Siemens SINUMERIK ONE NCU 1740 - Diagnostics Via Input Image

12.2.4.2 Diagnostics via input image
Table 12-28 Diagnostics input image
Byte Bit7 Bit6 Bit5 Bit4 Bit3 Bit3 Bit1 Bit0
d+0 count_2 count_1 count_0 T_Alarm_2 T_Alarm_1 Diag_2 Diag_1 Diag_0
d+1 Status_1
Table 12-29 Messages in byte 0
Bit Signal name Message
7 count_2 alive and well 2
6 count_1 alive and well 1
5 count_0 alive and well 0
4 T_Alarm_2 Temperature not within the operating temperature range de󹪝ned for the
module
3 T_Alarm_1 Critical temperature exceeded
2 Diag_2 Overload DO byte 5/4
1 Diag_1 Overload DO byte 3/2
0 Diag_0 Overload DO byte 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 o󹪜 the digital outputs, while the inputs remain at their last set
values.
Table 12-30 Messages in byte 1, depending on the "alive and well" counter
"alive and
well" counter
Value
byte 1
Message
0 0 Reserved
1 Temperature value
2 5 Internal error, system error
E󹪜ect: The "PNFault" LED is activated. The outputs are disabled. The value
0x80 is stored in status byte 1.
Remedy: Switch the module o󹪜 and on again.
3 ... 7 0 Reserved
Connectable components
12.2 PP 72/48D PN
NCU 1740
126 Equipment Manual, 10/2021, A5E51087503B AA