Specifications

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Allen-Bradley DH+/DH-485 Device Driver Help
Each device has now been defined under
its own channel. In this new
configuration, a single path of execution
is dedicated to the task of gathering data
from each device. If the application has
16 or fewer devices, it can be optimized
exactly how it is shown here.
The performance will improve even if the
application has more than 16 devices.
While 16 or fewer devices may be ideal,
the application will still benefit from
additional channels. Although by
spreading the device load across all
channels will cause the server to move
from device to device again, it can now
do so with far less devices to process on
a single channel.
Address Descriptions
Address specifications vary depending on the model in use. To obtain specific address information for the model you are
interested in, select the link from the following list.
SLC Family Open Addressing
PLC-5 Family Addressing
General Addressing (for both models)
General Addressing
These general addresses pertain to both the SLC50/5 and PLC-5.
Output Files
Input Files
Status Files
Binary Files
Timer Files
Counter Files
Control Files
Integer Files
Float Files
ASCII Files
String Files
See Also: SLC Family Open Addressing and PLC-5 Family Addressing.
Output Files
The syntax for accessing data in the output file differs depending on the PLC model. Arrays are not supported for output
files. Data locations are read/write for PLC-5 models, read-only for all other models. The default data type for all syntax
is shown in bold.
The syntax for PLC-5 models:
Syntax
Data Type
O:<word>
Short, Word, BCD
O:<word>/<bit>
Boolean
O/bit
Boolean