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Digital output of Electromagnetic Flow meter connect PLC

Digital output has 2 contacts: Digital output contact and Digital ground contact, the symbols are as following

POUT  ————  Digital output contact

PCOM  ————  Digital ground contact

POUT is open-collector output; users can do wiring according to following drawings:

4.5.3.1  Digital Level output wiring

digital-level-output-wiring

Fig.4.5(a) Digital Level output wiring

4.5.3.2  Digital output connect photoelectric coupler (for example PLC)

digital-output-connect-photoelectric-coupler

Fig4.5(b) Digital output connect photoelectric coupler

Generally, optocoupler needs around 10mA current, and E/R=10mA, so E=5~24V.


4.5.3.3 Digital output connect relay

digital-output-connect-relay

Fig4.5(C) Digital output connect relay

Normally, intermediate relay needs E =12V or 24V ,D is Flyback diode. Nowadays most of the intermediate relays contain this kind internal diode. If the intermediate relay does not have the flyback diode, users need to connect one externally.


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