Siemens MD-12HD, User Manual, Page: 48 / 74

47 Siemens Industry, Inc.
intends to restrict access to
“Read Only” by setting only this PIN unaware of the fact that the default PIN
still matches the criteria for “Read/Write” which will accidentaly promote the user. ViewPoint HD and the
MD-xxHD Web App disallow this condition, but remote programmers using direct register access may
create this condition.
Read Only Permission Register
Configuring the meter for a Read Only user allows data or configuration items to be viewed, but not
changed. This level of authorization might be appropriate for general end-users such as building owners
who may not be aware of the details of the installation. It is recommended to use ViewPoint HD to
configure permissions, although it is also possible to set up a Read Only PIN using the MD-xxHD Web
App if a Read/ Write PIN has already been entered (either through the LCD or the Web App itself).
Read/Write Permission Register
Read/Write permissions allow users to read and write configuration items and to reset the PINs. This level
of authorization will be required by any technician or user who needs the ability to correct setup errors in
the meter. The default PINs [
0000 ] allow new users to reset the Read/Write PIN from either the MD-xxHD
Web App or ViewPoint HD. Permissions cannot be set through the LCD interface.
Reading PINs over Modus
ViewPoint HD can be used to directly report the Read Only and Read/Write PINS under the Advanced
Tab (passwords). The value reported by ViewPoint HD is the value as entered in the web page or LCD
interface.
PINs are also accessible as registers, but are encoded so that reading the value of the register through
an RTU does not inform a user what the password is. This feature allows Siemens to support looking up
forgotten PINs, if network access is available.
ViewPoint HD
– Unrestricted Access
The ViewPoint HD software tool can be used to read & write configuration information to the meter
without entering credentials.
ViewPoint HD is the preferred tool for setting up access restrictions because it allows users to
test the function of the PINs without locking themselves out from the ability to change the PIN, a
frustrating catch 22!