Siemens Sinumerik 828D Manual page 210

Anschließbare Komponenten
7.8 PP 72/48D PN
Note
The "alive and well" counter is a 3 bit modulo counter on a 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 7-83
"alive and
well" counter
0
1
2
3 ... 7
Table 7-84 Elimination of error at "alive and well" counter status "2"
Value Cause
byte 1
1 In the temperature measure‐
ment operating mode, an in‐
put voltage is too high. The
hardware may become dam‐
aged/destroyed as a result.
2 Reserved
3 Overload at the outputs
4 Incorrect operating mode se‐
lection, e.g. temperature
measurement at the analog
outputs.
210
Overview of messages as a function of the "alive and well" counter
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
Effect
The "PNFault" LED is activated.
The outputs are disabled.
The value 0x80 is stored in Status Byte
1.
-
The "PNFault" LED is activated.
The outputs are disabled.
The value 0x80 is stored in Status Byte
1.
Selection of operating mode is rejected,
Remedy
It is essential that a Pt100 element is
connected to terminals 3-4 or 7-8.
1)
The module must be restarted with Pow‐
er ON following elimination of the error.
-
Check the loads at the analog output.
The module must be restarted with Pow‐
1)
er ON following elimination of the error.
If selected correctly, the module switches
to cyclic operation.
Manual, 05/2015, 6FC5397-2DP40-3BA4
PPU and components