44 5756B
Description of the Diagnostic Registers
The diagnostic display is mapped to the PLC by the
diagnostic status register and diagnostic parameter register.
These registers inform the PLC about the current state of the
INTERBUS system. In the application program, operating
states, errors, and other information are represented as
inputs.
The extended diagnostic parameter register contains
additional diagnostic information about the INTERBUS
system (e.g., Inline devices). In case of error this register is
mapped using the diagnostic function FC 24 in DBW 168 of
the IBDB.
Diagnostic Status Register
In the diagnostic status register, information is available as
input bits. A state is assigned to each bit, which is further
defined by the diagnostic parameter register.
Figure 30 Diagnostic status register
n+1
WARNING
SDSI
SY-RESULT
CPU in STOP
Synchronization error occurred
Specified w ait tim e exceeded
M essage for P LC
BS A Bus segm ent sw itched off
RESULT
Standard function negatively processed
DC-RESULT
Faulty data cycles
QUALITY
Specified error density exceeded
STO P
76
5
43210
70
n
n+1
RUN
READY
CTRL
Peripheral fault
Error on controller board/hardw are
D a ta tra n s m is s io n is a c tiv e
C ontroller board is ready for operation
USER User error
BUS
Bus error
DETECT
D iagnostic routine is active
ACTIVE
Selected configuration is ready for operation
PF
76
5
43210
70
n
5756B045
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