Diagnostics Via Input Image - Siemens SINUMERIK ONE NCU 1740 Equipment Manual

Connectable components
12.2 PP 72/48D PN
12.2.4.2

Diagnostics via input image

Table 12-28 Diagnostics input image
Byte Bit7
d+0 count_2
d+1
Table 12-29
Bit
7
6
5
4
3
2
1
0
Note
The "alive and well" counter is a 3 bit modulo counter at the PP application level. The PP
application can be monitored using this counter. Failure of the application software does not
generally result in a communication failure, as this is developed in a hardware-supported
manner. The watch dog switches off the digital outputs, while the inputs remain at their last set
values.
Table 12-30
"alive and
well" counter
0
1
2
3 ... 7
126
Bit6 Bit5
count_1 count_0
Messages in byte 0
Signal name Message
count_2 alive and well 2
count_1 alive and well 1
count_0 alive and well 0
T_Alarm_2 Temperature not within the operating temperature range defined for the
module
T_Alarm_1 Critical temperature exceeded
Diag_2 Overload DO byte 5/4
Diag_1 Overload DO byte 3/2
Diag_0 Overload DO byte 1/0
Messages in byte 1, depending on the "alive and well" counter
Value Message
byte 1
0 Reserved
Temperature value
5 Internal error, system error
Effect: The "PNFault" LED is activated. The outputs are disabled. The value
0x80 is stored in status byte 1.
Remedy: Switch the module off and on again.
0 Reserved
Bit4 Bit3
T_Alarm_2 T_Alarm_1
Status_1
Equipment Manual, 10/2021, A5E51087503B AA
Bit3 Bit1
Diag_2 Diag_1
Bit0
Diag_0
NCU 1740