Allen-Bradley 1756-L6 Series, Reference Manual, Page: 57 / 134

Rockwell Automation Publication 1756-RM001I-EN-P - May 2012 57
ControlLogix I/O Modules Chapter 5
Wiring ControlLogix Analog Output Modules
In general, good design practice dictates that each analog output must be wired to
a separate input terminal to make sure that the output is functioning properly.
Wiring the Analog Output Module in Voltage Mode
Make sure you:
• review the considerations in Wiring ControlLogix Analog Output
Modules on page 57 .
• Use the correct documentation (listed in Additional Resources on
page 10 ) to wire the module.
Figure 28 shows how to wire the 1756-OF8 module for use in Voltage mode.
Figure 28 - ControlLogix Analog Output Module Wiring in Voltage Mode
Wiring the Analog Output Module in Current Mode
Make sure you:
• review the considerations in Wiring ControlLogix Analog Output
Modules on page 57 .
• use the correct documentation (listed in Additional Resources on page 10 )
to wire the module.
• place devices correctly in the current loop. You can locate other devices in
an output channel’s current loop anywhere as long as the current source can
provide sufficient voltage to accommodate all of the voltage drops (each
module output is 250
Ω
).
Figure 29 on page 58 shows how to wire the 1756-OF8 module for use in
Current mode.
Actuator
43377
(+)
(–)
(+)
(–)
Analog Output Module Analog Input Module
This normally-open relay is controlled by
the status of the rest of the ControlLogix
system. If a short-circuit or fault occurs on
the module, the relay can disconnect
power to the module. The module used to
control this relay must follow SIL 2 output
guidelines. This module also must be
considered during PFD analysis for each
safety function.
The relay used should be a signal-grade
relay using bifurcated or similar grade
contacts. The relay can be located in a
position to remove power to a single
actuator, or can remove power to multiple
actuators depending on the granularity
needed.
Secondary
Output
Allen-Bradley Motors