Specifications

F–6 Calculating Heat Dissipation for the SLC 500 Control System
Publication 1747-6.2
If your controller consisted of the following hardware components,
you would calculate heat dissipation as shown in the worksheet on
page F–7.
Chassis 1 Chassis 2
Slot 0 1 2 3 Slot 4 5 6 7
Peripheral Device
DTAM
User Power
To Peripheral
The following table details the total watts dissipated by the modules
and peripheral devices in the above SLC 500 controller.
Chassis 1 Chassis 2
Slot Number
Catalog
Number
Min. Watts Total Watts Slot Number
Catalog
Number
Min. Watts Total Watts
0 1747-L511 1.75 1.75 4 1746-IA16 .425 4.8
1 1746-BAS 3.75 3.8 5 1746-IA16 .425 4.8
2 1746-IA8 .250 2.4 6 1746-OW16 5.17
5.5
➀
3 1746-OV8 .675 6.9 7 1746-OW16 5.17 5.7
Peripheral
Device
1747-DTAM 2.5 2.5 NA NA NA NA
User Power to
Peripheral
NA NA NA NA NA
2.4
➁
NA
➀
This output card uses 5.5 watts because only 10 points are on at any one time. Using the
calculated watts formula — (number of points energized x watts per point) + minimum watts =
heat dissipation of module — the calculated watts for the 1746-OW16 module is 5.5W
: (10 points
X .033) + 5.17 = 5.5W .
➁
The user power on the 1746-P1 power supply for Chassis 2 is being used to power a peripheral
(100 mA at 24 VDC).
NA (Not Applicable)
Example Heat Dissipation
Calculation