Rockwell Automation 1746-NO8V SLC 500 8-Point Analog Output Module/ User Manual - Manual (Page 17)

Publication 1746-UM026A-EN-P - September 2003
Installation and Wiring 2-9
Wiring the Module To wire the terminal block, you need:
•
cross-head and flat-blade screwdrivers
•
Belden 8761 (shielded, twisted pair) cable or equivalent
Each terminal may hold up to two 14 gauge leads.
Wiring Guidelines
Before wiring the terminal block, take some time to plan your system:
•
Ensure that the SLC 500 system is installed in a NEMA-rated
enclosure and that the SLC 500 system is properly grounded.
•
Ensure that the load resistance for a current output channel is
less than 500 ohms.
•
Ensure that the load resistance for a voltage output channel is
greater than 1k ohms.
•
Route the field wiring away from any other wiring and as far as
possible from sources of electrical noise, such as motors,
transformers, contactors, and ac devices. As a general rule, allow
at least 15 cm (6 in.) of separation for every 120V of ac power.
•
Use Belden cable #8761 for wiring the analog modules making
sure that the drain wire and foil shield are properly earth
grounded.
•
Route the Belden cable separate from any high-voltage I/O
wiring. Additional noise immunity can be obtained by routing
the cables in grounded conduit.
•
If the field wiring must cross ac or power cables, ensure that
they cross at right angles.
•
All analog common terminals (ANL COM) are electrically
connected inside the module. ANL COM is not connected to
earth ground inside the module.
ATTENTION
!
POSSIBLE EQUIPMENT OPERATION
Before wiring your module, always disconnect
power from the SLC 500 system and from any other
source to the module.
Failure to observe this precaution can cause
unintended equipment operation and damage.