Allen-Bradley SLC 500 Manual page 156

Double Word Storage Format
This option allows selecting the way words are arranged into double words. Selecting MSW-LSW will
arrange words from the MSW (Most Significant Word) to the LSW (Least Significant Word). Selecting
LSW-MSW will arrange words from the LSW (Least Significant Word) to the MSW (Most Significant
Word). MSW-LSW will store the MSW in the current address word and the LSW will be stored in the
next word. LSW-MSW is stored in the opposite order.
Power On State
A Series B module contains a Battery Backup RAM circuit that maintains a copy of the inputs. The
input states can be restored (Restore Inputs) or cleared (Clear Inputs) when power is applied.
Note: ONLY Series B modules contain the Battery Backup RAM circuit. Series B modules can be
identified by the model number on the product label. Example: MODEL: QPI-PBS-202 SERIES B
Example 1:
In this configuration example, Input Words are set to 64, Output Words are set to 64 and Addressing is
set to Word Boundaries.
When the OK button is clicked, the following Profibus DP Protocol dialog box will appear. The valid
address ranges are shown for all types of variables.
Profibus • • • • 187
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