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   Compatibility
1756-L74  B  31.011
  
1756-L74  B  30.014
  
1756-L74  B  30.013
  
1756-L74  B  30.012
  
1756-L74  B  30.011
  
1756-L74  B  29.011
  
1756-L74  B  28.012
  
1756-L74  B  28.011
  
1756-L74  B  27.011
  
1756-L74  B  26.013
  
1756-L74  B  26.012
1756-L74  B  24.012
1756-L74  B  24.011
1756-L74  B  23.012
1756-L74  B  21.011
1756-L74  B  20.019
1756-L74  B  20.018
1756-L74  B  20.015
1756-L74  B  20.014
1756-L74  B  20.013
1756-L74  B  20.012
1756-L74  B  20.011
1756-L74  B  19.015
1756-L74  B  19.013
   Release Notes   Show ALL
   Features 1756-L74
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Electronic Data Sheet AOP     
Extended Tag Properties     
HMI Connectivity and Performance Improvements     
Logix Designer, Design Environment and Application     
Logix Tree, Enhancements to Finding-Adding Devices
Logix Tree, Module Discovery
Project Documentation Stored in Controller     
SequenceManager Available     
SOE-Input and Scheduled-Output Modules     
Pre-scan of Add-On Instruction Behavior     
Alarm Shelving support for Logix device-based Alarms     
ALMA and ALMD Instructions     
Expanded Socket Connections Support
QuickConnect     
Unicast Produce/Consume Safety
Unicast Produce/Consume Safety I/O
Communication Slot, Restricted
Kinetix 5500 CIP-Motion Servo Drives     
Kinetix 5500 CIP-Safety Drives Supported     
Third Party Motor Support     
Updated Motion Coordinate Linear Move Instruction Merge All Functionality     
Automatic Device Configuration for Drives (ADC)     
Drive Multiplexing Provides Support for Multiple Coarse Update Rates     
High-speed Drive-based Data Logging on Kinetix 5500 Drives     
Interpolated Actual Position Acceleration Compensation     
Master Driven Speed Control (MDSC)     
PowerFlex 527 AC Drive Available     
Torque Prove on Kinetix 5500 Drives     
Kinetix 6000M Integrated Drive-Motor Systems     
HMI Button Control Instructions     
Component Change Detection     
Change Detection Audit Value     
Security Authority for Authentication and Authorization     
   Firmware Migration 1756-L74
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27.011		 1756-L74
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26.013
1756-L73/A 18.x
1756-L73/A 19.5x
1756-L73/A 19.x
   Anomaly 1756-L74
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30.013		 1756-L74
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26.013
CompactLogix Wall Clock Time (WCT) jumps ahead by 100 years (Lgx00152701, Lgx00179778)     
A Program’s First Scan May Not Occur if the Program is Uninhibited     
After power cycling, the controller SFC routines do not execute properly (00229202)     
Alarm Log Content Lost at Powerup (Lgx00138163)     
ALMA Instruction in a FBD Intermittently Clears the EnableOut Bit     
Applications with PowerFlex drives in the I/O configuration can experience a major non-recoverable fault (MNRF)     
Audit Mask Value     
Automatic Device Configuration     
Axis stuck in synchronizing state when SSV and inhibiting axis on the same module (00229573)     
Backlash is applied in the Wrong Direction when Motion Polarity is set to Inverted     
Blank Project Size Larger Than Expected (00177148)     
Cannot Overwrite Add-On Instruction if Edit Date is the Same     
CIP Motion Axis Feedback 1 and 2 length incorrectly converted by the controller (00218528)     
CIP™ Axis Velocity Loop Causes Controller To MNRF/Assert     
ConfigUpdateInProcess bit does not change state when issuing an SSV instruction to change the value of the Conversion constant (     
Connected Cached Messages Do Not Time Out after Repeated Connection Requests     
Consumed axis actual position exceeds the produced axis unwind position (00225674)     
Controller Anomaly with Continuous Task, Indirect Addressing, and CONCAT or DTOS     
Controller Appears to Be Stuck in the Transition to Run Mode (Lgx00154875)     
Controller Can Assert During The I/O Module Configuration Process     
Controller can MNRF or lock up with the Logix Designer Application during online edit     
Controller Does Not Transition to Run Mode after Online Edit of PowerFlex Drive Parameters (00219408)     
Controller Faults When Alarm Instruction Executes (Lgx00135333)     
