Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 15)

Scanner Hardware and Installation
Chapter 1
1-6
Before you install the scanner, you need to configure the module. You use
the connectors, terminal arm, and switches when:
setting the thumbwheel and switches
installing the scanner
We describe these connections and configurations in the
following sections.
Setting the Thumbwheel and Switches
Before inserting the scanner into a chassis:
1. Set the thumbwheel switch to a unique number (1 to 15) to enable the
processor to distinguish one scanner from another. You must have a
scanner with the thumbwheel set for 1.
2. Make the necessary switch settings.
Figure 1.3 shows the location of the backup switches for the 1775-S5 and
1775-SR5 scanner moduels.
Figure 1.3
Location of Backup Switches for 1775ĆS5 and ĆSR5 Scanner Modules
Terminator switch at
bottom edge of module
Backup switch at
bottom edge of module
18754
Setting a Terminator on a Communication Channel
On the bottom edge near the front of the scanner is a set of four switches.
With these switches, you can connect a terminator across the line when the
scanner is an end device on a DH, DH+, I/O, peer-to-peer, or backup
communication link (Figure 1.4) on the corresponding channel.
Important : When using internal terminators, removing the terminal swing
arm from the scanner causes the communication channels to be
unterminated. You may want to leave the switch up and install the optional
1770-XT external 150 ohm terminator.
Configuring the Scanner
Hardware