Athena C10 line Manual de Instruções descarregar pdf (Página 16)

requested function. To evaluate the lapse in time for different functions

reference can be made to the following expressions:

Request:

T3TT

Lcs

≅

where:

= Elapsed time.

= Time of a character.

= Variable time from 0 to 10mS which is dependent on the internal

processes.

Assignment:

T3TTT

Lcsw

≅

where:

= Elapsed time.

= Time of a character.

= Variable time from 0 to 10mS which is dependent on the internal

processes.

= Multiple time of 25mS which is dependent on the number of bytes

to be written. For assignment of words, this time can be 0, 25 or 50 ms

depending on whether both one or none of the two bytes is equal to

the preceding value; for the assignment of bit T

it can be a value from

0 to 100mS.

5.3 Data Base

The ATHENA CONTROLS instrument variables available for serial

communication through the MODBUS protocol are contained in two

distinct sections: the bit zone and the word zone.

5.4 Bit Zone

The bit zone is made up of 16 addressable bits that contain information

on the functioning status of the instruments. With some instruments,

certain bits are not used; the status request for these bits with the 01 and

02 functions is permitted but returns a fixed value of 0; these bits are

indicated in the tables by the presence of a hyphen "-". The assignment

of the bit status with the 05 and 15 functions is only allowed on

addresses in which this is possible, which condition is indicated by "R/W".

5.5 Word Zone

The word zone is made up of 128 addressable words that contain control

variables and the instrument parameters. With some instruments certain

words are not used; the request for the values of these words with the 03

and 04 functions is permitted but returns a fixed value of 0; these words

are indicated in the table by the presence of a hyphen "-". The

assignment of the word value with the 06 and 16 functions is only allowed

on addresses in which this is possible, which condition is indicated by

"R/W". The variables and parameters are coded as integer numbers with

a plus or minus sign (two's complement) without taking into account the

decimal point in the representation (for example: the Proportional Band

displayed on the screen with a decimal digit "25.0" is transmitted as 250).

Assignment is only allowed within the values assigned to each

parameter, any attempt to assign a value outside of those permitted

within the field, will cause the instrument to respond with an error

message and a an exception code equal to 3, and the assignment will not

be carried out.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 106 107

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