Controller Power Cycle     
Controller Time Offset Change Not Sent to Kinetix® Drives (00179939)     
Disable Download Project Documentation and Extended Properties Features     
Drive Instability With Frequent Wall Clock Time Update Requests (00174495)     
Dual Feedback position error jumps (00232347, 00232504)     
Equipment Phase Failure (PFL) instruction does not support all DINT values -2147483648 to 2147483647     
Events in Sequence Missed (00176328)     
Execution of a MAS Instruction results in error 104 (00213035)     
Fail Drive Connection on Peripheral Error (Lgx00138238)     
Failed HMI Connection Not Restored (00177589)     
Fatal Error After Current Language Selection (00174107)     
Firmware Supervisor Does Not Update Kinetix 5700 2198-D032-ERS4 Drive Firmware     
Firmware Supervisor fails with “(Code 16#fe11) Automated Firmware Update Failed: Firmware file invalid.”     
Grandmaster Clock Description Not Correctly Being Displayed     
HMI Tags on Scan     
Homing an axis introduces a spike in the Actual Velocity attribute (00225946)     
Internal Floating Point Calculation     
Kinetix 5700 Operation Disabled     
Kinetix 6500 K6500 Drive Bus Regulator Action Attribute Rejection (00160680)     
Launch RSLogix 5000 Software     
Load from SD Card Overwrites Controller Serial Number     
MAJ Instruction (Lgx00136317, Lgx00150458)     
Major Non-recoverable Fault Editing a Constant Structured Tag     
Major Non-recoverable Fault Occurs During Online Editing (00140975)     
MCLM (Motion Coordinated Linear Move) ERR 78 after Power Loss     
MCLM/MCCM Set to Merge All Can Cause Controller MNRF (00220553)     
Media Removed     
Media Space Calculation Incorrect with 3rd-party Secure Digital Cards (00175295)     
Message Instructions in Add-On Instruction PreScan and Main Logix Routines (Lgx00152820)     
Minor Battery Fault     
Module Configuration Greater than 255 Bytes     
Motion Servo On (MSO) Instruction Resets Commanded Position to Zero     
Nested SFC with Selection Branch execution on first transition may be incorrect (00227908)     
Online Configuration Change Results in Module Reconfiguration Error (00165439)     
Online Configuration Changes Fail for Dynamix 1444 Series Module (00166830)     
Online Editing of PowerFlex Drives (00227003)     
Partial Import Online (PIO) Edits on GuardLogix Controllers Causes Logix Designer to go Offline     
Passive hookup tests do not execute when a Kinetix 6200 Drive is in the Shutdown State     
PCMD Returns Incorrect Error Code     
PhaseManager and SequenceManager Show Different States of Phase in Program Mode     
Power cycle while coordinated motion is in progress can MNRF the controllers     
PowerFlex 750 Series Drives     
Produce/Consume Data Integrity     
Reconfigure Message Instruction Active When Controller is Power Cycled Causes a Major Non-Recoverable Fault (Lgx168703)     
Reconfigure Message Instruction Causes a Major Non-Recoverable Fault (Lgx00131221)     
Resetting the Status attribute of the first element of a cam profile array can result in a MNRF     
RSLogix 5000 Clock Update Tool     
SD Card Can Cause Major Fault     
Second Download Fails     
Secure Digital Card Reported to be Out of Memory (Lgx00141748, Lgx00137046)     
Sequence Manager Event Client 2.0 Can Experience Slow Performance When Using the Start Up Recovery Option     
SequenceManager Event Client 2.0 Cannot Reliably Recover Events on Startup of The Service     
Sequential Function Chart Executes Incorrectly (00167203)     
Some Faults Are Not Logged in The Controller Log     
SRT (Sort) instruction with a large length can cause the controller to MNRF     
Tag Incorrectly Identified as Being on Scan     
UID and UIE instructions in a Continuous Task (Lgx00149169)     
Unexpected command sent to phase when connection is lost to Logix Designer (00224198)     
UnitID member is not cleared to zero when FactoryTalk Batch is disconnected (00219832)     
Using compare instruction with string data types (00223326, 00223030)     
Using Firmware Supervisor to Update a 193-ECM-ETR E300 Can Cause the Controller to MNRF     
Value That Is Outside the Supported WallClockTime Range     
Wall Clock Time Incorrect After Controller Reset (00177851)     
