Rockwell Automation 1771-SPI,D17716.5.122 SPI PROTOCOL INTERFACE - Manual (Page 21)

Important Information That You Need
to Set Up the SPI Network
Chapter 2
2-7
Example Diagram with Primary and Secondary Machine Connections
In the following example, a machine has a junction box (primary machine
connections) to which you may connect up to four devices (secondary
machine connections). Use jumper plugs in the absence of connected devices.
RSĆ485 Data + (terminal A)
1771-WA
Field Wiring Arm
A
O
1
2
3
4
5
6
7
B
Primary Machine Connections
Jumper Plug for Absent Device
Insert jumpers in
unused primary
machine connectors.
120 Ohm
Termination
Resistor
Shield &
Drain
Signal Common and R1 pullup (terminal 1)
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
6
7
8
9
6
7
8
9
6
7
8
9
6
7
8
9
RSĆ485 Data - and R1 pullup (terminal 0)
earth
ground
Not Used (terminal 3)
R2 pullup (terminal 4)
R2 pullup (terminal 5)
Not Used (terminal 6)
Not Used (terminal 7)
Not Used (terminal 8)
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
3
4
5
8
9
1
3
4
5
8
9
Secondary Machine Connections
Mates with a Device
Cable to a Device
Connect cables from
primary machine
connectors to devices.
Connections to the SPI Module
(male)
(male)
SPI Network
Cable
1
2
3
4
5
6
7
8
9
(female)
Belden
9830
Device
such as a dryer,
or temperature
controller
Floating Terminal, Tie Point (terminal 2)
Shield &
Drain
Belden
9830
(male)
(male) (male) (male) (male)