Allen-Bradley SLC 500 Manual page 242

Outputs
Enter the number of Output words up to a maximum of 100 words (200 bytes). The Start Address is
normally set to 0. You can change the Start Address to create an offset address. Different devices can
reference the same Interbus-S address but may require an offset for one of the devices. Changing the
Start Address will change the address ranges shown in the Interbus-S DP Protocol dialog box.
Addressing
Some PLCs use Byte addressing while others use Word addressing. Select Addressing on Byte
Boundaries or Word Boundaries, based on your PLC type. The range of valid addresses will be
displayed in the Interbus-S DP Protocol dialog box, which appears when you close the configuration
dialog box.
Word Storage Format
This option allows selecting the way bytes are arranged into words. Selecting MSB-LSB will arrange
bytes from the MSB (Most Significant Byte) to the LSB (Least Significant Byte). Selecting LSB-MSB
will arrange bytes from the LSB (Least Significant Byte) to the MSB (Most Significant Byte. MSB-
LSB will store the MSB in the current address byte and the LSB will be stored in the next byte. LSB-
MSB is stored in the opposite order.
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-IBS-202 SERIES B
136 • • • • Interbus-S
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