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 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 7-84 Elimination of error at "alive and well" counter status "2"
Value
byte 1
Cause Effect Remedy
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.
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 Pow‐
er 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 Pow‐
er ON following elimination of the error.
4 Incorrect operating mode se‐
lection, e.g. temperature
measurement at the analog
outputs.
Selection of operating mode is rejected, If selected correctly, the module switches
to cyclic operation.
Anschließbare Komponenten
7.8 PP 72/48D PN
PPU and components
210 Manual, 05/2015, 6FC5397-2DP40-3BA4
To Next Page
Loading...
Need help?
General
