847H-DL2A-AG00500 A-B Central unit
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IN STOCK847H-DL2A-AG00500 A-B Central unit
The power supply hold-up time that is described previously is longer than the turn-on and turn-off times of the inputs. Because of this, the input state change from On to Off that occurs when power is removed could be recorded by the processor before the power supply shuts down the system. Understanding this concept is important. The user program should be written to take this effect into account.
Other Types of Line Conditions Occasionally the power source to the system can be temporarily interrupted. It is also possible that the voltage level drops substantially below the normal line voltage range for a period of time. Both of these conditions are considered to be a loss of power for the system.
For most applications, normal convective cooling keeps the controller within the specified operating range. Confirm that the specified temperature range is maintained. Proper spacing of components within an enclosure is usually sufficient for heat dissipation.
Place the main power disconnect switch where operators and maintenance personnel have quick and easy access to it. If you mount a disconnect switch inside the controller enclosure, place the switch operating handle on the outside of the enclosure, so that you can disconnect power without opening the enclosure. Whenever any of the emergency stop switches are opened, power to input and output devices should be removed. When you use the master control relay to remove power from the external I/O circuits, power continues to be provided to the controller’s power supply so that diagnostic indicators on the processor can still be observed. The master control relay is not a substitute for a disconnect to the controller. It is intended for any situation where the operator must quickly de-energize I/O devices only. When inspecting or installing terminal connections, replacing output fuses, or working on equipment within the enclosure, use the disconnect to shut off power to the rest of the system
The structure and details of the product：
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