B meters IWM-PL4 Quick User Manual page 8

This type of output (Open collector) is usually accepted as valid for devices such as PLCs. However, it's
necessary to check that the voltage applied to the contact, by the external device, does not exceed the
maximum bearable voltage. For IWM-PL3 and IWM-PL4 products this voltage is 30V in continuous electric
current (DC).
NB: remember that the voltage applied to the contact is supplied by the external device, not by the B
METERS IWM-PL3/PL4 module.
IT'S NECESSARY TO VERIFY THAT THE INPUT OF THE DEVICE TO WHICH WE WILL CONNECT OUR OUTPUT
IS:
1) Open collector type (NO CLEAN CONTACT or DRY CONTACT)
2) The voltage applied to the contact is less than 30V. This voltage coincides with the supply voltage of
the external reading device. Usually these voltage values are present: 3.3V, 5V, 12V or 24V
therefore lower than 30VDC.
3) The type of input accepted is NPN.
The last point is necessary because the contact is linked to a type of transistor which can be of two
"polarities" PNP or NPN.
The possibilities that can occur for an Open collector output are two:
 NPN type Open collector output: when there is an impulse the output goes to ground (which must
be in common between the IWM-PL3 or IWM-PL4 device and the external device).
 PNP type Open collector output: when there is an impulse the output goes to the supply voltage
(which must be in common between the IWM-PL3 or IWM-PL4 device and the external device).
The outputs of the IWM-PL3 and IMW-PL4 modules are of the first type: NPN.
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