4 System variables
20
4.2 Output variables
The output variables are used to transfer the values generated in the ST module to the device.
The output variables are available for configuration in the setup program and in the selectors (analog
selector or digital selector) on the device, and can be used individually.
For certain output variables there are associated variables in the variable window with the designations
"...conf" and "...sec". These variables can be used to implement a defined behavior in the ST code in the
event of an error.
•The variable "...conf" can be set in the ST code to decide which value the corresponding output
variable will accept in case of an error: FALSE = current value; TRUE = replacement value.
Default setting: FALSE
•The variable "...sec" contains the replacement value; it can be set to a certain value or to the default
value in the ST code.
In case of REAL variables, the replacement value is checked for compliance with the scaling limits.
If it is outside the limits, the default value is used (math error value 5.0E+37).
The SET_DEFAULT function is available for setting the default value.
chapter 8.9 "Other functions", page 46
bool_out
Error control
(runtime error, calculation error)
Error
no yes
no yes
= TRUE...conf
Check the „...conf“ variable
Output
the current value
Output
the current
value
Output
the „...sec“
variable
Designation Designation in the setup
program and on the device
Description
bool_out01
...
bool_out40
ST digital output 1
...
ST digital output 40
Boolean output variables; flexible use in the setup
program and on the device (digital selector)
A description text can be assigned to each variable
in the setup program.
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