Manual
Double Sheet Control System R1000 series L20
with integrated fieldbus interface
B0063191 / 1.3
Communication with the PLC
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6.4.8 Reset faulty access
For the following reasons a service cannot be executed:
•
The current operating conditions do not allow the execution of the selected service.
•
The collision bit in the management byte has not been reset.
•
The index register address invalid parameters.
•
The service cannot be applied to this parameter.
•
The application data contains inadmissible values.
•
The service is unknown.
The reasons above can prevent the service execution during reading or writing. The R1000
indicates this problem by the collision bit. In order to prevent an additional uncontrolled access
procedure, the R1000 expects the reset of the called service by the master. In addition the master
executes an “Empty service“ with the confirmation of a handshake. After receipt of this empty
order, the R1000 puts the collision bit back and confirms the service with a handshake. Thus the
fault condition can be reset and the R1000 is available for further orders.
Note
If necessary the collision bit can be reset by the service “Close
parameter channel“ and by the service “Reset parameter channel“.
However the parameter channel is thereby closed.
6.4.9 Listing of parameter channel commands
A list with all parameter channel commands is specified in chapter 11 “Technical records".
