Instruction manual

1070 072 163-101 (97.11) GB
Introduction2-2
Diagnosing Sequencing Faults
All processing sequences can be monitored and diagnosed in both time-
specific and peripheral-controlled fashion. In addition, the diagnostic func-
tion can be used to cause the current statuses of any cascade sequence,
in conjunction with its operating mode and the current cascade informati-
on, to be displayed.
When displaying the cascade information of the screen of the operating
panel, the step indication uses the instruction list (IL) format.
Displaying and Modifying Operand Statuses
The current status of any control operand can be displayed and modified
in different display formats.
Displaying Control Information
Internal controller information, such as CPU Halted, I/O Fixated, Battery
Warning, as well as the system time and the values affecting cycle time
and the selected watchdog function, are indicated.
2.3 Sequential Control and Diagnostics Concept
The concept is based upon the observation that — similar to the operation
of smaller controllers — smaller, more cost-effective operating devices
can be used for the visual presentation of diagnostic data, even for the
more powerful control units. For this reason, the task of a cascade se-
quence diagnostic function in the form of a software solution consists of
depositing the diagnostic data in a transfer memory buffer for access by
subsequent processing functions. The processing and display of the re-
ferred data is handled by the external BT5 and BT20 operating terminals
that are able to read this buffer without requiring assistance. The DM120
data module has been designated as the transfer memory module.
The two main processing tasks, such as:
• Controller procedures, and
• Diagnostic functions
are handled, in the case of the CL200, by the KETTE200 cascade mana-
gement module. With the CL400/CL500, the KETTE function module and
the DIAG500E module assume the control functions. Additional function
modules are required to establish the relevant connections with operating
and display devices. For the BT5 and BT20 operating terminals, the
BTSMADAP and BTS_ZV function modules are available.
In the case of the CL200, the two above mentioned main processing
tasks were implemented in the controller firmware, and therefore do not
burden the application PLC memory. The function is enabled by the KET-
TE200.PBL module.