8 Discrete I/O Modules
Publication 1746-IN005A-US-P
Heat Dissipation
The following tables contain values for the heat dissipated by each I/O module.
Use them to calculate the total amount of heat dissipated by your SLC 500™
control system. For details on how to calculate total heat dissipation, refer to the
SLC 500 Modular Hardware Style Installation and Operation Manual,
publication 1747-6.2. Please note the following definitions:
• Watts per Point - the heat dissipation that can occur in each field wiring
point when energized at nominal voltage.
• Minimum Watts - the amount of heat dissipation that can occur when there
is no field power present.
• Total Watts - the watts per point multiplied by the number of points, plus the
minimum watts (with all points energized).
Table 2: Input Module Heat Dissipation
Catalog Numbers Watts per Point Minimum Watts Total Watts
1747-IA4 0.27 0.175 1.30
1746-IA8 0.27 0.250 2.40
1746-IA16 0.27 0.425 4.80
1746-IB8 0.20 0.250 1.90
1746-IB16 0.20 0.425 3.60
1746-IC16 0.22 0.425 3.95
1746-IG16 0.02 0.700 1.00
1746-IH16 0.32 0.217 5.17
1746-IM4 0.35 0.175 1.60
1746-IM8 0.35 0.250 3.10
1746-IM16 0.35 0.425 6.00
1746-IN16 0.35 0.425 6.00
1746-ITB16 0.20 0.425 3.60
1746-ITV16 0.20 0.425 3.60
1746-IV8 0.20 0.250 1.90
1746-IV16 0.20 0.425 3.60
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