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 7-77 Overview of messages as a function of the "alive and well" counter
"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
Table 7-78 Elimination of error at "alive and well" counter status "2"
Value
byte 1
Cause Effect Remedy
1 In the temperature
measurement operating
mode, an input voltage is too
high. The hardware may
become damaged/
destroyed as a result.
The "PNFault" LED is activated.
The outputs are disabled.
1)
The value 0x80 is stored in Status Byte
1.
It is essential that a Pt100 element is
connected to terminals 3-4 or 7-8.
The module must be restarted with
Power ON following elimination of the
error.
2 Reserved - -
3 Overload at the outputs The "PNFault" LED is activated.
The outputs are disabled.
1)
The value 0x80 is stored in Status Byte
1.
Check the loads at the analog output.
The module must be restarted with
Power ON following elimination of the
error.
4 Incorrect operating mode
selection, e.g. temperature
measurement at the analog
outputs.
Selection of operating mode is rejected, If selected correctly, the module switches
to cyclic operation.
5 Internal error, system error The "PNFault" LED is activated.
The outputs are disabled.
1)
The value 0x80 is stored in Status Byte
1.
The firmware has detected a system
error, this status can only be exited by
means of a switch-on / switch-off.
Connectable components
7.6 PP 72/48D PN
PPU
182 Manual, 01/2014, 6FC5397-2DP40-3BA3
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