Table of Contents
Advertisement
Considerations When Wiring
This section provides guidelines on wiring the system, grounding the
cables, determining cable length.
ATTENTION: Before wiring the module, disconnect
SLC system power, I/O rack power, and module power.
System Wiring Guidelines
Use the following guidelines in planning the system wiring to the module:
analog common terminals (ANL COM) are electrically interconnected
inside the module, but not internally connected to earth.
voltages on IN+ and IN– terminals must be within 0 to 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 FIO4V are referenced to
ANL COM. Load resistance (R1) for a voltage output channel must
be equal to or greater than 1K ohms.
current output channels (OUT 0 and OUT 1) of the FIO4I source current
that returns to ANL COM. Load resistance (R1) for a current output
channel must be within 0 to 500 ohms.
input connections for single–ended or differential input are the same.
Grounding the Cable
Signal cable such as Belden cable #8761 (or equivalent) has two signal
wires (black and clear), one drain wire and a foil shield (Figure 2.2).
The drain wire and foil shield must be grounded at only one end of the
cable, not at both ends.
Figure 2.2
Typical Signal Cable
Shrink Wrap
Insulation
Clear Wire
Important: Ground the cable shield at one end having a good earth-
ground connection, such as at an I/O chassis mounting bolt or nearest
ground bus in the I/O enclosure. Make this connection as short as possible.
Do not ground the cable at the module's terminal block.
Chapter 2
Installing and Wiring Modules
Foil Shield
Black Wire
Drain Wire
2–5
Advertisement
Table of Contents
