Setup guide

Chapter 3 Driver and Protocol Objects
Object Reference Manual 3-10 www.Automationdirect.com
Allen-Bradley Register Addressing
LookoutDirect has adopted a sequential, flat addressing scheme for the
Allen-Bradley PLCs. The addresses are sequential by data type, having
nothing to do with the actual slot number. For example, consider the
following slot configuration:
You can see from the example, the slot number of the module is irrelevant
to Lookout
Direct
, and the input channels follow consecutive numbers as
the output channels follow their own consecutive numbers.
Allen-Bradley Data Members
Each AB object contains a great deal of data. All readable and writable
members (inputs/outputs) are bundled with the object. As soon as you
create an AB object you immediately have access to all the object data
members.
The AB object classes automatically generate an efficient read/write
blocking scheme based on the inputs and outputs you are using in your
process file. You are not required to build your own I/O blocking table.
However, you can ensure peak performance by organizing your PLC data
into contiguous groups.
PLC slot Location Type of Module in PLC Slot
Channel Address in
LookoutDirect
slot 1 16 channel analog input I:0-I:16
slot 2 16 channel analog output O:0-O:16
slot 3 8 channel input, 8 channel output I:17-I:24, O:17-O:24
slot 4 16 channel analog input I:25-I:32
Table 3-2. AB_PLC2 Data Members
Data Member Type Read Write Description
0 - 7777 numeric yes yes 16-bit signed binary word ranging
from –32,768 to +32,767
0_0 - 7777_17 logical yes no One bit within a 16-bit binary word
CommFail logical yes no Object-generated signal that is ON if,
for any reason, Lookout
Direct
cannot
communicate with the PLC.