Siemens SIMATIC S7-200 System Manual page 354

S7-200 Programmable Controller System Manual
Table 11-5 Valid Operands for the USS_WPM_x Instructions, continued
Inputs/Outputs
Done
Error
Caution
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. The number of read cycles is unlimited.
If frequent writes to the drive parameters are required, then you should first set the EEPROM
storage control parameter in the drive to zero (for MicroMaster 3 drives) and turn off the
EEPROM input for MicroMaster 4 drives.
Example: USS_RPM_x and USS_WPM_x
340
Data Type Operands
BOOL I, Q, M, S, SM, T, C, V, L
BYTE VB, IB, QB, MB, SB, SMB, LB, AC. *VD, *AC, *LD
Network 1 //The two contacts must have the
//same address.
LD I0.0
= L60.0
LD I0.0
EU
= L63.7
LD L60.0
CALL USS_RPM_W, L63.7, 0, 3, 0, &VB100,
M0.0, VB10, VW200
Network 2 //The two contacts must have the
same address
LD I0.1
= L60.0
LD I0.1
EU
= L63.7
LDN SM0.0
= L63.6
LD L60.0
CALL USS_WPM_W, L63.7, L63.6, 0, 971, 0, 1,
&VB120, M0.1, VB11