Rockwell Automation 1794 FLEX I/O System with ControlLogix for SIL2 - Manual (Page 31)

Publication 1794-RM001G-EN-P - December 2011
FLEX I/O Modules 3-9
Wiring FLEX I/O Analog
Input Modules The wiring diagrams in show two methods of wiring the analog input
Module. In either case, users must determine whether the use of 1 or 2
sensors is appropriate to fulfill SIL2 requirements.
Figure 3.8 ControlLogix Analog Input Module Wiring
Wiring the Single-Ended Input Module in Voltage Mode
In addition to following the General Considerations when using Any FLEX
I/O Analog Input Module on page 3-7, make sure you use the correct
documentation (listed in Table 1.1 on page 1-5) to wire the module.
Figure 3.9 FLEX I/O Analog Input Module Wiring in Voltage Mode
Input 1 Input 2
Input
COM
+24V
Input
COM
+24V
Input 1 Input 2
SIL2 SENSOR
SENSOR
43366A
One-Sensor Wiring Example
Two-Sensor Wiring Example
SENSOR
Note 1: Both sensors are monitoring the same safety application.
1
1
Voltage
Transmitter A
1794-TB3
1794-TB3
1794-TB3 1794-TB3
Analog Input
1794-IE8
Analog Input
1794-IE8
Analog Input
1794-IF4I
Analog Input
1794-IF4I
Voltage
Transmitter A
Voltage
Transmitter B
Voltage
Transmitter B
+ - + -
+ - + -