ð The server responds with 60 byte starting from MB220. DR is set for one CPUcycle and thus M101.2 is set to "1".8. The client sends a Modbus request with Function code 05h start address 5008 andthe value FF00h.ð The server acknowledges the request and writes "1" to the output Q1.0. NDR isset for one CPU cycle and thus M101.1 is set to "1".9. The client sends a Modbus request with Function code 03h start address 50 (doesnot exist) and quantity 1.ð The server responds with Exception code 02h an sets ERROR/STATUS for oneCPU cycle. MW108 returns 8383h.9.2 RTU9.2.1 FB 72 - RTU_MB_MASTER - Modbus RTU master9.2.1.1 DescriptionThis function block allows the operation of the internal serial RS485 interface of aSPEED7 CPU from VIPA or a System SLIO CP 040 as Modbus RTU master.Call parameterName Declaration Type DescriptionREQ IN BOOL Start job with edge 0-1.HARDWARE IN BYTE 1 = System SLIO CP 040 /2 = VIPA SPEED7 CPULADDR IN INT Logical address of the System SLIO CP 040 (parameter is ignoredwith the VIPA SPEED7 CPU).MB_UNIT_ID IN BYTE Modbus: Device identification = Address of the slave (0 ... 247).MB_FUNCTION IN BYTE Modbus: Function code.MB_DATA_ADDR IN WORD Modbus: Start address or Sub function code.MB_DATA_LEN IN INT Modbus: Number of register/bits.MB_DATA_PTR IN ANY Modbus: Data buffer (only flag area or data block of data type byteallowed) for access with function code 03h, 06h and 10h.DONE* OUT BOOL Job finished without error.BUSY OUT BOOL Job is running.ERROR* OUT BOOL Job is ready with error - parameter STATUS has error information.STATUS* OUT WORD Extended status and error information.*) Parameter is available until the next call of the FBParameter in instance DBName Declaration Type DescriptionINIT STAT BOOL With an edge 0-1 an synchronous reset is established at the SystemSLIO CP 040. After a successful reset the bit automatically reset.VIPA SPEED7Modbus CommunicationRTU > FB 72 - RTU_MB_MASTER - Modbus RTU masterHB00 | OPL_SP7 | Operation list | en | 18-30190
