Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 65)

Publication 1747-UM011G-EN-P - June 2008
System Installation Recommendations 65
IMPORTANT
SLC 500 series A chassis (1746-A4, 1746-A7, 1746-A10, and
1746-A13) manufactured before November 1992 have a resistor
between the logic ground and chassis ground as the drawing on
the following page illustrates. This resistor could be damaged if
the wiring recommendation described within the attention box
above is not followed. See the figure on the following page for
the location of the resistor. SLC 500 series A chassis (1746-A4,
1746-A7, 1746-A10, and 1746-A13) with a manufacture date of
November 1992 or later do not have this resistor. SLC 500
series B chassis have a 1 MW resistor that limits the current
between logic ground and chassis ground.
SLC Chassis
1746-P3
Functional Ground
Not Used
Not Used
+24V dc
DC Neut
Chassis
Ground
Safety Ground
Controller Logic Ground
Functional Ground