Allen-Bradley 1734-OB8S - Example 2: POINT Guard I;O Used with 1734-EP24 DC for Input and Output, Plus AC I;O

62 Rockwell Automation Publication 1734-UM013C-EN-P - August 2010
Chapter 5 Power Supply Examples
Example 2: POINT Guard I/O Used with 1734-EP24DC for Input and
Output, Plus AC I/O
This power supply example uses a 1734-EP24DC input and output with these
properties:
• Group 1 and Group 3 I/O have separate functioning groups of I/O,
compared to Group 2.
• Field power for Group 2 outputs is on the same supply as bus
communication (Supply 2 loss causes broken connections to the
controller).
• Field power for Group 2 inputs is on the same supply as bus
communication (Supply 2 loss causes broken connections to the
controller).
1734-AENT
5V
24V
Standard I/O Standard I/O Standard I/O Standard I/O Standard I/O
1734-EP24AC
1734-OB8S 1734-IB8S 1734-OB8S
24V Supply for
Standard I/O Modules
120V AC Supply for
Additional I/O
Modules (optional)
24V Supply for Safety
Inputs and Outputs
5V
5V
120V
AC
24V
Standard I/O Standard I/O Standard I/O Standard I/O
1734-EP24DC
1734-IB8S
Group 1
Group 2 Group 3
Supply 1 Supply 2
Supply 3