Endress+Hauser Levelflex FMP55 - Page 29

Levelflex FMP55
Endress+Hauser 29
Connection examples for the switch output
For HART devices, the switch output is available as an option. See product structure, feature 20:
"Power Supply, Output", option B: "2-wire; 4-20 mA HART, switch output"
Devices with PROFIBUS PA and FOUNDATION Fieldbus always have a switch output.
3+
+
-
4-
R
i
A0015909
 16 Connection of a relay
Suitable relays (examples):
• Solid-state relay: Phoenix Contact OV-24DC/480AC/5 with mounting
rail connector UMK-1 OM-R/AMS
• Electromechanical relay: Phoenix Contact PLC-RSC-12DC/21
3+
2
1
+
4-
R
i
A0015910
 17 Connection of a digital input
1 Pull-up resistor
2 Digital input
For optimum interference immunity we recommend to connect an external resistor (internal
resistance of the relay or Pull-up resistor) of < 1 000 Ω.