Limit Value Monitoring - JUMO LOGOSCREEN 601 Operating Manual

7 Configuration
Formula as text, Formula Editor
Pressing the "Formula Editor" button opens an editor that can be used to create formulas by selecting
variables and operators (max. 600 ASCII characters). Formulas can be entered freely in line with stan-
dard mathematical rules. Any number of spaces may be used within the formula symbol string. Spaces
are not admissible in function designations, names of variables, or constants.
NOTE!
The trigonometric functions (SIN, COS, and TAN operators) use degrees (360).
Error handling
The following circumstances may arise:
Process value of math
function
None (math function in-
active)
No error value
Error value
Error value
Status after change of configuration
Modified parameters are incorporated immediately.
Behavior after power on
If the "Save using power off" function is not active, all math values are set to 3.0E+37 and the calculation
is restarted.
7.16.1

Limit value monitoring

Limit value monitoring with one or two limit values (alarm 1, alarm 2) can be activated for the results. In
out-of-limit cases, an alarm signal is activated. Depending on the configuration, an entry is made in the
event list or additionally in the alarm list. In the latter case, the alarm/event text is displayed in the status
bar (until another alarm occurs); the collective alarm is enabled, and the plotter trace may be displayed
in a different color.
This limit value monitoring function is independent of the general limit value monitoring values (Config-
uration > Limit value monitoring) and available in addition to them.
150
Configuration "Behav-
ior in the event of
fault"
Any
Any
Output error value
Output replacement val-
ue
Initial value of math
function
3.0E+37
Value of math function
5.0E+37
Replacement value
Binary value of math
function
0 (FALSE)
0 (FALSE)
1 (FALSE)
1 (FALSE)