Siemens SIMATIC FM 452, Manual

Page: 144 / 210

Diagnostics
11-4
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
11.3 Diagnostic Interrupts
Interrupt Servicing
The FM 452 can trigger hardware interrupts and diagnostic interrupts. You service
these interrupts in an interrupt OB. If an interrupt is triggered and the
corresponding OB is not loaded, the CPU changes to STOP (refer to the manual
Programming with STEP 7).
You enable the servicing of diagnostic interrupts as follows:
1. Select the module in HW Config
2. Using the menu command Edit > Object Properties > Basic Parameters,
enable diagnostic interrupts.
3. Save and compile the hardware configuration.
4. Download the hardware configuration to the CPU.
Overview of the Diagnostic Interrupts
The following events and errors trigger a diagnostic interrupt:
•
Operating errors
•
Incorrect machine data (when parameters assigned with SDB)
•
Incorrect cam data (when parameters assigned with SDB)
•
Diagnostic errors
These errors are explained in detail in Appendix C.4, page C-15 onwards.
Reaction of the FM 452 to an Error with a Diagnostic Interrupt
•
Cam processing is stopped
•
The synchronization is deleted with the following diagnostic interrupts:
– Front connector missing, external power supply missing
– A zero marker error was detected, cable fault (5 V encoder signals)
– The travel range was exceeded (indicated by an operating error)
– Set actual value cannot be executed (indicated by an operating error).
•
With one exception, control signals are no longer processed
Exception:
If the software limit switch is passed, a change in direction is still possible in the
simulation mode.
•
Function switches and jobs continue to be processed.