Specifications

3–6 System Installation Recommendations
Publication 1747-6.2
Modification to the SLC 500 Chassis
SLC 500 chassis (1746-A4, -A7, -A10, and -A13) manufactured
before November 1992 have a resistor between the logic ground and
chassis ground. This resistor could be damaged if the wiring
recommendation described within the attention box on the previous
page is not followed. See the figure below for the location of the
resistor. SLC 500 chassis (1746-A4, -A7, -A10, and -A13) with a
manufacture date of November 1992 or later do not have this
resistor.
Resistor
SLC 500 Chassis
1746-P3
Door
Processor
+24 VDC
DC Neut
Not Used
Not Used
SLC Logic Ground
Earth Ground
Chassis
Ground
Chassis
Ground
•
•
DH-485
Port
Determining the Date of the SLC 500 Chassis
The date of the chassis is found within the serial number imprinted
on the chassis nameplate, located on the right side of the chassis.
See the figure below:
CAT
MADE IN U. S. A.
SLC 500
RACK
SER
U
LL
Right Side
A
1746 - A7
SERIAL NO.
A7 -1195A1357
Month
Year

SA
