Specifications

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Allen-Bradley DH+/DH-485 Device Driver Help
R<file>:<element>.<field>
Depends on field
The following file numbers and maximum element are allowed for each model.
PLC Model
File Number
Max Element
SLC Family
6, 9-999
999
PLC-5 Family
3-999
1999
The following fields are allowed for each element. Refer to the PLC documentation for the meaning of each field. The
default is shown in bold.
Element Field
Data Type
Access
LEN
Word, Short
Read/Write
POS
Word, Short
Read/Write
FD
Boolean
Read Only
IN
Boolean
Read Only
UL
Boolean
Read Only
ER
Boolean
Read Only
EM
Boolean
Read Only
DN
Boolean
Read Only
EU
Boolean
Read Only
EN
Boolean
Read Only
Example
Description
R6:0.LEN
length field of control 0 file 6
R6:10.DN
done bit of control 10 file 6
R15:18.POS
position field of control 18 file 15
Integer Files
You can access an integer file by specifying a file number, a word and an optional bit in the word. The default data type
for all syntax is shown in bold.
Syntax
Data Type
N<file>:<word>
Short, Word, BCD, DWord, Long, LBCD
N<file>:<word> [rows][cols]
Short, Word, BCD, DWord, Long, LBCD (array types)
N<file>:<word> [cols]
Short, Word, BCD, DWord, Long, LBCD (array types)
N<file>:<word>/<bit>
Boolean
N<file>/bit
Boolean
The number of array elements (in bytes) cannot exceed the block request size specified. This means that array size
cannot exceed 16 words given a block request size of 32 bytes.
The following file numbers and maximum word locations are allowed for each model. The maximum word location is
one less when accessing a 32 bit data type (Long, DWord or Long BCD).
PLC Model
File Number
Max Word
SLC Family
7, 9-999
999
PLC-5 Family
3-999
1999
Example
Description
N7:0
word 0
N7/26
bit 26