Chapter 3
.
PROFIBUS Network Adapters
GFK-2746B
PACSystems* RSTi PROFIBUS and PROFINET Network Adapter
–August 2013
49
Five parameters can be configured as follows:
1.
Watchdog time base
: The watchdog timer can be used for detection of a network
fault. If the Network Adapter detects a network error within the watchdog time,
STXPBS001 will control slots depending on the values in DP Clear Action. Options
are 10ms and 1ms.
2.
Word Data Format
: The options are MOTOROLA & INTEL.
MOTOROLA
(big endian): The Swap Bytes parameter must be set to False for the IO
modules connected to the node.
INTEL
(little endian): The Swap Bytes parameter must be set to true for the IO
modules connected to the node.
3.
DP Clear Action
: If a network fault is detected within the specified watchdog time
base, the outputs of an I/O station will acquire values as per the options specified in
DP clear action. The options are:
a.
Bus Stop (I/O Fault action)
: The communication between STXPBS001 and
modules will be stopped and each module will control its IO Data according
to the Fault Action selected for it. The Bus status will be ready (IO status LED
will blink). To configure the I/O module for fault action, go to the Modules tab
and select Properties. The example below uses an ST-4522 module. Note
that substitute value low or high denotes low or high byte values.
b.
Bus Run (Clear output)
: The communication between STXPBS001 and
modules will run. All the modules
’ outputs will be set to 0. The IO status LED
will be green.
c.
Bus Run (Hold output)
: The communication between STXPBS001 and
modules will run. All module outputs will hold the last value but bus will run.
The IO status LED will be green.
4.
Reaction to Bus Fault:
If Bus error is detected, the behavior of the network module
will be as per the op
tions selected below. It should be noted that “Restart to Bus
Fault” should be set to “Power restart” for this parameter to behave appropriately.
Note that in order to observe a “loss of Device” in IO fault table , the “slave status
Fault table entries” must be set to “true” in the GE IP PROFIBUS master settings tab
as shown below:
Summary of Contents for PACSystems RSTi
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