Orbit Merret OM PROFI, User Manual

Page: 11 / 16

USER MANUAL OM PROFI | 11
DESCRIPTION
OF COMMUNICATION
2.
3. Inserting and projecting integer number (signed long 4 byte) to OM xxx instrument through function „30“.
Number is sent to OM xxxRS instrument where the value is received and processed:
Recalculates with the set minimum and maximum,
May be recalculated with linearisation table, Mathematic function
evaluates limit statuses, sets the analog output,
projects the value in relevant format,
allows for changing the display colour in relation to value significance
The value stays projected in the instrument until another value is recorded or the instrument switches off.
2.2.6c
DOWNLOADING OF OM XXX INSTRUMENT IDENTIFICATION
Function „128“ enables to find out the identification of a connected OM xxx instrument with currently set
address. Identification is filled in under „Response OM xxx/Data“. Identification is obtained upon initialisation
after supply switch-on.
2.2.6d
DOWNLOADING OF SW IDENTIFICATIONS OF OM PROFIBUS CARD
Function „132“ enables to find out the SW identification of OM Profibus card
e.g.: „V.1.1.2 - 11/16/07 16:47:20(B737)“ In brackets there is the check sum of the OM Profibus card program
memory
Identification is filled in under „Response OM xxx/Data“.
2.2.6e
DOWNLOADING OF CHECK SUM OF THE EEPROM, STORED PARAMETERS OF OM PROFIBUS CARD
Function „133“ enables to find out the check sum of EEPROM memory, in which the OM Profibus card param-
eters are stored.
This function together with function „132“ always has to return the same information. In case the information
value changes, it is not certain the the OM Profibus card will function properly.
Check sum shall be filled in under „Response OM xxx/Data“.
2.2.6f DOWNLOADING OF COUNTER STATUS
Function „134“ enables finding out the service counters‘ statuses (number of switch-ons and total running time)
The counters status is filled in under „Response OM xxx/Data“. E.g.: „000012;000006“
2.2.7
WORKING WITH OM PROFIBUS CARD PARAMTERS IN EEPROM
The card retains several parameters affecting communication via RS 485. These parameters are listed in the
table abpve.
The parameters may be changed, however, from manufacture they are set for optimum values for communica-
tion with OM xxx instruments. Parameters may be downloaded by entering address under „Fu EEPROM
Address“ and downloading from „Value from EEPROM“ or by using function „131“.
The change is porformed by recording the new value under „Value to EEPROM“ and by storing an address by 128
higher to „Fu EEPROM address“. After the completion of recording the value into the EEPROM please
check that the value has been recorded correctly by reading out the „Value to EEPROM“. If all is correct, the
„Fu EEPROM address“ needs to be set to a number <128