Wall Clock Value Different From Previous Value (00169756)     
WallClockTime jumps ahead by 100 years on Controller Power Cycles     
Add-On Instruction InOut Parameter Data Passed Incorrectly (Lgx00151581, Lgx00149836)     
Multiple Add On Instructions     
ALMA and ALMD Instructions in Logix Designer     
Buffer Timeout for FactoryTalk Alarms and Events Subscribers     
MinDurationPRE and MinDurationACC Members     
Third Party Communication Software     
Controller Faults After a Firmware Update and Project Download (00177371)     
Incorrect Firmware Saved to Secure Digital Card (00178137)     
Denormalized Number in Rate of Change Parameter Can Cause Major Non-recoverable Fault (Lgx00141745, Lgx00141153)     
S Curve Function Blocks     
Axis CIP Drive Data Type     
Axis Position Register     
CIP Axis State Indicated Incorrectly (00170315)     
Command Update Delay Offset     
Cyclic Travel Mode     
Cyclic Travel Mode and Actual Position Exceeds Unwind Position     
Cyclic Travel Mode and Motion Polarity Inverted     
Incorrect Velocity     
MAW Watch Position     
Soft Overtravel Condition     
Activating MCT or MCTO simultaneously with a Stopping Instruction Causes a MNRF     
Axis Stopping Distance or Stopping Action Differs Significantly Between Configurations (Lgx00141754, Lgx00138349)     
Controller Faults After Executing a Misprogrammed Motion Coordinated Circular Move Instruction (Lgx00155083, Lgx00154717)     
Controller Faults During Execution of Motion Coordinated Circular Move Instruction (00171086)     
Coordinated Merge All     
Major Non-recoverable Fault Occurs When There is Interference of Two Merging MCLM Instructions (00165968)     
Major Non-recoverable Fault Occurs with Incorrect Handling of Execution Collision Error (00166070)     
Major Processor Arithmetic Fault     
MAOC Duration and Enable Cam     
MCLM and MCCD Instructions     
MCT Instruction for a Robot     
Merge All Parameter     
Motion Coordinate Linear Move Merge All Generates Error (Lgx00162301)     
Multiple Rotations     
Sequence of Moves Cause Motion Error 69 (Lgx00155408, Lgx00155021)     
Target Position for MCLM and MCCD Instructions     
1756-OB16IEFS Scheduled Output Module Position Incorrect (00173808)     
Absolute Home Sequence Spikes Axis Actual Velocity (Lgx00141749, Lgx00139028)     
Absolute Immediate or Passive Home     
Absolution Position on Motion Axes     
ACCEL and DECEL Motion Status Bits     
Actual Velocity Value for Moving Axis Remains Zero Until Unwind Occurs (00167426)     
Attempts to Uninhibit An Axis Unsuccessful (00169523)     
Autotune Incorrectly Uses Motion Polarity Bit     
Axis Absolute Position Restored to Zero After Power Cycle (00166762)     
Axis Gear Instruction Acceleration Rate Slows Significantly (Lgx00141751, Lgx00138931)     
Axis Home Position Incorrect After NAK Response (00173522)     
Axis Home Status Remains Enabled (Lgx00148425, Lgx00137384)     
Axis Incorrectly Appears to Be Homed (Lgx00155591, Lgx00142201)     
Axis Inhibit Process Not Working as Expected (00173254)     
Axis Likely to Experience Jitter     
Axis Moves in Opposite Direction When Homing (Lgx00148426, Lgx00145161)     
Axis Schedule Changes After Project Import and Download (00169297)     
AxisHomedStatus Bit Cleared Unexpectedly (Lgx00151583, Lgx00146462)     
AxisHomedStatus Bit Gets Set To Zero When Inhibiting the Axis     
AxisHomedStatus Tag Value Lost After Firmware Update (Lgx00151582, Lgx00150904)     
Bus Regulator Action Attribute Set to Incorrect Value (Lgx00105593, Lgx00153674)     
Controller Experiences a Major Fault After a Project Download (00170895)     
Controller Faults When Dwelling Move is Stopped (Lgx00148424, Lgx00144228)     
Drive Fault with Excessive Position     
Drive in Safe-Off State     
Failure to Update Time Offset Corrections in Drives (Lgx00161389, Lgx00161400)     
High Number of Power Sharing Alarms Logged (Lgx00155061, Lgx00156678)     
Incorrect Execution Schedule for Scheduled Output Module (Lgx00157174)     
MAH Instruction Causes Unintended Motion     
MAJ Instruction     
MAOC Drifting Errors     
MAPC instruction     
MAPC Uses Command Position as Master Reference for Feedback Only Axis     
MAPC/MATC Instruction with a Cam Profile Containing NANs Can Cause a MNRF     
