REXROTH VisualMotion 9 - 508 User Watchdog Timeout; 509 Control System Timing Error (%D)

VisualMotion 9 Troubleshooting Guide Monitoring and Diagnostics 3-35
DOK-VISMOT-VM*-09VRS**-WA02-EN-P
508 User Watchdog Timeout
Cause:
The user watchdog timer enforces a time constraint on a user task or a
user interface.
Every time a nonzero timeout value is written to C-0-0021, a timer is
triggered in the control. If the timeout expires, the error "508 User
Watchdog Timeout" is issued. The timer is checked by the control every
50ms.
If C-0-0021 is set to zero, the watchdog timer is disabled. If it is nonzero,
it is active when the control is in run mode, there are no errors, and the
task specified in C-0-0022 is running.
In a user program task, parameter C-0-0021 can be written to via a
parameter transfer at the beginning of the main processing loop. If the
VisualMotion system tasks or the user program events are consuming too
much processor time, the time set in C-0-0021 will elapse, and error 508
will be issued. The programmer can then adjust the timing of the events,
or increase the SERCOS or I/O cycle times to allow more time for the
user task.
Remedy:
1. If this feature is intentionally set and the user's desired elapse time,
programmed in parameter C-0-0021, can be increased, the user can
modify the value in parameter C-0-0021.
2. If this feature is not desired but a value other than zero appears in
parameter C-0-0021, change this value to zero to disable this feature.
509 Control System Timing Error (%d)
Cause:
When the control is powered up, a timer monitors high-level control task
and generates this error if the system timing overlaps.
The cause for timeout can also result from electromagnetic interference
on serial communications.
Remedy:
1. The default SERCOS cycle time is 2000 µsec. Applications that
require multiple functionality, such as coordinated motion using
Fieldbus interface across serial communications, should double the
value of control parameter C-0-0099 (SERCOS Cycle Time). Switch
the system in and out of parameter mode to update the SERCOS
ring.
2. If the increase in SERCOS Cycle Time does not help, contact Bosch
Rexroth Service for assistance.
3. Check or replace the Serial Communication cable.