Profibus Communication Errors - Watson-Marlow qdos20 User Manual

17.2

PROFIBUS communication errors

In PROFIBUS mode, the screen below is displayed, the P indicates data exchange is
happening.
This screen will only be displayed after successful implementation of Master Slave
communications, which always follow the sequence described below.
Power ON Reset
Parameterisation
I/O configuration
Data exchange
If data exchange is lost at any time, the following screen will be displayed. The first red dot
corresponds to the stage at which the error occurred and subsequent stages will indicate a
red dot because the communication sequence halted before this point.
m-qdos-en-02
Power ON / reset of Master or Slave
Download of parameters into the field device (selected
during configuration by the user)
Download of I/O configuration into the field device
(selected during configuration by the user)
Cyclic data exchange (I/O data) and field device reports
diagnostic
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