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Manual – MOVIPRO® SDC with DeviceNet Interface
51
7
Diagnostic procedure
Error Diagnostics for Operation on the DeviceNet Fieldbus
7
Error Diagnostics for Operation on the DeviceNet Fieldbus
7.1
Diagnostic procedure
The diagnostic procedures described in the following section demonstrate the fault anal-
ysis methods for the following problems:
• MOVIPRO
®
does not work on DeviceNet
• MOVIPRO
®
cannot be controlled using the DeviceNet master
7.1.1
Step 1: Check the Status LED and the Status display of the DeviceNet scanner
See documentation of the DeviceNet scanner.
7.1.2
Step 2: Check the Status LEDs of the MOVIPRO
®
See chapter "Status LED" (page 23).
7.1.3
Step 3: Error diagnostics
If the MOVIPRO
®
status is "Connected" or "Module error" (LED S1 lights up green), the
data exchange between master (scanner) and slave (MOVIPRO
®
) is active. If it is still
not possible to transmit data to the MOVIPRO
®
across DeviceNet, the following steps
should help you to diagnose the error.
A Are the correct values for the process data words displayed in the parameter tree?
If yes, continue with F.
B Is bit 0 in the DeviceNet control register of the PLC set to "1" to activate the exchange
of process data?
C Are the process data words copied to the right offset in the Local I/O tag of the Devi-
ceNet scanner? Check the tags and scanner mapping.
D Is the PLC in RUN mode or does active forcing overwrite the transfer of the normal
process data words?
E If the PLC is not sending data to the MOVIPRO
®
, consult the PLC manufacturer.
F If the cycle time for exchanging process data is longer than expected, calculate the
bus load.
Example:
64 process data words from and to a DeviceNet slave are transmitted in ca. 11 ms
at a baud rate of 500 kBaud. When operating 2 units with 64 process data words
each, the shortest possible cycle time is about twice as long: ca. 22 ms. Halving the
baud rate means doubling the cycle time.