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Dear All,
1. We have number of protective relays in our switchgear to be connected to PLC. These relays have RS-485(3 terminals), Ethernet port (RJ 45 connector) and RS-232 for communication.
Which mode of communication is reliable? The distance between switchgear and PLC panel is about 25 meters.
The PLC is Schneider M340.
2. We have a pulse output from a flowmeter (Krohne Optisonic 6300), the test certificate tells the pulse output is passive. What is the meaning of passive here? Any power supply to be given?
Thank you beforehand for any inputs.
1. We have number of protective relays in our switchgear to be connected to PLC. These relays have RS-485(3 terminals), Ethernet port (RJ 45 connector) and RS-232 for communication.
Which mode of communication is reliable? The distance between switchgear and PLC panel is about 25 meters.
The PLC is Schneider M340.
2. We have a pulse output from a flowmeter (Krohne Optisonic 6300), the test certificate tells the pulse output is passive. What is the meaning of passive here? Any power supply to be given?
Thank you beforehand for any inputs.