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Creation of the user program
using the programming languages
– Extended instruction list (ext. IL)
– Function block diagram (FBD) and
– Ladder diagram (LD)
Test in ext. IL, FBD and LD (see 907 PC 331)
Test in terminal mode,
e.g. in the programming software 907 PC 331
(main menu ”PLC commun. 2”,
submenu ”Terminal emulation”) Test
Press the following
Setting the operating modes The constants KW 00,00...KW 00,15 are reserved as system constants. Even the constants KW 00,13...KW 00,15 which are not used yet may under no circumstances be used for other purposes.
M 255,15 This binary flag can be used for detection of the first program cycle after a program start. It is always set to ”zero” after each program start, independent of the initialization instructions given by the system constants. If this flag is read by the user program and then set to ”1”, it can be found out whether or not the user program was started once more.
CS31 status word EW 07,15 Bit 0 = 1 : No class 2 error present. Bit 1 = 1 : PLC has been adopted into the CS31 bus cycle (only relevant if used as a slave). Bit 2 = 1 : Time and date are valid. Bit 3 = 1 : Battery is effective. Bit 4...7 : Not used. Bit 8..15 : Maximum number of modules on the CS31 system bus, found out until now (only relevant if used as a master).
Definitions
Cold start
– All of the RAM memories are tested and
deleted.
– If there is no user program in the Flash–EPROM,
the default values are set to all of the system
constants (identical to the factory settings).
– If there is a user program in the Flash–EPROM,
this program is loaded into the RAM including the
system constants.
– The operating modes given by the system constants are set.
– The CS31 system bus is initialized again(only
when used as a master on the CS31 system
bus).
Performing a cold start
– Power OFF/ON, if there is no backup battery or
– Command KALT