Does the PLC relay output have input restrictions? How much is the output frequency?
Due to different PLC and out of the output terminal level jump frequency is not the same, you can calculate their own according to the program execution cycle. Each PLC has an address that monitors the maximum execution cycle of the PLC.
PLC relay output, the frequency is usually best not to exceed 1Hz, some instructions that can reach 0.1Hz, it is not a long time.
As for input? If you refer to the load of the relay, it is AC and DC universal, AC voltage should not exceed 240V Under normal circumstances is allowed, DC, then use 48V in the vast majority of occasions enough. And the current will look at the species, and usually do not exceed 1A is better, some instructions that can reach 5A or even 10A, because the arc relationship is still not a long-term plan. Especially if you want high-frequency output, the current is still smaller.
If you are referring to the relay type output of the PLC switch input section, then it is still the most common use of DC 24V.
