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● Capacities The central units 07 KR 91, 07 KT 92, 07 KT 93 have a very high powerfull treatment. A large number of software functions and a high velocity allows complexe applications. The central units 07 KR 31 and 07 KT 31 are used for smaller applications or as slave in a complexe application.The user program has to be stored in EEPROM in the 07 KR 31 and 07 KT 31. The user program can be stored in RAM in the 07 KR 91/ 07 KT 92 (only if the flash EPROM is erased and the battery is mounted). ● Range of variables The range of different variables in the 07 KR 31 / 07 KT 31 is smaller than the range in the 07 KR 91 / 07 KT 92 / 07 KT 93 (see chapter 1.4 "Operands"). ● Refresh variables All variables (inputs and outputs) are refreshed in the 07 KR 31 / 07 KT 31 even if these variables are not written in the user program. In case of a data acquisition application where the 07 KR 31/ 07 KT 31 is connected to a supervisor, it is not necessary to write in the user program the inputs or outputs (binary or analog).
07 KR 31, 07 KT 31 : The CS 31 bus cycle time is included in the cycle time KD00,00. The maximum cycle time (KD00,00) is 100ms for a master configuration and 250ms for a slave configuration. An error FK3 (code 200) is generated if the cycle time is greater than the time in KD00,00 : - the central unit aborts or continues the execution of the program according to the value of the system constant KW00,07. 07 KR 91, 07 KT 92, 07 KT 93 : The CS 31 bus cycle time is not included in the cycle time KD00,00.The value of the cycle time is not limited. An error FK2 (code 131) is generated if the cycle time is greater than the time in KD00,00 : - the central unit aborts the execution of the program.● Modification of a timer value online The new value of KD or MD is taken into account : - immediately in a central unit serie 30; - at the next timer in a central unit serie 90.● Diagnosis A user program too large (memory size too small) is detected in the 07 KR 31/07 KT 31. An error FK4(140) is generated. The overlapping ranges are not detected by the 07 KR 31 or the 07 KT 31. ● Forced variables Maximum number of I/O signals to be forced
With the 07 KR 91, 07 KT 92 or 07 KT 93, a maximum of 12 analog input units can be connected on the CS31 bus. With the 07 KR 31 or 07 KT 31, a maximum of 28 analog input units can be connected on the CS31 bus. ● Modbus The central units 07 KR 31 and 07 KT 31 have a built-in MODBUS interface used as a master or a slave on a MODBUS network. The central units 07 KR 91, 07 KT 92 or 07 KT 93 can be coupled to the 07 MK 92 coupler to be used as a MODBUS master or slave on a MODBUS network. ● Password A password can be used in the 07 KR 31 or 07 KT 31 to lock the program access in reading or writing. ● KW 00,08 The KW 00,08 constant is used in the 07 KT 92 / 07 KT 93 central units to detect an output short circuit. The KW 00,08 constant is not used in the 07 KT 31. ● Battery A battery failure is detected with the bit 3 of the status word EW 07,15. The battery can not be changed in the 07 KR 31 or 07 KT 31. In the 07 KR 91, 07 KT 92 or 07 KT 93, a led is lighted in case of battery failure and the battery can be changed.