Advertisement
7.3
Accessing Support Functions
Support Functions
10–13 – P/C
Restarts
Function 14 –
Watchdog Timer
SIMATIC VPU200/565 Programming Manual
To initiate one of the functions, type the number of the desired function next
to the prompt on the screen of the VPU200. Then press the Return key to
begin the function. The system will prompt for more information if it is
needed. To leave the SUPPORT function, press the ABORT (F1) function
key.
These four functions are used to reset (or restart) the P/C. Each of the four
functions clears a certain portion of memory. (A "cleared" memory is one in
which all values are set to zero.) The following describes which portions of
memory will clear for each of the functions:
Function 10 (Power-up Restart) clears all discrete registers (that is, the
registers for X, Y, and C elements) except those which are forced. The word
registers (WX and WY elements) will not be affected. Note, however, that if
the battery is low or missing, all registers including forced and word
elements will be cleared, as well as ladder logic, memory configuration and
I/O configuration.
Function 11 (Partial Restart) clears all discrete registers except
retentive-C and forced elements. The word registers and presets will not be
reset to zero.
Function 12 (Complete Restart) clears all discrete registers (including
retentive-C elements). Forced elements and word registers will not be reset
to zero.
Function 13 (Clear P/C) places the P/C in program mode, sets the scan to
50 milliseconds, and clears all memory locations including the ladder logic
program.
After the number of the function is entered by pressing the Return key, the
screen will repeat the name of the function and ask whether you are sure
you wish that function performed.
If you press the F1 (NO) function key, the system will abort the selected
function and return to the screen which shows the menu for the support
functions. If you press the F2 (YES) function key, the system will begin the
requested function. When the requested function is complete, the system
will return to the menu showing the available support functions.
Function 14 (Watchdog Timer) allows you to set and read the timer. The
timeout range that may be entered from the VPU is from 0 to 32767
milliseconds. (However, the minimum timeout supported by the P/C is 500
msec.) When the Watchdog Timer function is selected, the function keys
available are displayed, along with the watchdog timer value. The Support
Function menu remains in the upper part of the display.
Using Support Functions
7-5
Advertisement
Chapters
