PROFIBUS Manual

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Navigation: MS0: cyclic data > Configuration > Telegrams on the bus

Check configuration

The DP master sends a Check-Configuration telegram to the DP slave to confirm its configuration. For this purpose it transmits an SRD service to SAP 62. The slave responds with a short confirmation (one character).

Addr	Msg type	Req Res	SAPS	Len	Data
1->22	Chk Configuration	Req	62-> 62	2	11 21
1<-22	Ack	Res

After the configuration check, the DP slave switches state from "Wait Configuration" (WCFG) to the "Data Exchange" state (DXCHG).

The slave accepts this telegram with a short confirmation. If the configuration in this telegram does not match the configuration in the DP slave, i.e. is not compatible, a positive short confirmation is still sent. However, in the next diagnostic telegram a configuration fault Cfg_Fault will be signalled. An exception is possible if the Check_Cfg_Mode bit in the Set_Parameter telegram has been set.