KROHNE MFC 010 C Converter - Manual (Page 78)

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MFC010 Interface Manual
8.4 Concentration Measurement
Using the density and temperature measurement data the MFC010 is able to calculate the concentration
of a num ber of s tandard and us er def ined pr ocess m ixtures. T his ex tra facility must be purchased in
addition to the standard MFC010 software functionality. Consult the Optimass support team for details.
When the c oncentration f eatures ar e ena bled, t he us er w ill be pr ovided w ith a c omplete m anual t hat
covers all of t he as pects of c oncentration m easurement i n t he O ptimass s eries of s ensors. T his
concentration manual was written in relation to the MFC050 converter but can equally be applied to the
MFC010 as the functionality is the same. Along with the concentration manual the user will be provided
with a s oftware appl ication t hat w ill aut omatically c alculate t he r equired c oefficients f rom pr ocess data
supplied by the user.
To enable the concentration measurement the user must write the unique sensor specific password value
to H olding r egister num ber 7007/ 7008. (the value i s a l ong integer and s o m ust be w ritten as t wo
registers). The correct password value will be supplied by KROHNE upon purchase of the Concentration
option. The lockout operation of the Concentration password is the same as described for the Supervisor
passwords described below.
8.5 Using the System Protection Passwords
The M FC010 i s pr otected by a s eries of f eatures t o pr event ac cidental or inadvertent alteration of the
configuration and c alibration s ettings. T he “ Supervisor” pas sword, when activated, blocks all write
operations t o t he H olding r egisters. T he “ Service” pas sword, when ac tivated, w ill b lock a ll w rite
operations to any Holding register that directly affects the measurement values, principally the calibration
coefficients. Registers that are protected by the “Service Password” are indicated in the Holding Register
definitions with the  symbol, refer to Section 7.5.
The “Service” password is always active when power is first applied to the MFC010. It can be disabled for
2 minutes by writing the correct code to the “Service” password register, Holding register No 1002. The
status of t he “ Service” pas sword c an be det ermined by examining the c ondition of I nput B inary s tatus
register number 1002. If the password register is written to before the 2 m inute period of de-activation
expires, then the 2 m inute count will be restarted. The “Service” password is a fixed 16 bit code which
may be obtained if necessary from the Optimass product support team, refer to your supplier for details.
The “Service” password cannot be read from the Holding register, the MFC010 will return a “0” value when
the “Service” password register is read.
The Supervisor password is by default de-activated. I t can be ac tivated by writing an appr opriate 16 bi t
value t o t he “ Supervisor” pas sword r egister, H olding r egister N 0 1001. The s tatus of t he “ Supervisor”
password can be determined by examining the condition of Input Binary status register number 1001. To
de-activate the “Supervisor” password simply write the chosen password back to the “Supervisor”
password register. The password protection will become effective as soon as the password is written, but
the us er m ust r emember t o per form a “ Save t o E EPROM” t o ens ure t hat t he pas sword condition is
reloaded when the unit is next switched on. When activated the “Supervisor” password register will return
an encoded version of the password value when read. If the password is forgotten or otherwise
incorrectly recorded, the system can be unlocked by sending the encoded value to the Optimass product
support team who will provide the correct password value, refer to your supplier for details.
Writing an incorrect value to a password register on three consecutive occasions will result in a 10 minute
“lockout” of that register, i.e. subsequent writes to that register, whether with the correct password or not,
will be r ejected with an “ Illegal Function” error response. See Section 5.6 on page 22 for details of the
error response telegram formats.