Specifications

SLC 500 Programmable Controllers and I/O Modules

Blank Worksheet for Selecting 1746 Power Supplies

If you have a multiple chassis system, make copies of the Worksheet for Selecting a Power Supply.

For a detailed list of device load currents, see page 54. Remember to consider future system expansion when selecting a power supply.

Procedure

1. For each slot of the chassis that contains a module, list the slot number, the catalog number of the module, and its 5V and 24V

maximum currents. Also include the power consumption of any peripheral devices that may be connected to the processor other than a

DTAM, HHT, or PIC—the power consumption of these devices is accounted for in the power consumption of the processor.

Chassis Number Maximum Currents Chassis Number Maximum Currents

Slot Number Catalog Number at 5V dc at 24V dc Slot Number Catalog Number at 5V dc at 24V dc

Slot Slot

Peripheral Device Peripheral Device

2. Add the loading currents of all 2. Add the loading currents of all

the system devices at 5 and 24V dc the system devices at 5 and 24V dc

to determine the Total Current. to determine the Total Current.

3. For 1746-P4 power supplies, calculate the total power consumption of all system devices. If you are not using a 1746-P4, go to step 4.

Current Multiply by = Watts Current Multiply by = Watts

Total Current 5V Total Current 5V

at 5V dc at 5V dc

Total Current 24V Total Current 24V

at 24V dc at 24V dc

User Current 24V User Current 24V

at 24V dc at 24V dc

Add the Watts values to determine Total Power Add the Watts values to determine Total Power

(cannot exceed 70 Watts) (cannot exceed 70 Watts)

4. Choose the power supply from the list of catalog numbers shown below. Compare the Total Current required for the chassis with the

Internal Current capacity of the power supplies. Be sure that the Total Current consumption for the chassis is less than the Internal

Current Capacity for the power supply, for both 5V and 24V loads.

Catalog Number Internal Current Capacity Catalog Number Internal Current Capacity

at 5V dc at 24V dc at 5V dc at 24V dc

1746-P1 2.0A 0.46A 1746-P1 2.0A 0.46A

1746-P2 5.0A 0.96A 1746-P2 5.0A 0.96A

1746-P3 3.6A 0.87A 1746-P3 3.6A 0.87A

1746-P4 (see step 3) 10.0A 2.88A 1746-P4 (see step 3) 10.0A 2.88A

1746-P5 5.0A 0.96A 1746-P5 5.0A 0.96A

1746-P6 1746-P6

1746-P7 1746-P7

Required Power Supply Required Power Supply