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FX2N-32DP-IF Profibus-DP Interface Unit Advanced Devices 4
4-3
4.2 Diagnostic Devices (Special Devices)
Unsettable Devices:
Any device of type M or D that is marked with a “(
)” or “(
)” cannot be set by the program-
ming tool. In the case of M devices this means the associated coil cannot be driven but all
device can be monitored. For data devices D, new values cannot be written to the register
by a user but the register contents can be monitored.
Symbol Summary:
•
automatically written to by the 32DP-IF
•
automatically written to by the DP-master
• 32DP-IF send an extended diagnosis message to DP-master if marking device is ON.
For diagnostic massage, refer to chapter 7.