KROHNE BM 90 EN - Manual (Page 16)

16
3.3. Security code
The Level-Sonic BM90 programme includes security
code protection. Any operator can display the value of a
parameter, but any attempt to enter a new value or per-
form a test will result in the security code being request-
ed.
The security code is requested by the prompt of ’COdE’,
if the code is not entered correctly this prompt is re-dis-
played.
Once the code has been input correctly, it will not be
required again whilst the system remains in the ’PROG’
mode. The factory set value is 9753.
A new "customer’s" security code, comprising 4 numeri-
cal digits, can be entered via Pr.96, providing the opera-
tor is in programme mode. The range of acceptable
values is 1000 to 9999. If an invalid code is entered, the
instrument will default to a code number 9753.
The code number is scrambled immediately on entry.
If you forget your security code ring your supplier for
advice quoting the number stored in Pr.96..
3.4. Application programming
The programming of Level Sonic BM90 is controlled by
the parameters summarised and listed later in this chap-
ter. Programming is easy to follow because the parame-
ters available to the programmer fall into distinct groups:-
Pr. 1 - Pr.6 Basic set up
Pr. 8 - Pr.22 Relays 1 to 5 designation and settings
Pr.23 - Pr.29 Failsafe operation
Pr.30 - Pr.34 Set the analogue output
Pr.37 - Pr.39 Temperature compensation
Pr.40 - Pr.44 Volume conversion
Pr.45 - Pr.50 Open Channel Flow Metering
Pr.51 - Pr.57 Specialised Pump Control
Pr.68 - Pr.70 Select echo detection and processing
Pr.71 - Pr.74 Miscellaneous
Pr.75 - Pr.78 Test Parameters
Pr.95 - Pr.96 Number Stores
Pr.97 - Pr.99 Resets
It can be seen from the above which distinct groups of
parameters need to be considered for a particular appli-
cation. For instance, in an application to measure level,
it may be necessary to consider only Pr.1 to Pr.29 which
are relative to basic set-up, relays and failsafe.
It is good practice to carry out a programme reset on a
new application before starting programming as this will
return all parameters to factory defaults and any parame-
ters which are not required for the new application will
remain at default, ensuring that the programme runs cor-
rectly.
Default values for each parameter are shown in the para-
meter definition , Section 3, and in the Parameter Setting
table, Page 43.
3.5. Programming
The following is the programming sequence to set up a
unit for operation. If you have not done this before, refer
back to chapter 1 "Initial start up Level-Sonic BM90".
1. Calculate the correct values
From the information contained within this manual
and the knowledge of the application, produce on
paper the correct values for the parameters required
(use page 36 Programming sheet).
To help you with this, see the examples on pages 27
to 32. Details of all the parameter options are listed
on pages18 to 26.
2. Sequence to enter a new program or modify
the existing one
l Press ‘MODE‘. When display shows "Prog" press ‘1‘
and then press ‘DSP‘ followed by ‘ENT‘.
l Display will show COdE and security code must be
entered (factory default is 9753. For a new code see
chapter 3.3).
l The display will now show the value of Pr.01 or the
last Pr. number used indicating that the correct secu-
rity code has been entered.
If the unit is being programmed for a new application it is
recommended that all parameters are reset to the factory
programmed values as follows :
l 1. Display Pr.99
l 2. Press ‘DSP‘ to show ‘====‘
l 3. Press ‘CE‘ to obtain a clear display
l 4. Press ‘ENT‘ and the display will show ‘P.rES‘,
then ‘t.rES‘ and then ‘====‘
l 5. Press ‘DSP‘ and enter Pr.01
l 6. Press ‘DSP‘ to display the value of Pr.01.
If a modification is being made to an existing program
then the sequence re-commences here.
l
The new values for any parameter should be input,
checking that the value is stored correctly. The para-
meters can be accessed in series using ‘ s ‘ and ‘ t ‘
keys or individually by entering the required parame-
ter number.
l Before entering the ‘RUN‘ mode, the program can be
checked by pressing Pr.78, then DSP , then ‘ENT‘.
Level-Sonic BM90 will now simulate the operating
program providing display, analogue output and relay
functions.
CAUTION :
All Level-Sonic BM90 outputs will work under simulation,
so ensure that external connections will not cause dam-
age.
l Press ‘CE‘ to leave simulation.
l Press ‘TEST‘ to freeze and unfreeze simulation.
l When the program is complete and does not require
further modification press ‘MODE‘ to return to the
‘RUN‘ condition.