求助：OB功能块的用途 点击：1241 | 回复：6
发表于：2007-01-16 20:51:00
1楼
0B80是：
Time Error (OB80)
Description
The operating system of the CPU calls OB80 when a time error occurs. Time errors include the following, for example:
Maximum cycle time exceeded
Time­of­day interrupts skipped by moving the time forward
Delay too great when processing a priority class
Programming OB80
You must create OB80 as an object in your S7 program using STEP 7. Write the program to be executed in OB80 in the generated block and download it to the CPU as part of your user program.
You can use OB80, for example, for the following purposes:
To evaluate the start information of OB80 and to determine which time­of­day interrupts were skipped.
By including SFC29 CANTINT, you can deactivate the skipped time­of­day interrupt so that it is not executed and only time­of­day interrupts relative to the new time will be executed.
If you do not deactivate skipped time­of­day interrupts in OB80, the first skipped time­of­day interrupt is executed, all others are ignored.
If you do not program OB80, the CPU changes to STOP mode when a time error is detected.
You can find detailed information on OBs, SFBs, and SFCs in the
Time Error (OB80)
Description
The operating system of the CPU calls OB80 when a time error occurs. Time errors include the following, for example:
Maximum cycle time exceeded
Time­of­day interrupts skipped by moving the time forward
Delay too great when processing a priority class
Programming OB80
You must create OB80 as an object in your S7 program using STEP 7. Write the program to be executed in OB80 in the generated block and download it to the CPU as part of your user program.
You can use OB80, for example, for the following purposes:
To evaluate the start information of OB80 and to determine which time­of­day interrupts were skipped.
By including SFC29 CANTINT, you can deactivate the skipped time­of­day interrupt so that it is not executed and only time­of­day interrupts relative to the new time will be executed.
If you do not deactivate skipped time­of­day interrupts in OB80, the first skipped time­of­day interrupt is executed, all others are ignored.
If you do not program OB80, the CPU changes to STOP mode when a time error is detected.
You can find detailed information on OBs, SFBs, and SFCs in the
发表于：2007-01-16 20:52:00
2楼
OB81是：
Power Supply Error (OB81)
Description
The operating system of the CPU calls OB81 if one of the following fails in a CPU or an expansion unit
The 24-V voltage supply
A battery
The complete backup
This OB is also called when the problem has been eliminated (the OB is called when an event comes and goes).
Programming OB81
You must create OB81 as an object in your S7 program using STEP 7. Write the program to be executed in OB81 in the generated block and download it to the CPU as part of your user program.
You can, for example, use OB81 for the following purposes:
To evaluate the start information of OB81 and determine which power supply error has occurred.
To find out the number of the rack with the defective power supply.
To activate a lamp on an operator station to indicate that maintenance personnel should replace a battery.
If you do not program OB81, the CPU does not change to STOP mode if a power supply error is detected, in contrast to all other asynchronous error OBs. The error is, however, entered in the diagnostic buffer and the corresponding LED on the front panel indicates the error.
You can find detailed information on OBs, SFBs, and SFCs in the
Power Supply Error (OB81)
Description
The operating system of the CPU calls OB81 if one of the following fails in a CPU or an expansion unit
The 24-V voltage supply
A battery
The complete backup
This OB is also called when the problem has been eliminated (the OB is called when an event comes and goes).
Programming OB81
You must create OB81 as an object in your S7 program using STEP 7. Write the program to be executed in OB81 in the generated block and download it to the CPU as part of your user program.
You can, for example, use OB81 for the following purposes:
To evaluate the start information of OB81 and determine which power supply error has occurred.
To find out the number of the rack with the defective power supply.
To activate a lamp on an operator station to indicate that maintenance personnel should replace a battery.
If you do not program OB81, the CPU does not change to STOP mode if a power supply error is detected, in contrast to all other asynchronous error OBs. The error is, however, entered in the diagnostic buffer and the corresponding LED on the front panel indicates the error.
You can find detailed information on OBs, SFBs, and SFCs in the
发表于：2007-01-16 20:54:00
3楼
STARTUP Mode
Before the CPU can start processing the user program, a startup program must first be executed. By programming startup OBs in your startup program, you can specify certain settings for your cyclic program.
There are three types of startup: warm restart, cold restart, and hot restart. A hot restart is only possible on S7-400 CPUs. This must be set explicitly in the parameter set for the CPU using STEP 7.
The features of the STARTUP mode are as follows:
The program in the startup OB is processed (OB100 for warm restart, OB101 for hot restart, OB102 for cold restart).
No time-driven or interrupt driven program execution is possible.
Timers are updated.
Runtime meters start running.
Disabled digital outputs on signal modules (can be set by direct access).
我的网站：plc.123ye.com。
Before the CPU can start processing the user program, a startup program must first be executed. By programming startup OBs in your startup program, you can specify certain settings for your cyclic program.
There are three types of startup: warm restart, cold restart, and hot restart. A hot restart is only possible on S7-400 CPUs. This must be set explicitly in the parameter set for the CPU using STEP 7.
The features of the STARTUP mode are as follows:
The program in the startup OB is processed (OB100 for warm restart, OB101 for hot restart, OB102 for cold restart).
No time-driven or interrupt driven program execution is possible.
Timers are updated.
Runtime meters start running.
Disabled digital outputs on signal modules (can be set by direct access).
我的网站：plc.123ye.com。
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