Siemens Simatic ET 200S Operating Instructions Manual page 304

Response times
D.3 Response times for the ET 200S
Example for calculating the ET 200S response time for IM151-1 STANDARD and
IM151-1 FO STANDARD
Figure D-3
Calculation method:
m = 21; a = 3; t = 1
Response time = 55 · m +110 · a + 400 · t + 190
Response time = 55 · 21 +110 · 3 + 400 · 1 + 190
Response time = 2075 μs
Calculation of the response time for the IM151-1 HIGH FEATURE (6ES7151-1BA01-0AB0)
The following equation enables you to make an approximate calculation of the ET 200S
response time:
Response time [µs] = 22 · m + 14 · b + 213
Explanation of the parameters:
• m: Sum total of all configured modules
• b: Sum total of all input and output bytes (without bit granular modules)
D-4
Example set-up for calculating the reaction time for the IM151-1 STANDARD,
IM 151-1 FO STANDARD
Operating Instructions, 12/2005, A5E00515771-03
ET 200S