Siemens SIMATIC S7 System Manual page 559

EEPROM
When the "EEPROM" input is turned on, the instruction writes to both the RAM and the
EEPROM of the drive. When the input is turned off, the instruction writes only to the RAM of
the drive.
NOTICE
Do not exceed the maximum number of write cycles to the EEPROM
When you use an USS_WPM_x instruction to update the parameter set stored in drive
EEPROM, you must ensure that the maximum number of write cycles (approximately
50,000) to the EEPROM is not exceeded.
Exceeding the maximum number of write cycles will result in corruption of the stored data
and subsequent data loss, and possible property damage. The number of read cycles is
unlimited.
Do not exceed the maximum number of write cycles to the EEPROM.
USS_RPM_x and USS_WPM_x example program
Table 9- 38 USS_RPM_x and USS_WPM_x example program
Network 1
Network 2
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Network 1
LD M10.5
= L60.0
LD M10.5
EU
= L63.7
LD L60.0
CALL USS_RPM_W, L63.7, 0, 5, 0, &VB20,
M1.1, VB10, VW12
Network 2
LD M10.6
= L60.0
LD M10.6
EU
= L63.7
LDN SM0.0
= L63.6
LD L60.0
CALL USS_WPM_W, L63.7, L63.6, 0, 2000, 0,
50.0, &VB40, M1.2, VB14
Libraries
9.5 USS library
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