Siemens SITRANS P User Manual download pdf (Page 67)

UMSITRPDS3-1 Installation

November 2010

4-15

- +

4-20 mA

MG00351a

Hazardous

Location

Non-Hazardous

Location

Network

Primary

Master

See Note 1

Transmitter 1

See Notes 3 & 6

250

See Note 2

See Note 4

See Note 5

System

Power Supply

Transmitter 2

See Notes 3 & 6

Transmitter 15

See Notes 3 & 6

- +

4-20 mA

- +

4-20 mA

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 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 is

250 Ohms; maximum value is 1100 Ohms.

3. A maximum of 15 transmitters may be connected. All must be configured for digital mode.

4. Connect the HART Communicator as shown in Figure 2-2 for hazardous or non-hazardous locations. The HART

Communicator is a non-polar device.

5. Supply and return barriers are shown. Interconnect all cable shields and ground only at the barriers.

6. For access to transmitter field terminals, remove the enclosure cap.

FIGURE 4-9 Multi-Drop Network (Digital Mode)

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 221 222

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Siemens SITRANS P User Manual Page 67