705-5100-F21 datasheet(38/52 Pages) MAGNETROL

38 / 52 page

57-645 Eclipse Guided Wave Radar Transmitter - PROFIBUS PA™

7.1.3 Error Mapped to Diagnosis (cont.)

Note that PV status for Interface and Volume process vari-

bles may indicate a configuration error if the correct

Measurement Type has not been selected. In this case,

“Configuration not valid” will not be set in the DIAGNO-

SIS parameter since level measurement may still be correct.

Also, a Default Parameters Fault is indicated after a Factory

Reset which will result in the DIAGNOSIS indication

“Configuration not valid”.

7.1.4 PROFIBUS PA

TM Segment Checklist

There can be several reasons for a PROFIBUS PA™ installa-

tion to be in a faulty condition. In order to assure that com-

munication can be established, the following requirements

must be met.

• Device supply voltage must be higher than 9 VDC with a

maximum of 32 VDC.

• Total current draw of a given segment cannot exceed the

rating shown on the power conditioner and/or barrier.

• Device polarity must be correct.

• Two 100

Ω, 1 µF terminators must be connected to the

network—one at each end of the segment.

• Cable length plus spur length must not exceed the following

values:

• The cable shield is to be hard grounded only at one point

close to the DCS. In addition, the cable shield can be

capacitively grounded in multiple places to improve EMC

protection.

If all of these requirements are met, a stable communication

should be established.

Number of Spurs

1 Device

2 Devices

3 Devices

4 Devices

25–32

—

19–24

100 ft. (30 m)

—

15–18

200 ft. (60 m)

100 ft. (30 m)

—

13–14

300 ft. (90 m)

200 ft. (60 m)

100 ft. (30 m)

—

1–12

400 ft. (120 m) 300 ft. (90 m)

200 ft. (60 m)

100 ft. (30 m)

Pair

Shield

Twisted

Size

Length

Type

Single

Yes

AWG 18 (0.8 mm2)

6,200 ft. (1,900 m)

Multi

Yes

AWG 22 (0.32 mm2)

3,900 ft. (1,200 m)

Multi

Yes

AWG 26 (0.13 mm2)

1,300 ft. (400 m)

Multi

Yes

AWG 16 (1.25 mm2)

650 ft. (200 m)

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