Emerson Rosemount 5708, Reference Manual

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Reference Manual
00809-0100-4570, Rev DA
Electrical Installation
November 2017
Electrical Installation
4.4 Wiring
The units can be connected in different modes and configurations for different external systems such as
PLC or DCS and communications on RS-485, Modbus
®
RTU, and also to RS-485 bus converting adapters
to communication gateways such as Rosemount LinkPro for GMS or GPRS data relay and TCP/IP gateway.
For in-depth details and explanations on wiring and communication, refer to
“Different connection
methods” on page 29 .
Communications
Note
If electromagnetic interference is expected, usage of a screened and twisted wired cable is
recommended for the signal lines, which should be connected to the ground reference.
Power supply
For detailed information on power supply specifications, refer to Rosemount 5708 Product Data Sheet .
4-20 mA 4-wire: The power supply and signal current inputs must be carried over two separated pairs.
Connection procedure
For detailed information on the connection procedure, see “Different connection methods” on page 29 .
Note
Use direct connection between the Rosemount 5708 and the plant (PLC/SCADA).
For a remote connection, use the Rosemount LinkPro remote connection module or a local PC/laptop
computer as detailed in the following drawing.
Always observe the following safety instructions:

Connections must be made only in the complete absence of line voltage.

If over-voltage is expected, overvoltage arresters should be installed.

Use only a safety-certified power supply with dual insulation between the primary and output for
powering the unit. The power supply output rating must be limited to 18-32 Vdc, 1A for a single
Rosemount 5708, and not to be connected to a DC distribution network.