PL7 Pro Programming Fast Counting Card

I don't know where you found %ID3.11.0? Rather try: %ID3.0 if encoder on channel 0 or %ID3.1 if encoder on channel 1. Your calculation principle is good, provided that your step X14 lasts only one polling cycle. Otherwise, you will make your calculation as long as %S6 is equal to 1, which could be for 0.5 seconds. Your value will always be in motion. Since the magelis will retrieve this value in the background, you won't know when. So it will display anything. I don't understand your %MW24 magelis display. When you configure the magelis, you create a dialogue table. For example, parameters in the magelis. %MW20 = Page number displayed XBT -> API %MW21 = Page to process XBT <-> API %MW22 = Alarm table XBT <-> API In the PLC, you just need to put in %MW21 the page number where there is the message containing your speed variable (%MD2), and it will read it automatically. For your calculation, it's better to use a double word. Because it's not a calculator, it won't tell you if there's an overflow and you'll end up with anything. Note that if you use %MD2, it gives %MW2 = low word of %ID2 %MW3 = "high word of %ID2. If you just need to display the speed, why bother with a grafcet?

Yes, that's good up to 500KHz. I'm sorry, but I made a calculation error; your counting card is more than sufficient. Since it accepts 500,000 pulses/s and the encoder will give 25,600 pulses/s at 1500 RPM. To convert encoder pulses into speed, you just need to take the system bit %S6, which has a time base of one second between two rising edges. You set a preset encoder value of 0. - Rising edge %S6 validates the preset bit to have the current encoder value = 0 - Falling edge %S6, load encoder value %IDx.0 into %MD1 depending on the direction of rotation; %MD1 will be positive or negative, if negative multiply by -1. From there, you know the number of pulses in 0.5s. Then you just need to convert it to RPM, which you place in %MD2. In the display, you just need to retrieve %MD2.

In trying to add a second computer to my network at home, I messed things up and lost connection. But here I am again. In the preliminary: - Transforming the system bit %S6 into an internal bit (to allow the use of edges) - Validation counting card - If the measurement is invalid (%Iwx.i.2:X7), load the preset value on edge %S5 with a time base of 100ms - Load the preset value on the rising edge %S6 - Load the encoder value on the falling edge %S6 into %MD1 - Calculation Example: Knowing that x = rack position in the PLC i = encoder channel (0 or 1) %S6 |---| |------------------------------------------------------(%M6)-| |----------------------------------------------------------(%Qx.i)-| %IWx.i.2:X7 %S5 |----| |-----------| |---+-------------------------------(%Qx.i.1)-| | %M6 | |----|P|-----------------+ %M6 operation |--|N|-----+----------------------------------------[%MD1:=%IDx.i]-| | comp operation +--[%MD1<0]-----------------------------[%MD1:=%MD1*-1]-| For the calculation, knowing you have 25600 pulses/s for 1500 rpm, for a time base of one second. As in the example we are in a time base of 0.5s, we will therefore have 12800 pulses for 1500 rpm. Then just do the rule of three, but to avoid calculation overflow 12800 ==> 128 1500 ==> 15 This gives: operation |------------------------------------------[ %MD2:=(%MD1*15)/128 ]-| For the display, just add a field and place the variable %MD2 and that's it. It should be noted that I am proposing a solution here, and not the solution. Each programmer has their own tricks.<code>

The problem is not there. Since it takes you 0.5s to know the motor speed, and in your example %MD2 will vary during 0.5s. And you cannot know when the Magelis will take it. Your displayed value will be random. In this case, you must necessarily use a front. Apparently, you have a problem with fronts!!! Example: %S6 |--| |-----------------------------------------------------(%M6)-| %M6 %X14 |--| P or N |-------| |-------------[ %MD2:=(%ID3.0*1500)/6400 ]-| As long as step X14 is active, the calculation will be done. So refreshing every second in the TSX. The Magelis has a refresh rate of about every second, so there's no point in going faster. I set M6 to rising or falling edge because I don't know when you load the preset value. Be careful, it must be reloaded at each edge.