Industrial io board

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Industrial io board

Page last updated 03 Sep 2013, by Egon V. 8 replies baseboard, ESD, industrial, PLC

Baseboard for industrial applications. Project Finished

Board Box open

Project background

The idea is to create base board for mbed that could be installed and used in industrial environment. Possible applications could be, from monitoring production equipment to PLC applications.

Features

Based on mbed NXP LPC1768
2 x RS232
4 Digital inputs (PNP, sourcing) with 2.5V logical state change, max input level +30V
4 Analog inputs (0-10V), can be used as digital inputs in 24V systems
2 Digital PNP outputs with PWM, each which can drive up to 1Amp (24VDC) based on P-MOSFET NDT454
1 Digital PNP out with 5V output shared with USB host power (even if 24V is applied as system voltage)
1 Analog out (0-10V) driven by operational amplifier (only with >10V power supply)
Short circuit protected outputs
Fused USB host and programming USB
Onboard temperature sensor MCP9701AT
both USB and Ethernet with ESD suppressors
USB Host detect
USB Host power reset capability
External programming USB with Programming detect
Hard reset (resets everything, etc mbed-interface)
~~microSD card~~
4 mbed's LEDs indicate the working status
~~Onboard prototyping area for remaining mbed pins~~
~~Free locations on external connector for prototyping~~
Aluminium enclosure supporting DIN rail installation

Power specs

Board power supply: input 5V to 30VDC
Onboard 5V converter 1Amp
2 power options, USB 5V or 6.5-30VDC from terminal connector. No power plug.
Compatible with 24VDC industrial power supplies
1 output can supply 5V for external systems
Max 30VDC voltage range e.g. cannot be used for switching 120-240VAC

8 comments on Industrial io board:

Willem Braat

# 28 Feb 2012

Looks very promising.. Interested definitely!

hugo stoutjesdijk

# 28 Feb 2012

Good start. I also work with this kind of applications. The problem, always the wrong choice. So now I'm trying to work more with i2c extensions. An I / O with 24v inputs (2803 in reverse) and 24v darlington outputs(for (proximity)switches and solenoids). An I2C LCD board with switches on the unused io the MCP23017 or other. Btw how is the analog part working when you use only 5V.

Kevin Braun

# 29 Feb 2012

I noticed "DIN rail installation". Does this mean you expect the end product to operate outdoors? If so, be sure the mbed can handle your temperature / moisture requirements. ...kevin

Egon V

# 01 Mar 2012

Thanks for replies,

Kevin Braun wrote:

I noticed "DIN rail installation". Does this mean you expect the end product to operate outdoors?

Not necessarily. DIN rail installation means that it can be installed on indoor machines. Outside installations would require a "field box" anyway. I have written page about protecting Mbed from environment Conformal Coating Mbed

hugo stoutjesdijk wrote:

Btw how is the analog part working when you use only 5V.

Yes, this configuration gives us @5V max 5V/3 at voltage divider, which is not expected maximum 3.3V for AnalogIn. We are working on that, but if there's no good ideas, then one has to expect lower voltages at AnalogIn and program the device accordingly.

ivo ellik

# 01 Mar 2012

Actually analogin is not a problem, it should be working even in case we are using 5V power, but analogout won't work with 5V power, we don't get out 0 to 10V, we get only 0 to 5V, if we want to use analogout 0 to 10V, we need certainly additional power at least 10V.