Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 - Manual (Page 34)

Installing a Backup System
Chapter 2
2-19
If you designate another I/O channel for use as a peer-to-peer
communication channel, replace the references to I/O channel 1 with the
actual I/O channel used in the following procedure.
1. Connect one end of a cat. no. 1770-CD twinaxial cable to the I/O
channel 1 terminals on the terminal swing arm of a scanner module in
the backup processor. If this is a 1775-S4A or 1775-SR scanner
module, do not connect the shield.
For 1775-S4A and 1775-SR scanner modules, install a cat. no.
1770-XT terminator to the I/O channel 1 terminals in the backup
processor as shown in Figure 2.15. For 1775-S5 and 1775-SR5
scanner modules, you can either install a 1770-XT terminator or
select a terminator by using the internal switches as shown in
Figure 2.17 on page 2-23.
Important: If the internal terminator option is used, the link will be
unterminated if the swing arm is removed from the scanner.
2. Connect the other end of the 1770-CD twinaxial cable to the I/O
channel 1 terminals on the terminal swing arm of the corresponding
scanner module in the primary processor. Connect the shield.
3. Connect one end of another 1770-CD twinaxial cable to the I/O
channel 1 terminals on the terminal swing arm of the scanner module
in the primary processor. Connect the shield.
4. Connect the other end of this 1770-CD twinaxial cable to the
designated peer-to-peer channel in another processor. If this is a
1775-S4A or 1775-SR scanner module, do not connect the shield.
5. Connect one end of another 1770-CD twinaxial cable to the I/O
channel 1 terminals on the terminal swing arm of this scanner
module. Connect the shield.
6. Connect the other end of this 1770-CD twinaxial cable to the
designated peer-to-peer channel in another processor. If this is a
1775-S4A or 1775-SR scanner module, do not connect the shield.
7. Repeat steps 5 and 6 for up to 6 slaves and 1 master.