ProSoft Technology 5104-DNPS-PDPM - Manual (Page 44)

PDPM Protocol Configuration PDPM ♦ ProLinx Gateway
Protocol Manual PROFIBUS DP Master
Page 44 of 70 ProSoft Technology, Inc.
June 24, 2013
#(-1=watchdog not used)
Watchdog Timeout : 50 #.1 second intervals for watchdog timeout
Watchdog Reset Value : 255 #Value to set Profibus outputs to on
#timeout condition
4.1.1 Swap Input Bytes
Yes or No
This parameter specifies if the data in the input data area of the module is to be
byte swapped. If the order of the bytes in the words stored in the database is not
correct, use this option. A value of Yes causes the module’s program to swap the
bytes in each word. A value of No indicates no byte swapping will occur.
4.1.2 Swap Output Bytes
Yes or No
This parameter specifies if the data in the output data area of the module is to be
byte swapped. If the order of the bytes in the words stored in the database is not
correct, use this option. A value of Yes causes the module’s program to swap the
bytes in each word. A value of No indicates no byte swapping will occur.
4.1.3 Comm Failure Mode
0 or 1
This parameter sets the data transfer mode of the module's PROFIBUS input
image to the internal database when a communication failure on the PROFIBUS
interface is detected. If the parameter is set to 0, the input image will continue to
be transferred. If the parameter is set to 1, the input image will not be transferred
and the last values will be retained.
4.1.4 Watchdog Parameters
Watchdog Register : 1000 #DB register to monitor for change
#(-1=watchdog not used)
Watchdog Timeout : 50 #.1 second intervals for watchdog timeout
Watchdog Reset Value : 255 #Value to set Profibus outputs to on
#timeout condition
The watchdog functionality allows the module to set the PROFIBUS output
registers to a pre-defined value once a communication failure occurs. The
watchdog is implemented through the monitoring of a specific database register
(configured through the Watchdog Register parameter). The remote node should
write a new value to this database register faster than the timeout period
(configured through the Watchdog Timeout parameter). If this time period
elapses but no change is detected then the module will force all PROFIBUS
output registers to a specific value (configured through the Watchdog Reset
Value parameter).
In order to disable this functionality set the Watchdog Register to -1.