Hello,

I'm migrating an old machine that has an old incremental encoder from a defunct company to a new system that consist of an S7-1214c PLC to use the built-in HSC inputs to read the encoder pulses.

But the problem came when i measured the voltage output from the signal line of the encoder with a multimeter which showed that the pulse train is 5VDC.

Now i need to adapt this signal to 24VDC to use it with the HSC input on the PLC but i'm lost a bit because i've never tried something like this before therefore i'm here asking for advice

I measured the pulses frequency of the signal line when the machine was running and the encoder gave a steady rate of around 100Hz, so my first reaction was using a solid-state relay since the frequency isn't that high and some solid-state relays have higher switching frequency than this;

So would buying a solid-state relay like TOS 5VDC/48VDC 0,1A work?

It's an optocoupler with a rated control voltage of 5VDC and a max switching frequency of 3000Hz and the rated switching voltage on the load side is 5-48VDC.

Any input would be appreciated, thank you for your time!

Best regards,

safar 

You could use the SBV1221 DI 4x5V DC, 200 kHz input signal board for the S7-1200 CPU. The order number is 6ES7221-3AD30-0XB0. The inputs on this signal board can be used as the input to the HSC on the CPU.

Just a suggestion.

Larry

LarryAm

You could use the SBV1221 DI 4x5V DC, 200 kHz input signal board for the S7-1200 CPU. The order number is 6ES7221-3AD30-0XB0. The inputs on this signal board can be used as the input to the HSC on the CPU.

Just a suggestion.

Larry

 According to the manual, it states that the SM 1221 board is a sourcing device, but my encoder is also a sourcing device, i forgot to mention that it's a 5pin encoder (Inputs: PE, 24VDC, GND; Outputs: 2 signal lines), the encoder delivers 5volts on the signal lines when measured; besides the fact that i don't need to buy a 5volts power supply just for the signal board, wouldn't the solid state relay i mentioned earlier work just fine? (see attached picture) 

hello,

why not use optocouplers?

It's much cheaper...

https://benl.rs-online.com/web/p/optocouplers/9054277?cm_mmc=BE-PLA-DS3A-_-google-_-CSS_BE_NL_Relays_Whoop-_-(BE:Whoop!)+Optocouplers-_-9054277&matchtype=&pla-342964170681&gclid=CjwKCAiAvOeQBhBkEiwAxutUVOi-r6psPzZIfih4kEPNR6I6OBB-pHmdl0hrgX0nYUR5OZ-JizHpmBoCtZMQAvD_BwE&gclsrc=aw.ds