one of the OITs loses power all other OITs further down the chain will be unable to communicate to the PLC. The
OITs are wired together in the following fashion:
Soft ware Con nec tion
You must configure the OIT that connects to the PLC as the master. All other OITs should be configured as slave
OITs.
4
To configure the Master OIT
1.
Click the
Edit
menu on the main screen of EasyBuilder.
2.
At the bottom of the menu, click
System Parameters
. The Set System Parameters dialog box
appears.
3.
The dialog box has three tabs: PLC, General, and Indicator. Select the
PLC
tab.
4.
Select
Master
from the
Multiple OIT
box.
5.
Select either
38400
or
115200
for the
HMI-HMI link speed
. Make sure this setting matches
the settings for the slave OITs.
6.
Select a unique station number in the
OIT station no.
box.
7.
Click
OK
to save the System Parameters settings and return to the main screen of
EasyBuilder.
4
To configure the Slave OIT
1.
Click the
Edit
menu on the main screen of EasyBuilder.
2.
At the bottom of the menu, click
System Parameters
. The Set System Parameters dialog box
appears.
3.
The dialog box has three tabs: PLC, General, and Indicator. Select the
PLC
tab.
4.
Select
Slave
from the
Multiple OIT
box.
5.
Select either
38400
or
115200
for the
HMI-HMI link speed
. Make sure this setting matches
the setting for the master OIT.
6.
Select a unique station number in the
HMI station no.
box for each slave OIT.
7.
Click
OK
to save the System Parameters settings and return to the main screen of
EasyBuilder.
Shar ing Data Be tween the Mas ter OIT and Slave OIT
Each OIT can be programmed to access data from the PLC as though it were the only OIT connected to the PLC.
The master OIT will poll each slave OIT connected and allows each OIT to retrieve data from the PLC. You can
also exchange data between the slave OITs and the master OIT. Any local word registers (LW) or local bits (LB)
located in the master OIT can be accessed and written to by the slave OITs. Do this by using the Ms_LW and
Ms_LB memory registers. For example, if the master OIT is storing data in LW10, the slave OIT can access that
data by using Ms_LW10.
1010-1001a, Rev 02
Us ing EZware-500
71
Summary of Contents for Silver HMI504T
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