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9.3 Return of Submodul Alarm
A so-called “Return-of-Submodule-Alarm” is indicated by the measuring system, if
that measuring system can deliver valid data again for a defined input element, without having
to perform a re-parameterization, or
an output element can process the received data again.
The status for the measuring system (submodule) IOPS/IOCS changes from BAD to GOOD in this case.
9.4 Integration of organization blocks (OBs)
The user has access to a number of so-called “organization blocks” if the SIEMENS automation
system SIMATIC S7 is used.
Organization blocks form the interface between the operating system of the CPU and the user
program. OBs allow for the selective execution of program parts, e.g. when errors occur or when
process alarms occur.
Organization blocks are processed according to the priority assigned to them.
In the event of an error, the controller CPU generally goes into STOP mode if the corresponding OB
has not been included. This is not always desirable and can be prevented by including the
corresponding OB. The OB does not have to be programmed explicitly for this purpose. The OB must
be programmed accordingly only if a special error response is required.
OBs are called if the position of the measuring system is accessed during a failure.
For more information on organization blocks, see the SIEMENS documentation
6ES7810-4CA08-8AW1, “System Software for S7-300/400 System and Standard Functions Volume 1/2”.
9.4.1 Diagnostic alarm OB (OB 82)
This OB is generally triggered when the measuring system transmits a diagnostic alarm to the
controller, see Chapter “PROFINET Diagnostic alarm” on Pages 71 and 143.
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