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- PMUX option
- Engine model - rating, N1 trim
- Hardware configuration - 5B, 5B/P - Combustor type - SAC/DAC
- Configuration - EGT monitoring - System configuration
Each ECU channel reads the state of the discretes only at power up initialization and not during an external reset. Once read, the information is held in reserved RAM.
On ground, the reserved RAM values are compared with NVM. If they are different, and the reserved RAM values are valid, the RAM values are stored into NVM. If the reserved RAM values are not valid, the NVM values will not be overwritten. The information is coded in such a way that the total number of closed discretes for a particular configuration is odd, in order for the ECU to check the information for correct parity (odd).
Short circuit faults cannot be detected unless the parity is affected.
Typical fault message.  J14, ECU (ENG IDENT)

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 16
Nov 02
  
 
  CFM56-5B TRAINING MANUAL
 

 
CTC-231-025-00 ID PLUG  
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION  FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 17
Nov 02
   
 
  CFM56-5B TRAINING MANUAL

 
INPUT SELECTION
Cross channel validation.
Validated input signals and validation status data are transmitted from one channel of the ECU to the other. This cross channel data is then available for use in
the data selection process. Data is transferred between channels A and B, via a set of discrete digital signals and two unidirectional databuses.
If the local channel digital data is invalid, or fails a maximum/minimum range check, then that channel uses the opposite channel’s data, through the CCDL, provided that the data has passed validity and range checks. The validation status also indicates if cross channel data is unavailable.
If the parameters value fails the validation and max/min range checks on both channels, then the ECU selects either a failsafe value or, for certain parameters, a model value.
 
A failsafe value is one that has been predetermined and stored in the ECU memory. There are 2 failsafe values that can be selected : failsafe 1 and failsafe 2.
Failsafe 1 is a predetermined minimum, or maximum value. Failsafe 2 is a predetermined fixed value.
A model is a value which is mathematically calculated by the ECU from other parameter values.
 

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 18
Nov 02
　
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