Ahlborn ALMEMO 2590-2A Operating Instructions Manual page 50

12. Function menus
In the function Mode program the variant Monitor :
Fail-safe mode:
Fail-safe mode is suitable where purely software-based scanning is used merely
to ensure in the event of computer failure that scanning continues on an internal
cyclic basis. In this mode the cycle programmed in the device must be larger
than that needed for software scanning (e.g. device cycle 20s, software cycle
10s). Software scanning keeps resetting the internal cycle with the effect that
this cycle is only actually used as and when software scanning fails; (here too
in Win-Control ´safe initialization´ must be deactivated).
The internal cycle is started with the start of the Win-Control software; it may
also have been started previously. Scanning by the internal cycle outputs no
data to the interface. To accept data the memory must have been activated.
In the function Mode program the variant Fail-safe :
Output format
12.5.8.3
The output format (see Manual 6.6.1) defines the print layout for measuring
point scans and for output of the memory. This output format can be pro-
grammed in the function
all measured values are listed one below the other; there is also the ´Columns´
format listing them next to one another; this provides a clear, easy-to-under-
stand, and space-saving printout. The Table format is suitable for further pro-
cessing using a spreadsheet program; (see print layouts, Manual 6.1).
Output format ´ ´ List meas values one below the other : Output form : List
Output format ´n´ Columns next to one another :
Output format ´t´ Table, semi-colon separated :
In the data logger menu behind the cycle for memory activation ´S´, if not ´U´
The format is indicated by an abbreviation ´n´ or ´t´:
Measuring rate, continuous measuring point scan
12.5.8.4
As and when necessary the measuring rate (conversion rate) for measuring
point scans can be raised in the
(measuring operations per second) (see Manual 6.5).
Semi-continuous measuring point scan
The measuring rate for measuring points is by default semi-continuous; i.e. all
measuring points are continuously scanned but the selected measuring point is as-
signed preferred status and is rescanned every 2nd time. This ensures a constant
scanning rate (= half the measuring rate) irrespective of the number of measuring
channels; this is an advantage for analog output or measured value smoothing but
when averaging (M(n) it may lead to incorrect results.
Continuous measuring point scan
If continuous measuring point scanning is set, all active measuring channels
are scanned equally often at the chosen measuring rate and uninterruptedly one
50
. There is the default format ´List´ in which
Output form
Measuring rate
Mode:Monitor
Mode:Fail-safe
Output form: Columns
Output form: Table
Cycle timer: 00:15:00 Sn
function from 2.5 to 10 mops