The setting object is opened, and the display window is divided into "processing of enable and start of output when starting", "Startup after Power On" and "Monitoring Time for". Three areas (see Figure 14-2.3).
(1) Allowed start-up and start-up processing of the output setting The area has the following three options:
Startup when expected/actual configuration differ: You can choose whether the hardware configured in STEP7 does not match the actual installation, and whether it needs to be started. When this option is selected, the above situation can also be performed. start up.
Reset outputs hot restart: You can choose whether to clear the output status when plc is hot started. When this option is selected, the output status will be cleared during hot start.
Disable hot restart by operator or communication job: By selecting the option, you can disable the hot start of the PLC by means of programmer or MPI interface communication.
(2) Startup after Power On setting This area has the following three options:
The option "Hot restart": used to select the "hot start" mode;
The option "Warm restart": used to select the "warm start" mode;
The option "Clod restart": used to select the "cold start" mode.
Hot restart, Warm restart, and Cold start are defined by the S7 series PLC according to the EN61131 standard when the PLC-CPU is restarted (such as changing the operating mode switch of the CPU from STOP to RUN). Or power on)
The three new startup method names. In the S7 series PLC, the startup process of the three startup modes differs as follows:
Hot restart: When the PLC-CPU is restarted, the organization block OB101 is processed first before the main loop OB1 is executed. All CPU data is backed up at startup, and all data areas (including timers, counters, flag registers, etc., regardless of the holding area and non-holding area) are all retained.
Warm restart: When the PLC-CPU is restarted, the organization block OB100 is processed first before the main cycle OB1 is executed. The contents of all PLC data blocks (DB) are reserved at startup; the contents of the hold timer, counter, and flag registers remain unchanged; the contents of the timer, counter, and flag registers of the non-retentive area are cleared.
Cold start: When the PLC-CPU is restarted, the organization block 08102 is processed first before the main loop OB1 is executed. At the time of startup, the contents of all PLC data blocks (DB) are cleared, and the original set value is input again from the load memory; the contents of all the timers, counters, and flag registers of the CPU are cleared (regardless of the hold area and Non-holding area).
(3) Monitoring Time for setting There are three options in this area:
Module completed completion time ("Finished" message by modules): used to set the "module configuration detection complete" signal response time, when the completion signal is not received beyond this time, the actual hardware configuration is considered to be inconsistent with the STEP7 configuration. The time is set in units of lOOms and the default setting is 650.
Transfer of parameters to modules: Used to set the maximum allowable time for parameters in the CPU to be transmitted to each module. The time setting unit is lOOms and the default setting is 100. For CPUs with a PROFIBUS-DP master interface, this parameter can be used to detect the start of the slave. Similarly, when the parameter transfer has not been completed after the set time, it is considered that the actual hardware configuration does not match the STEP7 configuration.
Hot restart: Used to set the hot start time of the CPU. This parameter can only be set when the hot start mode is selected.
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