B meters IWM-PL4 Quick User Manual page 9

The IWM-PL3 and IWM-PL4 modules are connected as follows:
1) Ground (BROWN) wire connected to the negative reference (Ground) of the output device that
reads the pulses. PLCs usually have opto-isolated inputs therefore sharing the masses does not
create anomalous currents.
2) Pulse output wire (WHITE, YELLOW AND GREEN) connected to the input of the device that reads
the pulses (PLC for example). Please note that this input must accept an NPN polarized Open
collector output with a voltage not exceeding 30V.
Sometimes it is necessary to connect the output of the IWM-PL3 or PL4 device with a device that only
accepts "clean" contacts. The clean contacts have thin name because they are not related to the mass
(NPN) or to the supply voltage (PNP). In this case, to make the two devices "talk" it is necessary to insert an
interface relay between the output and the input.
The principle connection scheme is as follows:
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