PLC Allen Bradley Addressing File Types

Addressing File Types

The table below shows the file types and the amount of memory used by each.

File Type	File-Type Identifier	File Number	Maximum Size of File 16 bit words and structure				Memory Used in Overhead for each File (in 16 bit words)	Memory Used (in 16 bit words) per Word, Character, or Structure
			PLC 5/11, 5/20, 5/20E	PLC 5/30	PLC 5/40, 5/40E, 5/40L	PLC 5/60, 5/60L, 5/80, 5/80E
Output image	O	0	32	64	128	192	6	1/word
Input image	I	1	32	64	128	192	6	1/word
Status	S	2	128	128	128	128	6	1/word
Bit (binary)	B	3 *	1000 words				6	1/word
Timer	T	4 *	3000 words / 1000 words				6	3/structure
Counter	C	5 *	3000 words / 1000 words				6	3/structure
Control	R	6 *	3000 words / 1000 words				6	3/structure
Integer	N	7 *	1000 words				6	1/word
Floating	F	8 *	2000 words / 1000 words				6	2/structure
ASCII	A	3-999 **	1000 words				6	½ per character
BCD	D	3-999 **	1000 words				6	1/word
Block-transfer	BT	3-999 **	6000 words / 1000 words				6	6/structure
Message	MG	3-999 **	32760 words / 585 structures ***				6	56/structure
PID	PD	3-999 **	32718 words / 399 structures ***				6	82/structure
SFC Status	SC	3-999 **	3000 words / 1000 structures				6	3/structure
ASCII String	ST	3-999 **	32769 words / 780 structures				6	42/structure
Unused	--	9-999	6				6	0

· * This the default file number and type

· ** These files contain only the number of words corresponding to the highest address that you assign

· *** The maximum size of a single data table file is 32K words

The maximum size of the entire data table is 64K words

Valid Data Types/Values

Data Type:	Accepts any:
Integer	Integer data type: integer, timer, counter, status, bit, output, ASCII, BCD, control (e.g. N7:0, C4:0 etc)
Float	Floating point data type (valid range is +/- 1.175494e-38 to +/- 3.402838e+38)
Block	Block transfer data type (e.g. BT14:0) or integer data type (e.g. N7:0)
Message	Message data type (e.g. MG15:0) or integer data type (e.g. N7:0)
PID	PID data type (e.g. PD16:0) or integer data type (e.g. N7:0)
String	String data type (e.g. ST12:0)
SFC Status	SFC status data type (e.g. SC17:0)