Rockwell Automation 1734-IE4S POINT Guard I/O Safety Modules User Manual - Manual (Page 70)

70 Rockwell Automation Publication 1734-UM013J-EN-P - July 2014
Chapter 4 Install the Module
Figure 39 - 4-wire Voltage or Tachometer Sensor (SIL 3)
Figure 40 - 4-wire Current Sensor (SIL 3)
Follow the Guidelines for Wiring Safety Analog Inputs on page 65 .
FE FE
V0 V1 V2 V3
I0 I1 I2 I3
COM COM COM COM
COM COM COM COM
S0 S1 S2 S3
S0 S1 S2 S3
This wiring configuration may also be used for SIL 2 redundant Tachometer mode.
Signal Return and Common are at the same potential.
Field sensors are monitoring the same signal in a redundant configuration.
You must configure a safety discrepancy deadband between the two signals to achieve SIL 3.
SIL 2
4-wire
Sensor
1734-TOP3 Terminal Bases
Signal (V)
+24V
Cable Shield
Signal Return
Common
SIL 2
4-wire
Sensor
Signal (V)
+24V
Signal Return
Common
Cable Shield
See Figure 43 and Figure 44 on page 72 for tachometer wiring detail.
FE FE
V0 V1 V2 V3
I0 I1 I2 I3
COM COM COM COM
COM COM COM COM
S0 S1 S2 S3
S0 S1 S2 S3
Signal Return and Common are at the same potential.
Field sensors are monitoring the same signal in a redundant configuration.
You must configure a safety discrepancy deadband between the two signals to achieve SIL 3.
SIL 2
4-wire
Sensor
1734-TOP3 Terminal Bases
Signal (I)
+24V
Cable Shield
Signal Return
Common
SIL 2
4-wire
Sensor
Signal (I)
+24V
Signal Return
Common
Cable Shield