Catalogs > Automation Systems Catalog > Programmable Controllers > SLC 500 System > Power Supplies
Power Supplies
1746 Power Supplies
SLC 500 modular systems provide separate power supplies which must be mounted directly on the left end of the 1746 I/O chassis. Seven power supplies are available to meet your system power requirements: three AC -input power supplies and four dc-input power supplies.
Each chassis requires a power supply (which connects to the chassis without a separate cable) to provide power to the processor and each I/O slot. Consider future system expansion when selecting a power supply. Power supply features and benefits include:
- All power supplies have an LED that indicates proper supply power; monitoring this LED can tell you at a glance whether your supply is operating properly.
- Supplies have a hold-up time (the time the system is operational during a brief power loss) typically between 20 milliseconds and 3 seconds; power supplies are designed to withstand brief power losses without affecting the operation of the system. Actual duration of the power supply hold-up time depends on the number, type, and state of the I/O modules.
- On AC power supplies, you can select either 120V or 240V operation by setting a jumper; no special wiring is required.