KROHNE BM 702 HART - Manual (Page 5)

KROHNE Messtechnik GmbH & Co. KG · Ludwig-Krohne-Str. 5 ! D-47058 Duisburg 5/10
Tel.: 0203-301 0 ! Fax: 0203-301 389 · e-mail: [email protected]
Remote Operation Instructions BM 70 A/P, BM 700, BM 702 HART
For installing the DD with the Installation Kit refer to the “AMS User's Guide” section 3:”Managing HART Devices” /
“Adding new Device Types to AMS” / “Install Device Types Manually”.
5.2 Operating
Refer to the BM70 A/P /700 /702 Menu Tree AMS (Attachment B).
Due to AMS requirements and conventions the BM 70 X operation differs a little from operation with HC275 and via
local keypad.
The online help of each parameter contains its function number as a reference to the device’s local display and the
“Installation and Operating Instructions”.
Parameter protection via passwords (Entry Code, Service Code) is the same as on local display. Please refer to the
online help for valid symbols according to device’s keypad.
Some additional comments follow:
•
To “open” service functionality the user has to register as specialist. To do this, one should invoke the “Service
Code” method from the Device Context Menu and enter the correct service password. Note, that after the Device
Connection View is reopen (or the same method is invoked with improper service password) specialist
authorization is lost, and all service parameters/functions (trim PV current DAC zero/gain) again become
inaccessible.
•
Opposed to the HC275, handling of Conversion Table via AMS is carried out directly from the three configuration
displays. Due to transmitter implementation peculiarities some steps should be sequentially undertaken to create
or change the table. The matter is that all the changes in table elements are initially accumulated in instrument
RAM. The trigger event that launches the table’s burning into EEPROM, is Command #141 (Write Conversion
Table Point Number) that deals with a single parameter, being the ‘Number of points’ variable (configuration
display “Strap Table, 1-20”). Just this command initiates the check of complete table and in case ‘twas successful
– activates the burning procedure. Worth noting that as soon as every table point depends on the ‘Number of
points’ variable (in terms of VALIDITY clause), the latter is always written to instrument before the points’ set.
Hence while augmenting table the user can be prompted “Error ‘Table not monotonous’ happened writing
‘Number of points’”. Only after this response the table (changed elements) is copied to the instrument RAM. To
burn it into EEPROM one have to “change” again the number (say, 10 to 10, or 4 to 4) and press ‘Apply’ again.
All the commentaries above can be summarized as follows:
1. If the number of points is changed (with or without changes of the table contents), the user should ignore
the first possible error response after pressing ‘Apply’ (‘Table not monotonous’ happened writing ‘Number of
points’), “change” the number of points again to desirable one (i.e. reenter exactly the same value) and again
press ‘Apply’.
2. If the number of points is preserved but some table items are changed, the user should press ‘Apply’ (thus
transferring changed items to device), then reenter the number of points (as above) and press ‘Apply’ again -
otherwise the updated point(s) will be “in play” until the first power reset.
•
While transferring configurations (various transfer types are possible here - between live instruments; some
stored configuration and live device; two offline configurations – say, between HC275 and AMS; etc.) one should
bear in mind that the ‘Transfer the device configuration’ buttons on the reconcile views (the “<<”, “>>” buttons to
the left of “OK”-button) are available only in case the devices/configurations are in one and the same transmitter
mode (refer to Attachment C). Otherwise the buttons are grayed and display the mode of corresponding
configuration (say, “/0”, “/6” will imply that the left-hand configuration was stored (or corresponds to connected
instrument) when device was in ‘0’ mode whilst the right-hand – in ‘6’th. In case of different configurations’ modes
only partial transfer is possible when the accessible (not grayed) parameters are transferred individually. Worth
noting that “relocatable” parameter set depends on how severe corresponding modes differ. Moreover – the
mode-driven restrictions might have some intermediate/secondary effect: say, transfer of enumerator of some
“wide” configuration (e.g. any corresponding to BM 70 A) to a “narrow” one (e.g. any of BM 702) can lead to a so-
called ‘Unknown enumerator’ situation (when transferred value is replaced with ‘**********’ in configuration-
“receiver” due to restrictions of any kind – e.g. “Agitator” setting for ‘Tank type’ is possible only for BM 70 A but
not for any other device type/modes). Such wrong enumerators will be (for sure) rejected being applied to a live
instrument (i.e. when configuration-receiver is connected device), but are accepted by some preserved
configuration (in User Configurations view, etc.). Hence it is recommended for the user to use the online help for
every transferred parameter in case the two configurations represent different transmitter modes!
•
The Dynamic Variables mapping (to the sole/primary current output and the three logical slots) can be controlled
for this revision from the “Device/HART” configuration tab. One note should be mentioned here: when the