Siemens ET 200S - Page 542

Response Times
D-4
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
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 there are only power modules, digital electronic modules, and motor starters
in your ET 200S setup (exception: no motor starters; High Feature), the
following formula applies:
Response time [s] = response time
PII
+ response time
PIQ
+ 1000*
Response time
PII
[s] = 55 · m +130
Response time
PIQ
[s] = 10 · m
do
+90
2. If your ET 200S setup differs from no.1, the following formula applies:
Response time [s] = response time
PII
+ response time
PIQ
+ 1000*
Response time
PII
[s] = 55 · m +125 · ai + 175 · t +250
Response time
PIQ
[s] = 10 · m
do
+125 · ao + 175 · t +130
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
do
: Slot number of the last digital output module, 4 IQ-SENSE electronic
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 the analog input modules
 ao: Sum of all the analog output modules
 t: Number of all process-related modules
 *: In the case of clocking, this value can be increased at 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.