Siemens UM344-2 user manual Network for Non-Hazardous Locations See 250

UM344-2								INSTALLATION
Network for Non-Hazardous Locations					See
		250			Note 3
		See	Network					MXC
		Note 2			See Note 6
			Junction
Controller,	+
Recorder, or Other
1-5 Vdc Device;
See Note 1	_
System Power	+				Signal		Test
Supply	_		See Note 5			_		_
					+		+
			See Note 4
					Model 344
					Terminals
See
Note 3
	MXC	250	Non-Hazardous	Hazardous
		See	Location	Location	See Note 6
		Note 2

Controller, + Recorder, or

Other 1-5 Vdc

_

Device; Note 1

System Power	+
Supply	_

See Note 4

		See Note 5
	Signal	Test
Supply and	+ _	+ _
Return Barriers
Shown Above

Network for Hazardous Locations	Model 344
	Terminals

Notes:

1.The System Power Supply is shown separate from the host input device. In practice, it may be part of the host input device. The host input device can be either a HART or non-HART signaling device, a Primary Master or a Secondary Master.

2.Network resistance equals the sum of the barrier resistances and the current sense resistor. Minimum value 250 Ohms; maximum value 1100 Ohms.

3.Connect the MXC (a Secondary Master) to the loop only in the non-hazardous location. The MXC is a non-polar device.

4.Interconnect all cable shields and ground only at the power source.

5.For access to Model 344 terminals, remove shorter end cap.

6.Maximum loop cable length calculated by formula in Section 4.3.5.

X02866S1

September 1995 4-5