Siemens NCU 7x0.3 PN Series - Diagnostics Via Input Image

Connectable components
9.3 PP 72/48D 2/2A PN
NCU 7x0.3 PN
Manual, 09/2011, 6FC5397-1EP40-0BA0
145
9.3.5.5 Diagnostics via input image
Table 9- 65 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 9- 66 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 defined 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 off the digital outputs, while the inputs remain at their last
set values.
Table 9- 67 Overview of the 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
0 No error
1 Impermissible input voltage in the temperature measurement mode
2 Reserved
3 Overload at the outputs
4 Incorrect operating mode selection
5 Internal error, system error
6 Range exceeded at the inputs
2
7 Range exceeded at the outputs
3 ... 7 0 Reserved