BAUMER ELECTRIC MY COM E75/500 PRECISION LIMIT SWITCH

[beerus]

Hi.  Can use these sensors home switch?  BAUMER ELECTRIC MY COM E75/500 PRECISION LIMIT SWITCH.  If so, how to connect them to PMDX 424? Thanks

[Bob at PMDX]

Since they appear to be purely mechanical (no electronics) they should be OK.  However, the specifications on the sample that I found online here (look at the 3rd image, a close up of the label):

http://www.baumer.com/us-en/products/productfinder/?tx_baumerproductfinder_pf%5Burl%5D=%2Fpfinder_sensor%2Fscripts%2Fproduct.php%3Fcat%3DCONFMyAppli%26psg%3DmadynPGGrundfunktion%7CMy_Com%2CmadynGrundfunktion2%7C1976991042%26pid%3DMy_Com_E75_80%26language%3Den%26country%3D%26header%3D%26ptk%3D

say that the maximum DC switching current is 2mA (milli-Amperes).  The PMDX-424 inputs, when shorted to ground, will source between 4 and 5 mA.  I measured 4.65mA on my sample board.  This is greater than the specified maximum current.

I recommend using a different switch.  These switches would probably work for a while.  But exceeding the maximum current rating will cause the switch to fail at some point, either by making intermittent contact or a total failure (stays open or stays closed).

If you do find an alternate mechanical switch to use, you would connect one wire to the "GND" terminal on J16 or J17 on the PMDX-424, and the other wire to one of the input terminals on J16 or J17 labeled "1" through "8".

Bob

[beerus]

Thank