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Messages in byte 0
Bit
7
6
5
4
3
2
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 off the digital outputs, while the inputs remain at their last set
values.
"alive and
well" counter
0
1
2
3 ... 7
NCU 1750
Equipment Manual, 10/2023, A5E45627807B AH
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
Value
Message
byte 1
0
Reserved
Temperature value
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
0
Reserved
Connectable components
12.2 PP 72/48D PN and PP 72/48D 2/2A PN
141
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