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### Question #: 3444

Question: Limit, E-stop and home switches: To set up the maximum number of switches set up I would need 2 BOB's, correct? How is this implimented and wired?

Current Solution

The parallel breakout board allows for 4 input connections. Each input connection can have an unlimited number of switches, but if you need to separate the switch circuit for, say, all of the home switches, you can use another input pin. There is no need to add another breakout board to add more switches unless you need to use the input pins for totally unique conditions that may or may not be related to CNC functions.

Customer response:
To Clarify: I need to set up 3 home switches which can double for limits (that's 3 pins.). Another pin for a probe. That's 4 pins used. Now I need to set up the other limit and E-stop switches. No pins left, how do I do that? Can a ground pin be doubled up on?

Plus, I have a SuperPID. Another pin?

Additional answer:
You can put all of your limit switches (including the E-stop which serves the same purpose as the limit switches) and home switches on a single pin. When homing, mach3 will move the axis it wants to home, hit the switch, pull away from the switch, then move the next axis and repeat the steps for the next two axes.

The probe is on the 2nd pin. The SuperPID is on the 3rd pin and now you have another pin remaining.

The GND terminal can be doubled up.

Additional Information:
how about a diagram to reference showing the pin-out to use

Here is the diagram for the parallel breakout board (pins 10 through 13 are used for input):

The circuit is from the GND to the input

Here is the diagram for the Mach3 USB board (pins I1 through I4 are used for input):
https://www.buildyourcnc.com/Documents/Electric%20Wiring%20Diagram.pdf
The circuit is from the V- to the input pin

Respond:

### Other Possible Solutions to this Question

• LIMIT SWITCHES FOR AXIS. THE PRINT SHOWS THAT YOU CAN WIRE LIMITS EITHER N.O. OR N.C. SO IF THIS IS CORRECT I WOULD NEED TO TELL BOARD IN SOFTWARE HOW LOOK AT THESE LIMITS, I'M GOING GET AN INPUT LOOSE DEPEND ON IT.

BYCNC Response:
This is correct. You will need to use a method appropriate for the software you are using. Also remember that NC switches are typically wired in series, while NO switches are normally wired in parallel.

User Response:
I am using the cnc planet software for your USB board. Are the limit configurations in this software?

BYCNC Response:
Yes, Planet CNC software is compatible with the use of limit switches. Configuration information will depend on your specific application. You can view Planet CNC's information here: http://www.planet-cnc.com/files/CNCUSBController.pdf

• Limit switches for axis. The print shows that you can wire the limits either n.o. or n.c. so if this is correct I would need to tell the board in the software how to look at these limits, I'm either going to get an input or loose an input depend on how i wire it.

BYCNC Response:
This is correct. You will need to use a method appropriate for the software you are using. Also remember that NC switches are typically wired in series, while NO switches are normally wired in parallel.

User Response:
I am using the cnc planet software for your USB board. Are the limit configurations in this software?

BYCNC Response:
Yes, Planet CNC software is compatible with the use of limit switches. Configuration information will depend on your specific application. You can view Planet CNC's information here: http://www.planet-cnc.com/files/CNCUSBController.pdf

• [59] is it ok to use one pin for all of the limit switches wired NC and another pin for a z probe that is NO, or do all input pins need to be the same (NC or NO)? I would like to use LinuxCNC but will use Mach3 if necessary. a thanks!

It's generally acceptable to use one pin for all of your limit switches wired Normally Closed (NC), and another separate pin for a Z probe that is Normally Open (NO). LinuxCNC is quite flexible and allows for mixed configurations of NC and NO switches.

Just ensure you configure LinuxCNC correctly to recognize each pin's logic (Active low or active high). And perhaps run a few tests before running the machine.

Additional Information:
It's generally acceptable to use one pin for all of your limit switches wired Normally Closed (NC), and another separate pin for a Z probe that is Normally Open (NO). LinuxCNC is quite flexible and allows for mixed configurations of NC and NO switches.

