Siemens SIMATIC ET 200iSP

Calculating the reaction time of the ET 200iSP
The following formula allows an approximate calculation of the ET 200iSP response time with
the IM 152-1DP:
Response time [ms] = g + b × 0.065 ms
Explanation of the parameters:
• g: Basic value of the IM 152-1DP according to operating mode
• b: Sum of all input and output bytes of the electronic modules
Table A-11 The following assignment applies to the basic value of IM 152-1DP:
Operating mode Basic value (g)
*)
IM 152-1DP (no redundancy mode) 1.5 ms
Redundancy mode IM 152-1DP 2 ms
*)
The speci󹪝ed basic values only apply to cyclic data exchange. Acyclic activities (e.g. diagnostic
interrupts) are ignored.
Table A-12 The following table applies for determining all input and output bytes (I/O bytes) and as a
template for calculation:
Electronic modules Number of I/O bytes
*)
x number of
modules
Total I/O bytes
8 DI NAMUR with digital inputs 3 X =
8 DI NAMUR with counting Inputs 7 X =
4 DO / 2 DO Relay 2 X =
4 AI / 4 AO without HART 8 X =
8 x = 4 AI / 4 AO with HART 28 (max.) X =
WATCHDOG 2 X =
Total of all I/O bytes (b) =
*)
Only a partial spectrum, the input and output bytes of each electronic module must be added together.
Example for the calculation of the response time
ET 200iSP with the following con󹪝guration:
• IM 152-1DP (no redundancy mode)
• 3 modules 8 DI NAMUR with digital inputs
• 3 modules 4 DO
• 1 WATCHDOG module
Basic value = 1.5 ms
Sum of all I/O bytes = 3 × 3 + 2 × 3 + 2 × 1 = 9 + 6 + 2 = 17
Response time [ms] = 1.5 ms + 17 × 0.065 ms = 2.605 ms
Appendix
A.3 Reaction times
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK 431