Technical data

Example of filling in the DX 0
screen form
You want to assign parameters in DX 0 to achieve the following system
program response (different from the defaults).
- in multiprocessor operation, the CPU for which this DX 0 is
programmed does not wait until the other CPUs have completed their
restart procedure,
- the cycle monitoring time is 100 ms,
- arithmetic operations are performed with 24-bit floating point
mantissa,
- if cycle errors occur, the CPU does not go to the STOP mode if OB 26
is not loaded,
- the user program is interrupted at operation boundaries by all
interrupts.
To obtain these reactions, complete the screen form as follows:
First DX 0 screen form:
- Select the "synchronize multiprocessor restart" parameter with
function key F3 as NO.
- For the "cycle time monitoring" parameter, press function key F3 and
then type in the number 10 (= 100 ms).
- Select the "24-bit mantissa" for the "accuracy of floating point
arithmetic" parameter with function key F3.
- Press function key F6 (CONTINUE). The second DX 0 screen is then
displayed.
Second DX 0 screen form:
- Select NO for the "cycle error" parameter with function key F3.
- Enter the number ’2’ in the "mode" field of the "interruptability of
user program by interrupts" parameter (= all interrupts at operation
boundaries).
- Confirm your entries by pressing the enter key. Data block DX 0 is
now generated by the PG software.
Finally, transfer DX 0 to memory or to an EPROM submodule.
Examples of Parameter Assignment
CPU 928B Programming Guide
7 - 18 C79000-B8576-C898-01