A lot of customers buy SHD series magnetic flow meters from Silver Automation Instruments, and users often ask us how to connect our mag meter to PLC ?
Below is the explaination.
Digital output of SHD Electromangetic flow meter 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:
Digital Level output wiring
Digital output connect photoelectric coupler
Generally, optocoupler needs around 10mA current, and E/R=10mA, so E=5～24V.
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.