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GFK-2746
1 Introduction
configured with "False" for the swap bytes input for proper operation. INTEL
format is little endian, therefore ensure that in the IO modules connected to the
node are configured with "True" for the swap bytes input for proper operation.
2. Stop Action: If a network fault is detected within the specified watchdog time
base, the outputs of a slot under test of I/O station will acquire output values as
per the options specified in DP clear action. The options are:
a. Clear Output images to 0: The communication between STXPNS001 and
slots will run. All outputs of Slot will be cleared. The output value should
be set to '0' but Bus will run (IO status LED would be green)
b. Hold Last Valid Output image: The communication between STXPNS001
and slots will run. All outputs of Slot will hold last value but Bus run (IO
status LED would be green)
c. Depends on IO Fault Action Parameters: The communication between
STXPNS001 and slots will be stopped. Slots will control IO Data by itself.
The output value should be ON/OFF by Fault action which it is depended
on IO fault action. Bus should be ready status (IO status LED would be
blinked). In order to configure the I/O module for fault action, go to
"Modules" tab and select properties. For example, I have used ST-4522.
Upon network fault, a user can configure the Module action as shown
below. Note that substitute value low or high denotes low or high byte
values.
3. Reaction to Bus Error: If Bus error is detected, the behavior of the network
module will be as per the options selected below:
a. Clear Input Image: Input values will be zero. NET LED will be Green.
Network adaptor communication with master intact. IO LED will be red
and fault "Loss/addition of device' logged in I/O fault table. Ensure that –
Chapter Chapter
5-17
Figure 46: Module Parameters tab
5
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