@jaroslav_sobota
Yes exactly. I just need anything to notify the operator directly on the machine about current pressure , and let him adjust this one pressure setpoint variable. It could even be a segment lcd.

So we got most of the leaking solved, time came to code the auto cycle.
While coding manal valve closing/openings on button presses was easy, this is where i began to struggle.
I followed a guide which was based on a TwinCat 3, but obviously things are different between IDE's.
What i would like to know is to how to properly init and call a simple timer and r_trig function block in mervis. Does it have to be manually added into the main.fbd, then called properly from main.st for example? Or can i just declare it in .st which would seem more convenient for me.

VAR
// timers
fbStartautotimer:TON;
// triggers
    fbAutoInit_RTRIG:R_TRIG;
    fbAutoOff_RTRIG:R_TRIG;
    fbCycle_RTRIG:R_TRIG;
    fbZeropos_RTRIG:R_TRIG;
END_VAR

Also im not sure if the code below will work even if I call the function blocks properly.

// auto cycle

// button mapping
hw.$Neuron M203_DI2.10$:= bManualMode;
hw.$Neuron M203_DI2.11$:= bAutoMode;
hw.$Neuron M203_DI2.12$:= bAutoEjectorMode;
// pressure setpoint and scaling
iPressure:= REAL_TO_INT(hw.$Neuron M203_AI1.01$);
iPressure_setpoint:= 200;
fbAutoInit_RTRIG(clk:=bAutoCycleOn);
fbAutoOff_RTRIG(clk:=bAutoCycleOff);

IF bAutoMode & fbAutoInit_RTRIG.Q AND NOT fbAutoOff_RTRIG.Q THEN
    bPumpOn:= TRUE;
    iState:= 10;
ELSE
    bPumpOff:= TRUE;    
    iState:= 0;
END_IF;
CASE iState OF 
    10:
    // timer init to let the pump run well
    fbStartautotimer(IN:bPumpOn,PT:T#2s);
    IF fbStartautotimer.Q THEN
        fbStartautotimer(IN:=FALSE);
    END_IF;
    fbCycle_RTRIG(clk:=fbStartautotimer.Q);
    IF fbCycletrigger_RTRIG.Q THEN
    iState:= 20;
    sCurrentCycleState:= "Pressing cycle start";
    END_IF;
    20:
    IF iPressure <= iPressure_setpoint AND NOT bLimitswitch2 & fbAutoOff_RTRIG.Q THEN
    bTableDown_valve:= TRUE;
    sCurrentCycleState:= "Pressing to the pressure setpoint";
    iState:= 30;
    ELSE
    bTableDown_valve:= FALSE;
    sCurrentCycleState:= "Cycle stopped, reset";
    END_IF;
    30:
    // expression cycle completed, move the table upwards to 0 position
    fbZeropos_RTRIG(clk:=iState:=30);
    IF fbZeropos_RTRIG.Q AND NOT bLimitswitch3 & fbAutoOff_RTRIG.Q THEN
    bTableUp_valve:= TRUE;
    iTotalAutoCycles:= iTotalAutoCycles +1;
    sCurrentCycleState:= "Zeroing table, cycle end";
    END_IF;
END_CASE;

I would appreciate a helping hand on this one.

Also wondering if this: https://www.waveshare.com/wiki/3.5inch_HDMI_LCD

can be hooked up to display the pressure? And assign some leftover DI's for +/- ?

@josar Yes, we have a lot of leaking problems at the moment, but its almost finished. Still trying to figure out something more basic for HMI than a weintek panel. I will post the updates with some pictures soon, gonna take about 2 weeks I hope.

Im back, got my hands on an used STS ATM/T 0-400bar, 0-10V output. Configured AI1.1 for voltage mode, plugged the sensor into air line, got some readings after the transformation on around 6,3-6,4bar so it seems correct.

Now when i have the pressure value I should start coding the machine program itself.

For first i would want and idle menu machine state, use some kind of case instruction to choose between the automatic and manual press mode where:
In auto, some RO's would stay on until the before set pressure is met and until limit switches arent tripped.
Where in manual, no more than 400bars and also to the min/max limit switch positions.

Could you guys guide me or show some .st examples? I've no idea on how to start it right.

Also is there a way to connect a simple display to neuron, and also program plc to output for example the A1.1 value?
I know there is a full hmi panel available, but I would prefer something simple, + / - using DI's, and simple lcd/segment display for it, so an operator could adjust the set pressure for auto mode easily.

Hi @martin-kudláček, yes, i did reconfigure the module, even twice, trying to swap between the sensor's voltage and current output, with the same result.
New sensor is on the way, i should give some updates tomorrow.

@martin-kudláček Very detailed tips, i found the setting immediately. I lost myself while looking for parameters under Variable Browser.

I applied the transformation, first at Analog Type - > Current, i've set the points just like u said, but...

Not sure, but 95% that my sensor is dead, cause the PLC Value reading was oscillating between 0.0078 to 0.0106 or something, the exact same reading is shown when there is nothing wired to the AI1.1/AGND on open contacts.

I will try to check the pressure sensor alone, ordered another new one, and I will post back the results on a new sensor.

Thanks a lot for help, will come back to this topic after it arrives.

Hello, im new to the board and to the topic of automation, and i require some assistance.
I see there are some experienced users which I hope will lend me a helping hand.

For a brief overwiew: we decided to use Neuron M203 to replace the old Simatic S7 300 which stopped functioning for unknown reasons ( we bought the press in fatal condition ). Anyway while the whole hydraulic loop and mechanical issues are being fixed meantime, I'm supposed to rebuild the wiring and wire up & program the PLC.

I've followed all tutorials on Mervis IDE, had some success wiring some easy test limit switches on DI 1-4 which were activating some RO's using fbd.

But now as my first task is to verify if the analog pressure sensor which came with the press is actually working.
Its APLISENS PC-28, and i think of using it in current mode 4-20ma, correct me if im wrong.

Unfortunately cant find the manual in english atm, ask me anything.

https://www.aplisens.com.pl/pdf/produkty/PC-28.pdf

The sensor is 0-400 bar.
So my first issue is, how do i actually realize the analog input scaling in Mervis? I saw that other IDE's include some example/ready to go function blocks that easily bring the REAL AI1.1 output (which is in mA if im correct?) to an INT/DINT variable, so in the end we'll be able to set an example.

I tried to write my own .st function which will take the reading of the AI, store it in another global variable, then do the maths and output scaled value into another global var.

While i completely get the concept I need a walkthrough and how-to step by step on how to do it right.
Is it possible, and how hard is to write a simple function block for the scaling? Maybe there is a function in IEC that solves this?