Siemens SIMATIC S5 Equipment Manual page 113

Technical Specifications
5. Modifying Setpoints
The transfer of a setpoint for each parameterized initial or end value takes
8 msec x 32 (maximum initial values for 2 channels)
8 msec x 32 (maximum end values for 2 channels)
- - -
6. Zero Shift (Incremental Encoders)
For a zero shift (i.e., synchronization of the module), a certain time period per channel is required
for updating the result bits. This time requirement for each specified initial or end value (consider
parallel operation) is
7. Special Functions
Activation of the "verify–read" and "calculate average value" special functions increases time
requirements as shown below.
Verify-read
Calculate average value
8. First Start-Up (Worst Case)
For a complete start-up the worst case conditions apply. Time from turning on the power supply
until the interrupts and track identifier bits are correctly set:
a) maximum time required for parameter assignment
8 msec x 32 initial values
8 msec x 32 end values
b) maximum time required for binary/BCD conversion
13 msec x 32 initial values
13 msec x 32 end values
— --
These time characteristics must be considered during configuring.
8 – 6
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100 WS x number of "incorrect" read procedures @
100 ps x number of actual values for
"calculate average value" @
R 02/92
8 msec
= 256 msec
= 256 msec
- - - - - - -
= 512 msec
1 msec
= 256 msec
= 256 msec
= 416 msec
= 416 msec
Worst case X = 1344 msec
AG 1989, Order No.: 6ES5 998-0KD21