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 dened 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
Messages in byte 1, depending on the "alive and well" counter
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.
"alive and
well" counter
Value
byte 1
Message
0 0 Reserved
1 Temperature value
2 0 No error
1 Impermissible input voltage in temperature measurement mode
2 Reserved
3 Overload at the outputs
4 Incorrect operating mode selection
5 Internal error, system error
6 Overrange at the inputs
7 Overrange at the outputs
3 ... 7 0 Reserved
Connectable components
12.2PP 72/48D PN and PP 72/48D 2/2A PN
NCU 1750
Equipment Manual, 10/2023, A5E45627807B AH 141
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