AB to AD -Memory Types

The
PLC
Guy

Controlling Your World One Contact At A Time

Allen Bradley	Automation Direct	Notes
Remember – AD uses OCTAL addressing
N – Integer	V	Numeric type of the V memory is controlled by and is the responsibility of the user
F – Float
L – Long Integer
T – Timer	T	The same symbol refers to the timer itself or to its Status/Done bit – depending on usage
T.PRE – Timer Preset	K or V	The preset can be a 'program fixed constant' value or the current contents of a chosen V register
T.ACC – Timer accumulator	V or TA	Each timer has a pre-assigned V memory space for its accumulator. This same space can also be addressed using the easily remembered alias.
C – Counter	CT	The same symbol refers to the counter itself or to its Status/Done bit – depending on usage
C.PRE – Counter Preset	K or V	The preset can be a 'program fixed constant' value or the current contents of a chosen V register
C.ACC – Counter accumulator	V or CTA	Each counter has a pre-assigned V memory space for its accumulator. This same space can also be addressed using the easily remembered alias.
S – System Words	V	Refer to 'DL06 System V Memory' in section 4
I – Input	X	These are all 'bit' type
O – Output	Y
B – Control Bit	C
S – System Bits	SP	Refer to Appendix D for usage

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