Is it possible to control relay FY-T734-230VAC from the link below with arduino directly?
I want to controll 220V AC devices.
As far as I can understand, these are compatible with PLC, not Arduino.
Yes but not directly. It appears the relay coils are 24V DC. You can use one of many parts as an interface such as a ULN2003, ULN2803, and many others but do not connect directly to your Arduino, it will become a crispy critter. There are also relay modules you could use that have a transistor or MOSFET to switch the relay. Many have had problems with these because of the inexpensive parts used. They also make Solid State Relays that will do what you want as either switching your load or controlling your relays.
The page that you linked to shows four variants with different supply voltages.
The last few digits of the part number is the supply voltage.
- FY-T734-5VDC
- FY-T734-12VACDC
- FY-T734-24VACDC
- FY-T734-230VAC
For use with an Arduino directly you would need the 5V version: FY-T734-5VDC.
Unfortunately the specifications do not mention the current that the 5V relay coil requires. You may need to switch them using a transistor or MOSFET if the current drawn is above the limit for an Arduino pin.
You definitely would not want the variant mentioned in the title of this topic - it requires 230VAC to switch the relays.
Note that in the diagram you posted in #1, there's an NPN and a PNP version shown. Which will you use?
Note also that in that diagram, an input signal of 24V is assumed. You'd have to have an external 24V source that you switch with e.g. a small signal MOSFET from your Arduino.
If I search for FY-T734 I find a plethora of relay modules, all with different interfaces and drive voltages. A lot depends on which version you will use in particular.
If you're in the market for a new relay module, get one that's designed to work with microcontroller projects. You're now looking for PLC-environment relay modules. In principle these can be used with an Arduino, but may require additional interfacing as indicated above.
That's pretty much useless.
I saw that table on the link and quiet frankly didn't believe it.
That table does not say what voltage it refers to.
The same table is presented for whichever variant you select.
A 24V relay won't take as much current as a 5V relay.
By close inspection of the photographs, I could read the part numbers of the relays on the 24V and 12 V variants.
They were MPSA-S-124-C for the 24V, and MPSA-S112-C for the 12V version.
I then looked for the MPA Series - Relay Datasheet.
From the Manufacturer's Webpage:
The 5V relay has a coil resistance of 70Ω.
It will draw a current of around 72mA.
You will be able to use the 5V relay module with an Arduino, but you won't be able to switch the relay directly from an Arduino output pin.
You will need a transistor or MOSFET for each relay, to switch the 72mA current.
I do, because it's the signal current for the relay module. I don't really see the sense in trying to control relays direct if they're on a board that already has the drivers. In that case just skip these boards and get some bare relays.
There is only one variant for each voltage.
The 12V and 24V versions have a bridge rectifier fitted making them suitable for AC or DC.
It is this feature that enables then to be wired to NPN or PNP drivers.
Not so sure about that; Google turns up a wide range of variants. In any case, I note that the discussion goes off in all kinds of directions because it's not clear which specific module OP intends to use - nor what is requirements are.
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