5. Diagnosis and error treatment
5-13
Festo P.BE-VIDN-03-8A-GB 0003NH
5.1.7 Diagnosis on the Allen-Bradley DeviceNet
The following bus diagnoses can be used:
–
diagnosis by means of the DeviceNet scanner
–
diagnosis by means of the user program.
Diagnosis by means of the DeviceNet scanner
The valve terminal with field bus connection module for the
DeviceNet reacts on the DeviceNet as regards diagnosis like
equivalent DeviceNet slaves. Special error messages are not
displayed.
Diagnosis by means of the user program
You can evaluate the Device Failure table by means of the
user program. The Device Failure table is divided into several
sections. The section ”Communications failure bitmap” is
interesting in conjunction with the valve terminal. In this sec-
tion, an error bit is set for each DeviceNet slave if communi-
cation between the scanner and the slaves is interrupted or is
faulty.
The error bit is set for the valve terminal if:
–
the bus connection is interrupted (e.g. plug discon-
nected) or
–
if the bus interface is not supplied with power.
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