DCS ADR24 Operations Instructions download pdf (Page 38)

38 VEGASON 51P … 53P

Electrical connection

5.2 Sensor address

In a Profibus system composed of Profibus

DP and Profibus PA subsystem, each partici-

pant must have a unique address. Each

participant, whether master or slave, is

accessed by means of its own address in

the bus system. The address of a partici-

pant, whether on DP or PA level, should be

assigned before connecting to the bus, be-

cause an address can be used only once. If

an address is used twice, interference will be

caused in the bus.

The address of an ultrasonic sensor can be

set in two ways:

- with the adjustment software VVO (soft-

ware addressing) or

- with the DIP switch block in the sensor

(hardware addressing).

VEGA Profibus sensors are dispatched with

the address set at 126 (all DIP switches to

"ON“).

Remember, in a Profibus system there are

max. 126 participants possible. When the

DIP switch is set to address 126 (or higher),

the address can be adjusted with the adjust-

ment software VVO, the adjustment module

MINICOM or another configuration tool (e.g.

PDM). However, there can be only one sen-

sor on the bus with address 126 (delivery

status) during address assignment via soft-

ware. For that reason, hardware addressing

(DIP switch) before connection to the bus is

recommended.

Hardware addressing

The DIP switches generate an address

number in the binary system. This means

that, from right to left (ascending), any switch

represents a number twice as high as the

previous switch on the right. The corre-

sponding number in the decimal system

results from the sum of all switches set to

"ON“. In the illustration you see the decimal

number that corresponds to each individual

DIP switch.

DIP switch 8 corresponds to the number 128,

switch 1 corresponds to the number 1 and

switch 3 corresponds to the decimal number

4.

4

16

64

64 + 16 + 4 = 84

87654

3

2

1

ON

1

2

4

8

16

32

64

128

87654

3

2

1

Example 1

The switches 3, 5 and 7 are set to "ON“. The

address is then:

DIP switch 3 to "ON“ means 4

DIP switch 5 to "ON“ means 16

DIP switch 7 to "ON“ means 64

4 + 16 + 64 = Address 84

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 83 84

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