Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 40)

Configuring the Scanner through LIST
Chapter 2
2-14
Table 2.C
DH+ Station Numbers for 1775ĆS5, ĆSR5 Modules
If the station address between: The backup scanner module assumes a station
address that is:
00 and 37
8
40
8
higher than the assigned station number
40
8
and 77
8
40
8
lower than the assigned station number
When you do not select backup, you assign a unique DH (000
8
to 376
8
) or
DH+ (00
8
to 77
8
) station number to the scanner module in the primary
processor and the one in the backup processor. The backup continues to
operate with the same station number even after the switchover.
ATTENTION: To guard against personal injury and damage to
equipment, do not assign the same station number to both
scanner modules, if you have not selected backup mode.
If both scanners are assigned the same number and backup is
not selected, two stations with the same station number attempt
to communicate on the link. This can cause unpredictable
machine motion.
5 - Send Unprotected
Select the Send Unprotected option from the configuration screen to
determine if the scanner can send unprotected command messages to other
stations. You use command messages to communicate with other
controllers on a DH or DH+ network. You can use:
an unprotected command to read or write to any area of another station’s
data table
a protected command to write to those areas of another station’s data
table specified by the station that receives the command
If you: Then the scanner can send:
select send unprotected both protected and unprotected commands
do not select send unprotected protected commands only
An asterisk displays in front of this selection to indicate that it is enabled.