Siemens SIMATIC ET 200S Manual page 568

Response Times
Calculation of the response time in the case of the IM151-1 HIGH FEATURE
When you calculate the ET 200S response time, you have to choose between 2
setup variants:
1. If you only have power modules, digital electronic modules and motor starters in
your ET 200S system (exception: no motor starters; High Feature), use the
following formula:
Response time [ms] = response time
Response time
Response time
2. If your ET 200S setup differs from no.1, the following formula applies:
Response time [ms] = response time
Response time
Response time
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)
• m : Slot number of the last digital output module, 4 IQ-SENSE electronic
do
module, or motor starter in the ET 200S setup. You should place these modules
or motor starters on the front slots to improve the response time.
• ai: Sum of all analog output modules
• ao: Sum of all analog output modules
• t: Number of all process-related modules
• *: In the case of clocking, this value can be increased by configuration (settings
on the DP master system in HWCONFIG equidistant DP cycle). Note: This
value (1000 µs) must be included in the calculation even if you have not set
clocking.
D-4
PII
[ms] = 55 · m +130
PII
[ms] = 10 · m +90
PIQ do
PII
[ms] = 55 · m +125 · ai + 175 · t +250
PII
[ms] = 10 · m +125 · ao + 175 · t +130
PIQ do
+ response time + 1000*
PIQ
+ response time + 1000*
PIQ
ET 200S Distributed I/O System
EWA-4NEB 780602402-12