[EXAMPLE] Latching Pushbutton Selector - Classic Ladder
17 Jan 2023 00:47 #262201
by spumco
[EXAMPLE] Latching Pushbutton Selector - Classic Ladder was created by spumco
So I'm trying to set up rapid override physical buttons and getting a little lost. Want one for 5%, one for 25%, and one to reset to 100%.
Buttons are momentary and my first attempts using a mux4 didn't work because as soon as I release a button the whole thing reverts to whatever value is in mux.N.in0
Can't set them up as basic toggles... I want each value persistant until one of the other buttons is pressed.
Do I need to set up something like a three-way toggle2nist chain where any two buttons will 'turn off' the third?
Or is this something better done in CL? I sort of think of each button as a holding relay and either of the other two can de-energize the relay coil. Those outputs could then go to a hal mux selector to set the RRO value (I think).
Thoughts?
Buttons are momentary and my first attempts using a mux4 didn't work because as soon as I release a button the whole thing reverts to whatever value is in mux.N.in0
Can't set them up as basic toggles... I want each value persistant until one of the other buttons is pressed.
Do I need to set up something like a three-way toggle2nist chain where any two buttons will 'turn off' the third?
Or is this something better done in CL? I sort of think of each button as a holding relay and either of the other two can de-energize the relay coil. Those outputs could then go to a hal mux selector to set the RRO value (I think).
Thoughts?
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17 Jan 2023 14:36 - 17 Jan 2023 14:40 #262237
by andypugh
Replied by andypugh on topic [EXAMPLE] Latching Pushbutton Selector - Classic Ladder
It might be possible to do it with a cunning arrangement of
linuxcnc.org/docs/stable/html/man/man9/flipflop.9.html
(With them resetting each other) but I can't quite figure out how.
I think it's a job for a simple custom comp.
See linuxcnc.org/docs/stable/html/hal/comp.html for more info on how to compile and install.[1]
[1] For future readers
linuxcnc.org/docs/stable/html/man/man9/flipflop.9.html
(With them resetting each other) but I can't quite figure out how.
I think it's a job for a simple custom comp.
component multilatch;
pin in bit button-##[32:personality];
pin in float value-##[32:personality];
pin out float output = 100; // Put the starting default value here
license GPL2+;
author andypugh;
;;
int i;
for (i=0; i < personality; i++){
if (button(i)) output = value(i);
}See linuxcnc.org/docs/stable/html/hal/comp.html for more info on how to compile and install.[1]
[1] For future readers
Last edit: 17 Jan 2023 14:40 by andypugh.
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17 Jan 2023 16:45 #262252
by spumco
Replied by spumco on topic [EXAMPLE] Latching Pushbutton Selector - Classic Ladder
Thanks Andy.
I had a think about it and realized a three-way latching circuit in Ladder should work nicely.
Rough diagram:
The values are managed by a mux4. sel0 & sel1 are netted to the ladder outputs. If neither the 20% or 5% are on/true, it defaults to mux4.in0 = 100
I'll have go at it tonight and see how it works.
I had a think about it and realized a three-way latching circuit in Ladder should work nicely.
Rough diagram:
The values are managed by a mux4. sel0 & sel1 are netted to the ladder outputs. If neither the 20% or 5% are on/true, it defaults to mux4.in0 = 100
I'll have go at it tonight and see how it works.
Attachments:
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17 Jan 2023 17:04 #262254
by spumco
Replied by spumco on topic [EXAMPLE] Latching Pushbutton Selector - Classic Ladder
Brain wave...The override should default to 100% with no inputs, but the 100% LED won't light up until the button is pressed.
I think I might need to net the 100% ladder input to the button or a one-shot at machine-on to set the initial state.
I think I might need to net the 100% ladder input to the button or a one-shot at machine-on to set the initial state.
