Siemens SIMATIC ET 200S - Calculation of response time with the IM151-1 STANDARD and IM151-1 FO STANDARD

Response Times
D-3
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Calculation of the response time with the IM151-1 STANDARD and IM151-1 FO
STANDARD
The following formula enables you to make an approximate calculation of the ET
200S response time:
Response time [ms]* = 55 · m +110 · a + 400 · t + 190
* Parameter bus length > 1m: The response also increases by 40%.
Explanation of the parameters:
• m: Total number of all modules (power modules, digital electronic modules,
analog electronic modules, IQ-SENSE electronic modules, process-related
modules, and motor starters)
• a: Sum of all analog electronic modules, 4 IQ-SENSE electronic modules, and
1SSI fast electronic modules
• t: Number of all process-related modules (except 1SSI fast)
Note
The formula specified applies to cyclic data transfer. The following prerequisites
must be fulfilled:
• No diagnoses are reported.
• No modules are removed and inserted.
Example for calculation of the ET 200S response with the IM151-1 STANDARD
and IM151-1 FO STANDARD
IM151-1 STANDARD
PM-E 24 VDC
2DI 24 VDC
4DO 24 VDC
2DI 24 VDC 4DI 24 VDC
2DO 24 VDC
2RO
1SSI
1SSI fast
2DO 24 VDC
PM-D
DS
DS DS
Bus terminator
PM-E 24 VDC
2DO 24 VDC 2DO 230 V
PM-E 230 AC
2DO 230 V
2AI U
2AO I
Slot
1 2 3 4 5 6 7 8 91011 1314151617181912 20 21
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 ms
Figure D-3 Example of the calculation of the response time in the case of the IM151-1
STANDARD, IM 151-1 FO STANDARD