Siemens SIMATIC S7-200 System Manual page 441

8. Ramp down time(s) (optional). This is the time in seconds that it takes the
motor to decelerate to a complete stop. Press the P key. Press the up or down
arrow key until P003 appears. Press P to enter the parameter. Press the up or
down arrow key until the display shows the ramp down time you want. Press P
to enter.
P003=0-650.00
9. Serial Link Timeout. This is the maximum permissible period between two
incoming data telegrams. This feature is used to turn off the inverter in the
event of a communications failure.
Timing starts after a valid data telegram has been received. If a further data
telegram is not received within the specified time period, the inverter will trip
and display fault code F008. Setting the value to zero switches off the control.
The time between the status polls to the drive can be calculated using
Table 11-1.
Press the P key. Press the up or down arrow key until P093 appears. Press P
to enter the parameter. Press the up or down arrow key until the display
shows the serial link timeout you want. Press P to enter.
P093=0-240 (0 is default; time is in seconds)
10. Serial Link Nominal System Setpoint. This value can vary, but will typically
correspond to 50 Hz or 60 Hz, which defines the corresponding 100% value
for PVs or SPs. Press the P key. Press the up or down arrow key until P094
appears. Press P to enter the parameter. Press the up or down arrow key until
the display shows the serial link nominal system setpoint you want. Press P to
enter.
P094=0-400.00
11. USS Compatibility (optional). Press the P key. Press the up or down arrow key
until P095 appears. Press P to enter the parameter. Press the up or down
arrow key until the display shows the number that corresponds to the USS
compatibility you want. Press P to enter.
P095 = 0
12. EEPROM storage control (optional). Press the P key. Press the up or down
arrow key until P971 appears. Press P to enter the parameter. Press the up or
down arrow key until the display shows the number that corresponds to the
EEPROM storage control you want. Press P to enter.
P971 = 0
13. Operating display, Press P to exit out of parameter mode. P
S7-200 Programmable Controller System Manual
A5E00066097-02
Using USS Protocol Instructions to Communicate with Drives
0.1 Hz resolution (default)
1 0.01 Hz resolution
Changes to parameter settings (including P971) are lost when
power is removed.
1 (default) Changes to parameter settings are retained during
periods when power is removed.
11-19