Just ensure you configure LinuxCNC correctly to recognize each pin's logic (Active low or active high). And perhaps run a few tests before running the machine.

• If I purchase the [blackToe 2x4 v4.1 CNC Machine Kit - USB Electronics - Table Included] all I would need for this CNC to be fully operational is a laptop with mach 3 software and a router. Is this correct?

if you purchased the USB interface, you will need planet-cnc software rather than Mach3, and you will need a usb cable to connect the usb interface to the computer.

The blackToe 2x4 CNC Machine Kit with optional table will need wire to connect the electronics. Don't forget to get some end mills to use for cutting the intended material.

Additional Information:

Additional Information:

Additional Information:

• Additional to Question 3444: Additional Information: To Clarify: I need to set up 3 home switches which can double for limits (that's 3 pins.). Another pin for a probe. That's 4 pins used. Now I need to set up the other limit and E-stop switches. No pins left, how do I do that? Can a ground pin be doubled up on? Plus, I have a SuperPID. Another pin?

You can put all of your limit switches (including the E-stop which serves the same purpose as the limit switches) and home switches on a single pin. When homing, mach3 will move the axis it wants to home, hit the switch, pull away from the switch, then move the next axis and repeat the steps for the next two axes.

The probe is on the 2nd pin. The SuperPID is on the 3rd pin and now you have another pin remaining.

The GND terminal can be doubled up.

• would like to install 50k.potentiometer (2.45)to the back of my temp. gauge to set correct reading. will this work?

Could you please clarify the specific application and the desired outcome?

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would like to install 50k.potentiometer (2.45)to the back of my temp. gauge to set correct reading. will this work?

• I have wired up my 110v VFD and my 2.2Kw spindle and I get an E.Lu.5 code. My wiring is correct and the parameters are set to those for the VFD according to your website I found in a previously answered question from someone here. Any help would be greatly appreciated, thank you!!

The E.Lu.5 Error code on your VFD is related to Low Voltage.

The recommended action is:
- 1. Check whether the input voltage is normal. (the voltage from the wall/breaker to the VFD)
- 2. Check whether there is a sudden change in load.
- 3. Check whether there is any phase missing.

Unfortunately, these three recommended actions will probable require an electrician to test the line going into the VFD.

Additional Information:

• https://www.buildyourcnc.com/images/mach3USBCardWiringdiagram-800.jpg I would like to know the settings such as the pin number for 0 to 10V output of AVI+ and AVI- as in this wiring diagram.

The pin number for the PWM output for the Mach3 USB controller is pin #3 and O3 (out3). This setting should be specified in the motor outputs tab in the ports and pins dialog box for the spindle signal line.

Click the link to add information to this solution:
https://www.buildyourcnc.com/images/mach3USBCardWiringdiagram-800.jpg I would like to know the settings such as the pin number for 0 to 10V output of AVI+ and AVI- as in this wiring diagram.

• [575] I have finally got my limit switches wired and working - thank you. Can they also used as homing switches and if so it it just a question of looping the two inputs on the board i.e. the limit and home terminals IN2 to IN3

You will want to connect the homing switches (which may also serve as your near limit switches) to different input terminals. It's ok to add more limit switches with the home switches, but each home should be on independent inputs. For example, connect home X and any other limit switch to IN1, connect home Y and any other limit switch to IN2, and so on. This will allow you to properly use the "ref all home" button in Mach3.

Additional Information:

Additional Information:
In the instructions (diagram 1) you show all the home switches connected in parallel? But here you say they need to each have their own inputs. "You will want to connect the homing switches (which may also serve as your near limit switches) to different input terminals." I dont see how the second and third axis can go home if the first axis has already closed the parallel circuit unless they back off a bit until the switch opens up again before the next axis goes to home? My machine has no limit switches so I assume they are home switches.

