Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules Installation Instructions - Manual (Page 13)

SLC™ 500 4-Channel Analog I/O Modules 13
Publication 1746-IN008C-EN-P - May 2004
System Wiring Guidelines
Use the following guidelines in planning the system wiring for the analog modules:
•
all analog common terminals (ANL COM) are electrically connected inside
the module. ANL COM is not connected to earth ground inside the module.
•
voltages on IN+ and IN- terminals must remain within ± 20 Volts with
respect to ANL COM to ensure proper input channel operation. This is true
for current and voltage input channel operation.
•
voltage outputs (OUT 0 and OUT 1) of the NIO4V and NO4V are referenced
to ANL COM. Load resistance (R1) for a voltage output channel must be
greater than or equal to 1K ohms.
•
current output channels (OUT 0 and OUT 1) of the NIO4I and NO4I source
current that returns to ANL COM. Load resistance (R1) for a current output
channel must remain between 0 and 500 ohms.
After the analog input module is properly installed in the chassis, follow the wiring
procedure below using Belden 8761 cable.
Grounding Your Cable
Belden cable #8761 has two signal wires (black and clear), one drain wire and a foil
shield. Refer to illustration on page 14 for Belden cable #8761. The drain wire and
foil shield must be grounded at one end of the cable. Do not earth ground the drain
wire and foil shield at both ends of the cable.
Input Channel - Use a chassis mounting tab as a ground for the drain wire and foil
shield.
Output Channel - Ground the drain wire and foil shield at the analog load.
ATTENTION
Care should be taken to avoid connecting a voltage source
without a current transmitter, etc. to a channel configured for
current input. Improper module operation or damage to the
module can occur.
IMPORTANT
If you cannot ground the output channel at the load, ground
the drain wire and foil shield at the chassis mounting tab. Do
not connect the foil shield or drain wire to the analog terminal
block. They must be connected to an earth ground, which is
not provided at the analog module.
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