[ removed wrong image ]

Which wiring method are you using?
How is the equipment wired now?
Do you have wiring diagram of the problem valve?

fifo92

Hi
I have connected ports of valve 1 to 24V 2 GND 3. to siemens AQ (3)  4. to siemens AQ (3M), your picture is from analog input 

 oooops   that image of the analog input is not helpful. 

A shame that the PDF you shared does not have an electrical connection diagram.

I assume the "GND" you state is the signal ground (0V) and not the chassis ground / earth. I also assume the 24V supply is the same as that of the PLC. Consider connecting the 3M also to signal ground.

Which voltage did you output on the analog output. What does your voltmeter / hand-meter measure? Take PIN2 of the valve connection as reference and measure PIN3.

In my experience, hydraulic valves often require considerably more current than pneumatic valves, and may require a control relay between the PLC less current capable outputs and the valves.

If I have hydraulic valves, I tend to use RELAY digital output modules and make sure the valve connector has surge suppression built in (or it must be added at terminals inside the PLC enclosure, or if possible, an enclosure closer to the valves - preferred). 

fifo92

Everybody do sometime mistake.
Yes i have same power supply for PLC and for valves. Between 2., 3. is 0,0V. From AQ i am sending signal from 0,5V to 4,5V, graph from page 4 is misleading. I have another SM1232 module which i have connected to another 24V supply but it have same ground with PLC.

fifo92

Everybody do sometime mistake.
Yes i have same power supply for PLC and for valves. Between 2., 3. is 0,0V. From AQ i am sending signal from 0,5V to 4,5V, graph from page 4 is misleading. I have another SM1232 module which i have connected to another 24V supply but it have same ground with PLC.

Getting a 0VDC potential between PIN2 and PIN3 is unexpected. The analog voltage should be seen there. How about PIN3 and PIN4? That releases a box of cats with possibilities.

Possibilities are:

1. The analog card is not set for voltage or card is not working.
   Test with something else to make sure analog voltage is there.
   
   
2. Incorrect connection, like analog polarities are incorrectly wired.
   Check with wiring diagram of valve.
   
   
3. The current needed by the valve is too big or valve is defective.
   
   

What do you think?

Please measure the current that flows on the signal side when you have an auxiliary (0V-5V) power source.

Needing an isolated supply and signal does not make sense. What would make sense is that a high current is needed on the signal side. That would mean the valve is power only by electricity and not helped on by the hydraulic pressure. You can ask your supplier about it. Perhaps there is a piping method that bleeds pressure to assist the movement of the valve mechanism.

Another idea is to add an external amplifier circuit. You can build one or purchase one. This would also isolate the PLC analog. The valve since an external power source would be used to drive the output of the amplifier.

Long story short -- you do not have a malfunctioning PLC hardware. The hardware can just not supply enough Watt power to drive the movement of the valve.

What are your thoughts?

fifo92

Hi
I have connected ports of valve 1 to 24V 2 GND 3. to siemens AQ (3)  4. to siemens AQ (3M), your picture is from analog input 

Hold on..
In the last image you have PIN3 as signal ground.
In the PDF sheet, page 7, PIN4 is marked for 5V.

If the PLC analog was connected as you state above, then you have to swap PIN3 and PIN4. I further bet that PIN2 and PIN3 is internally connected --> you measured earlier 0V where an analog value should have been.

fifo92

Pin 2 and 3 aren't internaly connected i tested it with multimeter 

Was PIN4 connected to [+] of the analog?
Or was it connected as you wrote with [+] on PIN3?

What does [+] of the analog measure when the valve is connected?