Process data utilization: Calculation examples
You can calculate the process data utilization of a network using the information provided in chapters Maximum number of stations and Calculation of available useful data length. The network utilization must not exceed 100%.
The following two tables show a calculation example each for two different networks:
Example (LRW command) | Quantity | Bytes in | Bytes out | |
|---|---|---|---|---|
MOVIDRIVE® modular MDA90A single-axis module | 10 | 16 PD | 320 | 320 |
2 × PROFsafe 4/3 bytes | 28 | 28 | ||
MOVIDRIVE® modular MDD90A double-axis module | 10 | 12 PD each | 480 | 480 |
1 x PROFIsafe 6/5 bytes | 14 | 14 | ||
MOVI-PLC® I/O system C: 3 × ODI81C 2 × ODO81C | 1 | 8 bytes in for diagnostics 3 bytes in 2 bytes out | 11 | 2 |
Number of slaves | 21 |
| ||
Utilized useful data (sum) | Comment: With LRW, use the greater value of bytes in und bytes out as the sum. | 853 | 844 | |
853 bytes | ||||
Available useful data | 1424 bytes - [≈(21/8)] bytes = 1421 bytes | |||
Process data utilization | 60% | |||
Example (LWR/LDR command) | Quantity | Bytes in | Bytes out | |
|---|---|---|---|---|
MOVIDRIVE® modular MDA90A single-axis module | 15 | 16 PD | 480 | 480 |
1 x PROFIsafe 6/5 bytes | 14 | 14 | ||
MOVIDRIVE® modular MDD90A double-axis module | 2 | 8 PD each | 64 | 64 |
1 × PROFIsafe 4/3 bytes | 14 | 14 | ||
Hilscher NT-100-RE-DP | 1 | 10 PD | 20 | 20 |
Number of slaves | 18 |
| ||
Utilized useful data (sum) | Comment: With LWR/LDR, use the sum of bytes in and bytes out. | 592 | 592 | |
1184 bytes* | ||||
Available useful data | 1412 bytes - [≈(18/8)] bytes = 1409 bytes | |||
Process data utilization | 84% | |||
