Siemens SIMATIC S7-300 Series Reference Manual page 157

CPU 312 IFM and 314 IFM: Erasing the integrated EPROM
If you wish to erase the contents of the integrated EPROM, proceed as follows:
1. Open a window with an Online view of the opened project via menu command
View Online, or
"
open the Online nodes window per click on the Online nodes in the function
bar, or select the menu item PLC
2. Select the MPI number of the target CPU (double-click).
3. Select the Function Block container.
4. Select the menu item Edit
5. Then select the menu item File
the selected blocks from the target memory.
6. Select the MPI number of the target CPU.
7. Select the menu item PLC
This command deletes all blocks online and overwrites the EPROM with the blank
contents of the RAM.
SFB "DRUM" - Reversed Bytes in Output Parameter OUT-WORD
With the SFB "DRUM", the following CPUs return the value with reversed bytes on
the output parameter OUT_WORD.
CPU 312 IFM up to
CPU 313
CPU 314
CPU 314 IFM up to
CPU 315
CPU 315-2 DP up to
CPU 316
The result is the following assignment, with reference to output parameter OUTj,
0vjv15:
OUTj, 0vjv15:
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
" Show online nodes.
" Mark all.
" Delete, or press the DEL key. This deletes all
" Copy RAM to ROM.
6ES7312-5ACx2-0AB0, firmware V 1.0.0
up to 6ES7313-1AD03-0AB0, firmware V 1.0.0
up to 6ES7314-1AEx4-0AB0, firmware V 1.0.0
6ES7314-5AEx3-0AB0; firmware V 1.0.0
up to 6ES7315-1AF03-0AB0, firmware V 1.0.0
6ES7315-2AFx2-0AB0,
up to 6ES7316-1AG00-0AB0
j = 7 .... 0
j = 15 .... 8
7 6 5 4 3 2 1 0 15 14 13 12 11 10 9
Tips and Tricks
8
OUT_WORD
5-3