Siemens Pacemaker UM344-2 Bedienungsanleitung PDF herunterladen (Seite 19)

XTC COMMUNICATOR UM344-2

September 1995

2.3 LOOP CONNECTION

The MXC is quickly connected into a transmitter loop. A 40" (1m) cable with a dual banana plug on one

end and two mini-grabber clips on the other is provided. The dual banana plug is inserted into the bottom

of the MXC. The mini-grabber clips are connected to the Model 344's signal terminals or to the loop's

current sense resistor, usually at a receiving instrument such as a Model 352 Single-Loop Digital Controller

(see notes below). This is a non-polar connection. The MXC can now communicate with the transmitter

from the control room or a field location. The diagram below shows a basic loop with the MXC connected

at various locations.

NOTE

The HART protocol requires a network (loop) resistance between

250Ω and 1100Ω to support communications. See Section 4.3.5 to

determine resistance value.

IMPORTANT

In a hazardous area installation, connect the MXC on the safe side

of the barrier, between the current sense resistor and the barrier.

MXC

Controller,

Recorder,

Indicator,

or other

Device

Notes:

1. Connect an MXC to any of the locations shown.

2. Connect the MXC only in a non-hazardous area.

Current Sense

Resistor, 250 to

1100 Ohms

Signal Test

Model 344

Terminals

X02849S1

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Siemens Pacemaker UM344-2 Bedienungsanleitung Seite 19