Rockwell Automation 1746-NR8 SLC 500 RTD/Resistance Input Module/ Instructions - Manual (Page 8)

8 SLC 500™ RTD/Resistance Input Module
Publication 1746-IN007C-EN-P - December 2002
Modular Chassis Considerations
Place your RTD module in any slot of an SLC 500 modular chassis (except slot 0) or
a modular expansion chassis. Slot 0 is reserved for the modular processor or
adapter module.
Fixed Expansion Chassis Considerations
For a complete listing of valid combinations using the RTD module in a 2-slot
expansion chassis with another SLC I/O or communication module, refer to the
table in the SLC 500 RTD/Resistance Input Module User Manual, publication
number 1746-UM003.
General Considerations
Most applications require installation in an industrial enclosure to reduce the effects
of electrical interference. RTD inputs are susceptible to electrical noises due to the
small amplitudes of their signal.
Group your modules to minimize adverse effects from radiated electrical noise and
heat. Consider the following conditions when selecting a slot for the RTD module.
Position the module:
•
in a slot away from power lines, load lines and other sources of electrical
noise such as hard-contact switches, relays, and AC motor drives
•
away from modules which generate significant radiated heat, such as the
32-point I/O modules
IMPORTANT
The 2-slot, SLC 500 fixed I/O expansion chassis (1746-A2)
supports many combinations of modules. The combinations
that are not supported by the fixed expansion chassis are
shown in the table below. For a complete listing of valid
combinations using the RTD module in a 2-slot expansion
chassis with another SLC I/O or communication module, refer
to the table in the SLC 500™ RTD/Resistance Input Module
User Manual.