Siemens Simatic ET 200S Operating Instructions Manual page 303

Calculation of the response time for IM151-1 COMPACT 32DI
The following equation enables you to make an approximate calculation of the ET 200S
response time:
Response time [μs] = 156 · m + 33 · do + 486 · ai + 374 · ao + 1633 · t + 1576
Parameters: as for IM151-1 BASIC
Calculation of the response time for IM151-1 COMPACT 16DI/16DO
The following equation enables you to make an approximate calculation of the ET 200S
response time:
Response time [μs] = 156 · m + 33 · do + 486 · ai + 374 · ao + 1633 · t + 1664
Parameters: as for IM151-1 BASIC
The example of the calculation of the ET 200S response time for IM151-1 BASIC applies
analogously for the COMPACT modules.
Calculation of the response time for IM151-1STANDARD and IM151-1 FO STANDARD
The following formula enables you to make an approximate calculation of the ET 200S
response time:
Response time [μs]* = 55 · m + 110 · a + 400 · t + 190
* Bus length parameter > 1 m: The response time increases by an additional 40%
Explanation of the parameters:
• m: Total number of all modules (power modules, digital electronic modules, analog
• a: Sum total of all analog electronic modules, 4 IQ-SENSE and 1SSI fast electronic
• t: Number of all technological modules (except 1SSI fast)
ET 200S
Operating Instructions, 12/2005, A5E00515771-03
electronic modules, 4 IQ-SENSE electronic modules, 4POTDIS potential distribution
module, RESERVE module, technological modules and motor starters)
modules
Note
The formula specified applies to cyclic data transfer. The following prerequisites must be
fulfilled:
• No diagnostics are reported.
• No modules are removed and inserted.
Response times
D.3 Response times for the ET 200S
D-3