ABB TB82PH Betriebsanleitung PDF herunterladen (Seite 9)

I-E67-TB82FF-2A February 13, 2002

. . . ELECTRICAL CONNECTIONS

To ensure fault-free communication, the bus must be

properly terminated at both ends. Only approved bus

terminators must be used for intrinsically safe circuits.

The specific noise immunity and emitted interference

are only guaranteed when bus screening is fully

effective (e.g., ensuring that screening is maintained

through any existing junction boxes.) Appropriate

equi-potential bonding must be provided to avoid

differences in potential among the individual plant

components.

Two hundred fifty-five addresses per segment are

allowed.

• Addresses from 0 to 15 are reserved for group

addressing and Data Link (DL) use.

• Addresses from 16 to 247 are reserved for devices.

• Addresses from 248 to 251 are non-visitor

addresses used as defaults for devices using address

assignments.

• Addresses from 252 to 255 are visitor addresses

used for temporary (handheld) devices.

The number of transmitters or devices that can be

connected to a bus is also dependent on the

transmitters’/devices’ power consumption, the type of

cable, number of spurs, total cable length of the bus,

and intrinsically safe requirements.

The table below lists some considerations that have

been identified by the FOUNDATION Fieldbus

Organization.

Parameters Specification

Data Rate 31.25 Kbits/s

Type Voltage

Topology Bus/tree

Bus Power DC

Intrinsically Safe No Yes

Max Nr of devices (1) 32 6

Max cable length (2) 1900 m

Max spurs length (3) 120 m

Notes:

1) The number of devices is dependent on several

physical parameters (e.g., power consumption, bus

cable, device IS parameters, etc.).

2) Length includes bus and all spurs lengths.

3) The maximum Spur length with one device is 120

m; 30 m less for each addition device.

For further information on FOUNDATION Fieldbus

installations, see Supplementary Documentation list

at the beginning of this manual.

LOCAL HMI OPERATING PROCEDURES

The TB82EC Four-electrode Conductivity FF

Transmitter has seven main operating modes:

Measure, Calibrate, Output/Hold, Configure, Security,

Secondary Display and Utility. Within each mode,

several programming states containing functions

specific to the related mode are available.

Using a patented HMI, programming or accessing

information from the transmitter’s front panel is quick

and easy. The LCD contains nine regions that

provide the user with information on the process

variable, engineering units, mode of operation, fault

indication, secondary variable, and function key

assignment (see Figure 2). The primary process

variable is displayed in the three and one-half digit

region. The Engineering Unit region supports this

region. These display regions are active in all modes

of operation; however, some programming states also

use these regions for data entry.

The secondary variable is displayed in the six-

character region. This display region is used for

displaying secondary and fault information in the

Measure Mode of operation and textual prompting in

all other modes of operation.

Due to the limited number of characters supported by

the secondary display, many of the prompts take the

form of a text abbreviation (see Glossary of

Programming Text Prompts for a list of abbreviations.)

The secondary display region is active in all modes of

operation.

A five-button, tactile keypad is located on the front

panel of the instrument. Four of the buttons are

embossed to easily show their location. A fifth,

hidden button located at the top, center of the keypad

provides access to functions that are infrequently

used. The embossed keys do not have a pre-

assigned function. Icons are energized over the key

to indicate their function. If a key does not have an

icon energized above its location, this key does not

have a function and will not initiate an action when

pressed. The first table below lists all key functions.

The Measure Mode is the normal operating mode of

the transmitter and is the default mode upon power-

up. The Measure Mode is the starting point for entry

into other modes of operation. Each mode contains a

unique set of transmitter functions or states. These

modes and their related functions are listed in the

second table below.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 59 60

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