Siemens Pacemaker UM344-2 Manuel d'utilisateur télécharger pdf (Page 37)

UM344-2 INSTALLATION

September 1995

Ÿ Determine conduit routing. Refer to Section 4.4.5.

Ÿ Prepare installation site drawings showing the following:

Ÿ Location of the Master Device (e.g. MXC or controller)

Ÿ Location and identification of each Transmitter

Ÿ Routing plan of signal cable(s)

Ÿ Location of any signal cable junctions for connecting the MXC

4.3.2 Electrical

Ÿ Determine Transmitter operating mode (analog or digital) and type of Network needed; refer to

Section 4.3.3.

Ÿ Determine minimum power supply requirements. Refer to Section 4.3.4.

Ÿ Select twinaxial cable type and determine maximum cable length. Refer to Section 4.3.5.

Ÿ Determine the need for network junctions. Refer to Section 4.3.6.

Ÿ Intrinsically Safe installations will need barriers. Refer to Section 4.3.7.

Ÿ Consider the effect of connecting additional equipment (e.g., recorder, loop powered display) to the

network. Refer to Section 4.3.8.

• Select sensor cable type. Refer to Section 4.3.9.

• Consider the accuracy limitation of a 2-wire RTD. Refer to Section 4.3.10.

• Read Section 4.3.11 for grounding and shielding recommendations.

4.3.3 Transmitter Operating Mode and Network Type

A Transmitter will output either an analog current or an equivalent digital signal, depending upon the

selected operating mode. The operating mode also determines the type of Network (Point-To-Point or

Multi-Drop) to be installed, as shown in Table 4.1 and the following subsections. Select the operating

mode during Transmitter configuration as described in the following subsections and Section 5.

TABLE 4.1 Operating Mode and Network

OPERATING MODE NETWORK TYPE NETWORK FIGURE(S)

Analog Point-To-Point 4-1 and 4-2

Digital Multi-Drop 4-3

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 182 183

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Siemens Pacemaker UM344-2 Manuel d'utilisateur Page 37