• Mach3 USB Interface Board, My switch inputs are def wired active-LOW but I need to set them as active-HI (red x) in ports & pins to make them work correctly, why would this be?

The inputs on the Mach3 USB board require that you complete the circuit with the V-, so that means that the inputs will fire on a high signal, hence the "Active High". That is simply how the Mach3 USB board is designed. The inputs, output and spindle connections on that side of the board require the V+ and V- to be connected to a 24V supply (most spindle VFDs have an available 24V output terminal for this use).

Additional Information:
Touch plate signal works and script is loaded but no touch plate function

Click the link to add information to this solution:
Mach3 USB Interface Board, My switch inputs are def wired active-LOW but I need to set them as active-HI (red x) in ports & pins to make them work correctly, why would this be?

• I HAVE A 2000 WK 11–3 Z LIMIT SWITCHES GOING TO C10R10 BREAKOUT BOARD . CAN ALSO USE THEM AS MY HOME POSITION WELL. NEED THE WIRING CONFIGURATION

No, you should not have received two parallel breakout boards in your CNC kit. You can return the extra item using standard shipping with COD. Our apologies for the confusion and the inconvenience.

I will answer the other question as another FAQ. Please check the Customer Service page to see the answer to that question.

If you have difficulty finding the answer, here is a link:
https://www.buildyourcnc.com/FAQ/13636

Click the link to add information to this solution:
I HAVE A 2000 WK 11–3 Z LIMIT SWITCHES GOING TO C10R10 BREAKOUT BOARD . CAN ALSO USE THEM AS MY HOME POSITION WELL. NEED THE WIRING CONFIGURATION

• Hello, I am trying to configure Home and Limit switches using the Pokeyes57cnc and NC switches. I am confused on the procedure of setting this up. wiring to the board and setting up in Mach4. Can you direct me to a tutorial or offer some suggestions? Thanks Dale

NC mechanical switch configuration is supported. You can download the manual from this page (Mach4 plugin and manuals):
https://buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach4-mach3-USB-ethernet-Board

The pokeys57CNC controller has input terminals and pins for limit switches on each of the 8 axes. There are three separate inputs per axis, two for the actual limits of that axis, and one for the home position.

Connect each switch between the GND terminal and its respective axis limit terminal/pin. For instance, the limit switch will typically have three leads, COM, NC, and NO. In an NC configuration, the NC connects to the terminal/pin, say, Axis 1 lim +, and the COM connects to the GND terminal.

In Mach4, in the new device wizard, make sure to specify the correct option on the home and limit switches that matches the machine configuration.

Additional Information:
can you use one switch per axis for home only?

• In the video 'Primer on Homing and the Use of Limit Switches' Patrick refers to pin number "13". Is this in fact pin "i3"?

The parallel breakout board uses pins 10 to 13 relating specifically to the pin numbers on the parallel port. It is in fact 13 and not i3.

The mach3 USB board does use the I1-I4 using the I to represent the word "input"; hence I3 (i3).

Thanks for the question and wanting clarification.

Click the link to add information to this solution:
In the video 'Primer on Homing and the Use of Limit Switches' Patrick refers to pin number "13". Is this in fact pin "i3"?

• I am converting from a Parallel Port to the Mach3 USB. My limit switches can accomodate up to 5VDC and I want to Drive a Relay from one of the outputs. Will my switches work and do I need a 24VDC Relay?

Yes, the best way to attach a relay to the output of the Mach3 USB board is to use an SSR (Solid State Relay) at the 24 Volt rating. This is the standard supply for this side of the Mach3 USB board.

Click the link to add information to this solution:
I am converting from a Parallel Port to the Mach3 USB. My limit switches can accomodate up to 5VDC and I want to Drive a Relay from one of the outputs. Will my switches work and do I need a 24VDC Relay?

