code, Major Revision, and Minor Revision.
- Vendor refers to the manufacturer, like Rockwell Automation.
- Device Type categorizes the product, e.g., communication adapter or digital I/O module.
- Product Code specifies the product type and serves as a catalog number, helping to differentiate similar devices.
- Major Revision indicates functional capabilities and is generally backwards compatible.
- Minor Revision reflects behavior changes, not functional capabilities.
Keying Options Explained
- Compatible Module Keying (default setting) allows devices to accept communication if they can emulate the expected device based on specific product and revision criteria.
- Disable Keying ignores keying attributes, allowing any device to communicate, which may cause unpredictable results and operational issues.
- Strong caution is advised with Disable Keying; incorrect usage can result in severe safety and operational risks.
- Exact Match requires all keying attributes to match precisely. Not suitable for flexible environments but essential in regulated industries and for firmware updates.
Fault Detection and Status Indicators
- Connection Fault Indication varies by control system; multiple methods are recommended for monitoring faults linked to Electronic Keying.
- Controller Status Display shows fault codes, but may not provide comprehensive fault information when multiple faults occur.
- Module and Project Status Indicators flash indicators to signal faults, and the project may list a faulted state during a Run mode failure.
- Major Faults Tab in the Controller Properties explains faults that occur in detail.
- I/O Configuration Folder displays a warning symbol for any faults, prompting deeper investigation into the connection tab.
Diagnostic Tools
- Connection Tab offers insight into module fault codes and descriptions for troubleshooting.
- Module Info Tab identifies Module Identity mismatches, crucial for resolving configuration issues.
- Module Input Tag automatically sets fault statuses to true when connection failures occur, useful for troubleshooting.
- Get System Value (GSV) Instruction is utilized to monitor device status, specifically tracking FaultCode and FaultInfo for diagnostics.
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Description
This quiz covers essential concepts of electronic keying in Logix5000 control systems. Learn about keying features that ensure the correct device usage and how the system compares installed devices with project definitions in RSLogix 5000.
