6 SLC 500™ RTD/Resistance Input Module
Publication 1746-IN012B-EN-P - May 2001
Fixed Expansion Chassis Considerations
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,
publication 1746-6.7.
Invalid Combinations Using the RTD
Module in a Fixed Expansion Chassis
5V dc (Amps) 24V dc (Amps)
OW16 0.170 0.180
OB32 0.452 -
OB32 0.452 -
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