CPU modules
4.1 CPU module CPU555
SIMATIC TDC hardware
78
System Manual, 08/2017, A5E01114865-AL
4.1.3
Status and fault displays
The dot matrix shows the configured number of the CPU module (1 to 20) in normal
operation. Faults are indicated by a letter that informs you of the type of fault.
Slow alternation between the light and dark state of the dot matrix is referred to as flashing in
the following table.
Note
Maximum assembly
The CPU module CPU555 can only be operated in the rack UR6021.
A maximum of eight CPU555 can be inserted in one UR6021.
Table 4- 1
Operating and fault states of CPU555
Display
Operating and fault states
Can be
cleared with
S1
1...20
Configured number of the CPU module in normal operation.
User program is running
No
A
User error
User program is running
Diagnostics event, user-defined by means of USF function block
Yes
All 35 dots off Initialization phase:
User program is not running
Individual initialization phases during startup are indicated by means
of a colored circle and consecutive numbers.
No
All 35 dots
flashing
Module failure:
User program is not running
•
Hardware failure => replace CPU555
•
Fatal software error => contact the Hotline
No
All 35 dots on Partial power failure, FPGA1 failure or errors on the module:
User program is not running
•
Hardware failure => replace CPU555
•
Fatal hardware fault => contact the Hotline
No
Colored circle
flashing
Initialization phase:
User program is not running
No
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