Endress+Hauser Memograph M, Brief Operating Instructions

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Wiring
30
4.2 Terminal assignment
"
Caution!
If high-energy transients occur when using long signal cables, we recommend connecting a suitable
overvoltage protection (e.g. E+H HAW560/562).
Use shielded signal lines for serial interfaces!
4.2.1 Cable specification, spring terminals
All connections on the rear of the unit are designed as screw or spring terminal blocks with reverse
polarity protection. This makes the connection very quick and easy. The spring terminals are
actuated with a slotted screwdriver (size 0).
Please note the following when connecting:
• Wire cross-section, digital I/O, RS485 and analog inputs: max. 1.5 mm
2
(14 AWG) (spring
terminals)
• Wire cross-section, power supply: max. 2.5 mm
2
(13 AWG) (screw terminals)
• Wire cross-section, relays: max. 2.5 mm
2
(13 AWG) (spring terminals)
• Stripped length: 10 mm (0.39 inch), 6 mm (0.24 inch) for power terminal
!
Note!
No ferrules have to be used when connecting flexible wires to spring terminals.
4.2.2 Connecting the interfaces
Ethernet, RS232/RS485 and USB connection
Details on connecting the interfaces can be found in the Operating Instructions on CD-ROM, chap-
ter 4.2.
4.3 Degree of protection
At the front, the unit meets the requirements of ingress protection IP65.