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Allocated CIO Area Words Bit 12 Name Mode command error Status ON Section 4-2 Controlled Unit operation by Unit This bit will be turned ON, if • more than one command mode switch has been set, i.e. Bit 00 to Bit 03 in Word n has been set, or • a mode command switch is set while the previous command is in progress, or • a mode transition command is given and the Unit has detected that it does not (yet) have a valid configuration or it detected an internal error, either of which prevented it from reaching that mode, e.g. Invalid Parameter set and transition to OPERATE mode. 13 Parameter error 14 to 15 Reserved by system 4-2-6 OFF ON Unit Unit OFF --- Unit --- If this bit is turned ON, it will remain so until a valid command is sent to the Unit. The invalid mode command will be ignored. If the bit flags have been cleared, the Unit will reset this bit to OFF. The Parameter set error will be turned to ON if an error has been detected in the contents of the Parameters set while configuring the PROFIBUS interface, using these parameters. If the bit flags have been cleared, the Unit will reset this bit to OFF. These bits will be set to OFF by the Unit. Slave Status (Word n+7) The Slave Status word collects all the information on the slave devices allocated to the Unit Master. It summarizes the slave information of the Slave Data_Exchange Active flags, see 4-2-8 Slave Data_Exchange Active Flags (Word n+9 to Word n+16)) and the Slave New-Diagnostics flags, see 4-2-9 Slave New Diagnostics Flags (Word n+17 to Word n+24). 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Word n+7 Slaves in data exchange Slave diagnostics received Word n+7 [n = CIO 1,500 + (25 x unit number)] Bit 00 Name All slaves in Data_Exchange mode Status ON OFF 01 to 03 Reserved by system --- Controlled Unit operation by Unit All slave devices, which are allocated to the PROFIBUS Master Unit are and enabled are in Data_Exchange with the PROFIBUS Master Unit. All slaves which are in Data exchange are indicated in CIO Word n+9 to n+16, see 4-2-8 Slave Data_Exchange Active Flags (Word n+9 to Word n+16). Unit When turned OFF, this bit indicates that at least one slave device is not in Data_Exchange with the PROFIBUS Master Unit. --These bits are reserved for future use and are always set to OFF by the Unit. 121