Soft Ware Con Nec Tion; Shar Ing Data Be Tween The Mas Ter Oit And Slave Oit - Maple Systems Silver Series Installation And Operation Manual

Us ing EZware-500
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.
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.
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.
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