MAR and MAW Instructions Do Not Execute Properly After Controller Power Is Cycled     
MAW Instruction Misses Position     
MGS Instruction     
Motion Arm Watch Instruction Can Miss Trigger Position (Lgx00141753, Lgx00136692)     
Motion Instruction Interference Can Prevent Axis From Being Enabled (00175334)     
Motion Run Axis Tuning Instruction Gets Stuck (00172234)     
MRP Instruction     
MRP with Negative and Out of Range Position Value Can Cause Axis Runaway     
Position, Velocity Integrator Bandwidth     
Restore Project from Removable Media     
Soft Overtravel Limits Are Ignored (Lgx00145938, Lgx00143064)     
The Controller Can MNRF if a MAM That Was Already Decelerating Is Merged Into another MAM     
The Controller Can MNRF if a MCLM That Was Already Decelerating Is Merged Into another MCLM     
Tune Torque Low Pass Filter     
Unexpected Velocity Spike With Motion Axis Home or Motion Redefine Position Instruction (Lgx00141752, Lgx00137680)     
Velocity Scaling Not Performed Before SLAT Setpoint Sent To Drive     
Axis Servo Drive Data Type     
CSTLossFault Group Fault Follows a Project Download (Lgx00141746, Lgx00140906)     
Home to Torque Level     
Kinetix 6000 TorqueFeedback and VelocityCommand     
Accept Edits     
Active Reconfigure MSG Instructions     
Arithmetic State Flags     
Attribute Value Incorrect with Get System Value Instruction (00169204)     
Attribute Values Incorrect with Set System Value Instruction (00169713)     
Boolean Arrays in UDTs     
Commutation Offset Attribute Cannot Be Used in Set System Value Instruction (00173090)     
Controller Faults When Alarm Instruction Executes (Lgx00137240, Lgx00136530)     
Dynamic Reconfiguration Fails (00168280)     
Expiration Times On a Logix Repository Record Can Differ (00171229)     
FOR Instruction     
GSV Instructions Do Not Work for Some Attributes (00169204)
Service Incorrectly Allowed With Controller in Run Mode (00175623)     
Set System Variable Instruction Does Not Update Attribute While Online (00177665)     
Subroutine with JSR and SBR     
Unconnected Timeout Time Incorrect (00171872)     
Logix CPU Security Tool     
Action State Indicated Incorrectly (00175645)     
Major Non-recoverable Fault Occurs During Online Editing (Lgx00141747, Lgx00123986)     
Nested Simultaneous Branches     
Online Editing of SFCs     
Sequential Function Chart Executes Incorrectly (00155803)     
Time Limited Actions in Steps     
   Functional Changes 1756-L74
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Behavior Changes in Logix5000 Controllers     
MCS Instruction     
Source and Target Transform Dimensions Must Be Equal in MCT/MCTP Instructions     
Watchdog Attribute for Motion Group Removed     
Motion Coordinated Linear Move Instruction Change to Merge All     
V20 Additional Memory Requirements     
V21 Additional Memory Requirements     
V24 Additional Memory Requirements for Logix5000 Controllers     
V27 Additional Memory Requirements for Logix5000 Controllers     
   Requirements 1756-L74
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26.013
1756-L7 Safety Certification     
Compatible Software for Controller Firmware Revision 29     
Compatible Software for Controller Firmware Revision 31.011     
   Application Notes 1756-L74
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CIP Sync Time Synchronization     
FactoryTalk Alarms and Events Systems That Use ALMA and ALMD Instructions     
Logix Designer Does Not Flash Controller Firmware (Lgx00156630)     
Logix Designer Not Able to Download Project     
New Firmware File Format     
Out of IO Memory Error Reported on Download (Lgx00148858, Lgx00143901)     
   Security 1756-L74
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26.013
CVE-2020-6998: Denial-of-Service Vulnerability That Affects Logix 5000™ Controllers     
Access Denied dialog box does not appear when users without FactoryTalk Security access attempt to modify Motion Configuration (     
CVE-2022-3157: Denial-of-Service Vulnerability That Affects Logix 5000™ Controllers     
Denial of Service_Buffer Overflow     
Denial-of-Service Vulnerability That Affects Logix 5000™ Controllers     
Safe State Values     
System and Device-Level Security