Bosch CL300 Manual page 70

System Modules
4−18
For fast fault isolation, status information is collected in an interrupt stack
to permit reconstruction of the program flow.
The following information can be requested using the PG4 Programming
Unit.
Absolute controller address
D
Register contents of A, B, and C
D
Status information
D
Data module base address
D
Module stack pointer
D
PLC command
D
I/O state counter
D
Number of interrupts per cycle
D
Cycle time counter
D
Program flow stack
D
In this stack, program flags are collected by means of the PLC command
* n" (n = 0−31), which reflect the program flow prior to the abortion. The
flags are set by the user at arbitrary points of the program and are stored
in the flow stack.
The ZE provides the controller program with special markers for various
status messages which can be evaluated according to the user's re
quirements.
Marker Event
SM28.0−28.7 Error Byte
SM28.0 Module Stack Error
SM28.1 Opcode Error
SM28.2 Addressing Error
SM28.3 Module Management Error
SM28.4 Controller Addressing Error
SM28.5 Parameter Error
SM28.6 C/T Set−point Error
SM28.7 Cycle Time Error
SM29.0−29.7 Cycle Time Counter (x 10 ms)
SM30.0−30.7 Max. Cycle Time
SM31.0 Initializing Pulse
SM31.1 Preventive Battery Fault Indication
Flexible Automation