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18 Jan 2023 02:13 #262309
by spumco
Replied by spumco on topic [EXAMPLE] Latching Pushbutton Selector - Classic Ladder
Got it working in classic ladder, and I'll leave this as an example (hence the re-named thread title)
HAL snippet
#RAPID OVERRIDE BUTTONS
net BTN-RRO-RESET => classicladder.0.in-10
net BTN-RRO-20 => classicladder.0.in-11
net BTN-RRO-5 => classicladder.0.in-12
net MACHINE-IS-ON => classicladder.0.in-13
net LED-RAPID-RESET <= classicladder.0.out-07
net RRO-OUT-20 <= classicladder.0.out-08
net LED-RAPID-20 <= classicladder.0.out-09
net RRO-OUT-5 <= classicladder.0.out-10
net LED-RAPID-5 <= classicladder.0.out-11
MUX4 section
#RAPID OVERRIDE BUTTONS
setp halui.rapid-override.direct-value true
setp mux4.rro.in0 100
setp mux4.rro.in1 20
setp mux4.rro.in2 5
setp halui.rapid-override.scale 1
net BTN-RRO-RESET => halui.rapid-override.reset
net RRO-OUT-20 => mux4.rro.sel0 #SIGNAL FROM CLASSIC LADDER
net RRO-OUT-5 => mux4.rro.sel1 #SIGNAL FROM CLASSIC LADDER
net RRO-S32-CONV <= mux4.rro.out
net RRO-S32-CONV => conv-float-s32.1.in
net RRO-VALUE <= conv-float-s32.1.out
net RRO-VALUE => halui.rapid-override.counts
net RRO-VALUE-OUT <= halui.rapid-override.value
Hope it helps someone.
(Moderators feel free to move this to CL or somewhere else if you think it's appropriate.)
- Explanation
- Momentary pushbutton array acting like a selector switch
- Result is an xor button array (exclusive-or)
- Combine with HAL mux component (mux2, mux4, etc) to output a set value to something for each button
- Function
- Push a button and the button's output latches high
- Push any other button and that button's output latches high, and all other outputs go low
- Usage
- The example is used in my case for a physical button rapid-override control. I wanted a 'Haas' type control, where there were dedicated buttons with specific RRO values (100%, 20%, and 5% in my case)
- The outputs are connected to a mux4 component, and the 20% and 5% outputs control the mux4.N.sel0 and mux4.N.sel1 selection.
- Values are set with the mux4 'in' pins. Because of the xor ladder output function, mux4.N.in3 can be left without a value as sel0 & sel1 can't be output at the same time.
- The float_s32_conv component is necessary in my case as RRO counts is s32, and the mux4 output is a float.
- Modification
- Example is for three buttons, but can be extended as far as you've got ladder inputs/outputs available
- Additional outputs can be tied to each output
- In the example, there are two HAL outputs per line - one controls the rapid-override value, and one illuminates an LED on the physical momentary button
- Optional
- Timer is a one-shot and is used to set the initial state of the first rung
- Triggered by halui.machine-is-on
- Without the timer the initial state won't be set until one of the buttons is pressed.
- Timer is a one-shot and is used to set the initial state of the first rung
HAL snippet
Warning: Spoiler!
#RAPID OVERRIDE BUTTONS
net BTN-RRO-RESET => classicladder.0.in-10
net BTN-RRO-20 => classicladder.0.in-11
net BTN-RRO-5 => classicladder.0.in-12
net MACHINE-IS-ON => classicladder.0.in-13
net LED-RAPID-RESET <= classicladder.0.out-07
net RRO-OUT-20 <= classicladder.0.out-08
net LED-RAPID-20 <= classicladder.0.out-09
net RRO-OUT-5 <= classicladder.0.out-10
net LED-RAPID-5 <= classicladder.0.out-11
MUX4 section
Warning: Spoiler!
#RAPID OVERRIDE BUTTONS
setp halui.rapid-override.direct-value true
setp mux4.rro.in0 100
setp mux4.rro.in1 20
setp mux4.rro.in2 5
setp halui.rapid-override.scale 1
net BTN-RRO-RESET => halui.rapid-override.reset
net RRO-OUT-20 => mux4.rro.sel0 #SIGNAL FROM CLASSIC LADDER
net RRO-OUT-5 => mux4.rro.sel1 #SIGNAL FROM CLASSIC LADDER
net RRO-S32-CONV <= mux4.rro.out
net RRO-S32-CONV => conv-float-s32.1.in
net RRO-VALUE <= conv-float-s32.1.out
net RRO-VALUE => halui.rapid-override.counts
net RRO-VALUE-OUT <= halui.rapid-override.value
Hope it helps someone.
(Moderators feel free to move this to CL or somewhere else if you think it's appropriate.)
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18 Jan 2023 02:43 #262314
by tommylight
Replied by tommylight on topic [EXAMPLE] Latching Pushbutton Selector - Classic Ladder
Changed the tittle for all posts.
Thank you.
Thank you.
The following user(s) said Thank You: spumco
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