Diagnostics and Troubleshooting
MVI46-PDPS
♦
SLC Platform
Profibus DP Slave Communication Module
ProSoft Technology, Inc.
Page 43 of 72
April 30, 2008
Bit
Designation
Significance
0
Reserved
1
Clear_Data
With this command the ASCI output data is deleted in data
transfer buffer and is changed to next transfer data buffer
contents.
2
Unfreeze
With 'Unfreeze': freezing input data is cancelled.
3
Freeze
The ASCI input data is fetched from next transfer buffer to data
transfer buffer and frozen. New input data is not fetched again
until the master sends the next 'Freeze' command.
4
Unsync
The 'Unsync' command cancels the 'Sync' command.
5
Sync
The ASCI output data transferred with a WRITE_READ_DATA
telegram is changed from data transfer buffer next state buffer.
The following transferred output data is kept in data transfer buffer
until the next 'Sync' command is given.
6,7
Reserved
The Reserved designation specifies that these bits are reserved
for future function expansions.
4.2 LED
Indicators
Troubleshooting the operation of the PROFIBUS Slave port can be performed
using several methods.
The first and quickest is to scan the LEDs on the module to determine the
existence and possibly the cause of a problem. This section provides insight into
the operation of the PROFIBUS Slave Port status LEDs.
4.2.1 LEDs for the PROFIBUS Slave Port
ACTIVE ERROR
Description
Flashing On
PROFIBUS communication problem (not
receiving output)
Off On
Module configured and waiting for first output
data set.
Flashing together
Configuration error during initialization.
Alternate
flashing
Watchdog timer expired.
On Off
Normal
operation.
On Rapid/irregular
flash
Configuration problem from master.
Off
Flashing
User timeout expired.
Off Off
Module not receiving power or program
terminated.