CM572-DP PROFIBUS DP Communication Module FDL DDLM Requests Class 1¶
Services, which were send continuously according to the PROFIBUS® DP standard, are counted in this table. Fundamentally, only the data-exchange-all should be count in a faultless network.
The services:
- set-slave-list,
- set-prm,
- chk-cfg,
- data-exchange,
permit in case of faultless course for each configured Slave module to be activated only 1 time. If the count changes continuously in case of these services, a bus error has occurred. If, for example the service slave-diag changes sporadically, the bus cable can have a defect, or the terminating resistor is missing in the cable. It is also possible, that a conscious error report of a Slave module activates the service in the Master.
| Parameter | Description |
|---|---|
| Set bus parameter | Counter for Set-Bus-Par request |
| Set slave address list | Counter for Set-Slave-List request |
| Slave diagnostic request | Counter for Slave-Diag request |
| Check configuration request | Counter for Check-Cfg request |
| Data exchange request | Counter for Data-Exchange request |
| Data exchange conf. pos. | Counter for Data-Exchange confirmation positive |
| Data exchange conf. neg. | Counter for Data-Exchange confirmation negative |
| Data exchange all request | Counter for Data-Exchange-All request |
| Data exchange all conf. pos. | Counter for positive confirmation of Data-Exchange-All |
| Data exchange all conf. neg. | Counter for negative confirmation of Data-Exchange-All |