Specifications

Allen-Bradley DH+ Driver Help

SLC Family Open Addressing

Open Addressing

The actual number of addresses available depends on the model of the PLC being used. The ranges have been

opened up to allow for maximum flexibility with future models. If the driver finds at Runtime that an address is

not present in the device, it will post an error message and remove the tag from its scan list.

Note: This model has no model specific addressing.

See Also: General Addressing

PLC-5 Family Addressing

General Addressing

Model Specific Addressing

BCD Files

PID Files

Message Files

Block Transfer Files

SC Files

BCD Files

To access data in a BCD file, specify a file number and a word. The only data types allowed are BCD and Long

BCD. The default data type is always BCD.

Syntax Data Type

D<file>:<word> BCD, LBCD, Boolean

D<file>:<word> [rows][cols] BCD, LBCD*

D<file>:<word> [cols] BCD, LBCD*

*Array types.

The number of array elements (in bytes) cannot exceed the block request size specified. This means that array

size cannot exceed 16 BCDs given a block request size of 32 bytes. For more information, refer to

Communications Parameters.

The following file numbers and maximum word locations are allowed for each model.

PLC Model File Number Max Word

SLC 5/05 Open NA NA

PLC-5 Family 3-999 999

Example Description

D9:0 Word 0.

D8:9/10 File 8 BCD element 9 (bit 10).

D27:10 [16] 16 element array starting at word 10.

D15:0 [4] [8] 32 element array starting at word 0.

PID Files

PID files are a structured type whose data is accessed by specifying a file number, an element and a field. The

default data type depends on the field being accessed. Integer fields receive a default data type of Word.

Syntax Data Type

PD<file>:<element>.<field> Depends on field

The following file numbers and maximum element are allowed for each model.

PLC Model File Number Max Element