• [575] does the 24VDC input actually need 24 VDC if only using the input for homing switches? Can you use 12 VDC? and would it be damaged with a higher voltage than 24 VDC?

Yes, you can use 12VDC for the MAch3 USB controller at the 24V and DCM terminals. I have not tested using 12VDC in conjunction with the ACM and AVI terminals (PWM output) to control the spindle speed. PWM typically requires a reference voltage (from the VFD) and it's own voltage to produce the PWM signal. I am not sure if 12VDC is sufficient for the PWM. I have tested the inputs with 12VDC and they work fine.

Click the link to add information to this solution:
[575] does the 24VDC input actually need 24 VDC if only using the input for homing switches? Can you use 12 VDC? and would it be damaged with a higher voltage than 24 VDC?

• I have a 2000 WK 11–3 Z limit switches going to A c10r10 breakout board . Can I also use them as my home position as well. I need The wiring configuration

No, you should not have received two parallel breakout boards in your CNC kit. You can return the extra item using standard shipping with COD. Our apologies for the confusion and the inconvenience.

I will answer the other question as another FAQ. Please check the Customer Service page to see the answer to that question.

If you have difficulty finding the answer, here is a link:
https://www.buildyourcnc.com/FAQ/13636

Click the link to add information to this solution:
I have a 2000 WK 11–3 Z limit switches going to A c10r10 breakout board . Can I also use them as my home position as well. I need The wiring configuration

• I bought a, 3-Axis NEMA23 CNC Kit (36V/9.7A/382oz-in/KL-4030.but dont know how to set the dip switches on my drivers. The place I bout the kit from isent very good and support.

That driver (not purchased here) is a standard 3.0 amp driver that will have the dip switch settings on the top of the driver. You will need to determine the amp rating of you motor for the scheme that you wire your motor to the driver (bipolar parallel is recommended in most circumstances but can depend on your power supply output). Check the stepping motor datasheet for your motor to determine this amp rating.

The other set of switches will be configure the microstepping. This will depend on your mechanical setup (i.e. lead screw, rack and pinion, roller chain, timing belt, etc.) and the specifications of such mechanical parts.

This general formula (which can be searched using the Customer Service Live with many examples): step/inch = (natural motor steps * desired microsteps) / (mechanical travel for one motor rotation)

Additional Information:

Additional Information:

Additional Information:

Click the link to add information to this solution:
I bought a, 3-Axis NEMA23 CNC Kit (36V/9.7A/382oz-in/KL-4030.but dont know how to set the dip switches on my drivers. The place I bout the kit from isent very good and support.

• I work with carpet & padding and need to cut carpet to create clean 90 degree corners, and patterns for inlay's. The work area would need to be a minimum of 12 ft by 15 ft. Is there an affordable kit that could accommodate this size

The largest cutting area machine we have available is our greenBull 6X, which allows a cutting surface of 6' x 12'. The limit of our machines is the x-axis being the width, but you can elongate the machine as far as you require, being 15 Ft. or more.
I would highly recommend a visit to our R&D page, which allows you to post ideas/requests and to view the current tasks that we are working on!

• I am looking to set up a long table, 4 x 12 foot I would need to cut wood of modest density less than 1 inch thick, and I would also need to bevel some of the cuts, so I think this is a four axis unit. Which of your kits plus upgrades would make sense? I am very capable of assembly of a bunch of boxes full of parts.

Dealing with a 4' x 12' machine, our blackFoot kit will be your best option. Since our machines are only limited to the width but not length wise, you can add however much extra rail and roller chain to accommodate your extended length. Now adding our 4th axis kit (https://www.buildyourcnc.com/item/axes-4th) will be needed for your 4th axis (unless custom design is required).

These items will be the best requirements to build a 4' x 12' 4th axis machine.
Machine (either parallel/USB BoB): https://www.buildyourcnc.com/blackFoot48v40.aspx
4th axis: https://www.buildyourcnc.com/item/axes-4th

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