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Description
You can use the Excel table "S7fcotia.xls" for calculating monitoring and response times in a safety-related application with S7 Distributed Safety. The table is available for free downloading in Entry ID: 25412441.
The "S7fcotia.xls" table has three tabs. The first tab contains the calculation of the maximum runtime of the F runtime group depending on the F CPU used. Here, among other things, you enter the number of F function blocks used from the S7 Distributed Safety library.
The associated F function blocks are not provided in the "S7fcotia.xls" table for the Mobile Panel 277F IWLAN.
Max. response times of Mobile Panel 277F IWLAN
| |
Time in ms |
TRES_no_Fault
(max. response time without error) |
25 |
TRES_one_Fault
(max. response time with one error) |
25 |
Table 01
The following table shows how to incorporate the execution times of the F function blocks and incorporation of the maximum response time of the Mobile Panel 277F IWLAN in the "S7fcotia.xls" table.
| No. |
Procedure |
| 1 |
Determining the execution times of the F function blocks for Mobile Panel 277F IWLAN
- Insert the number of used F programm blocks in the table at the attachment 1.
- Note the automatically caluted values from your used F programm blocks.
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| 2 |
Incorporating execution times in the "S7fcotia.xls" table
- Open the "S7fcotia" table and select the tab
"Max. runtime of F runtime group".
- Manually enter the time value determined (from 1) in the "Sum of execution times" line (section "F-FBs/F-FCs from other F library") under the corresponding CPU in the "S7fcotia.xls" table.
- The "Max. runtime of F runtime group" section of the "S7fcotia.xls" table displays the sum of the execution times of the F runtime group.
Then continue with "Estimation of the automation system's response time". |
| 3 |
Incorporating maximum response times in the "S7fcotia.xls" table
- Open the "S7fcotia" table and select the tab
"Max. response times".
- The "Observed signal flow of the safety function" section lists four different F I/O versions.
Select the version corresponding to your system configuration and enter the maximum response time (see Table 01) in the cells provided (TWCDT and TOFDT).
Then continue with "Estimation of the automation system's response time".
Instructions for this are available in Entry ID: 23926783. |
Table 02
Excel table "27097159_Runtime_F_FB_V1_1_en.xls"
The attached Excel table "27097159_Runtime_F_FB_V1_1_en.xls" is for easy addition of the execution times of the F program blocks for the Mobile Panel 277F IWLAN.
Enter the time value determined in the "Sum of execution times" line (section "F-FBs/F-FCs from other F library") in the "S7fcotia.xls" table.
 Attachment 1: Runtime_F_FB_V1_1_en.xls ( 28 KB )
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german
