Maple Systems MAPware-100 User Manual

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Note: If you are experiencing problems with communicating with the selected PLC, first

verify that the communication parameters are set to the default by clicking on the

Default button on the mouse.

OIT - PLC Interface Settings Group Box
This group box is used to set all of the addresses for communicating with the PLC. There are

three registers that are required for the OIT to operate: The Message Request Register, the

Function Key Coils, and the Status Coils.
The message request register (MRR) address is set in the text box in the Message group box. This

the MRR must change before the OIT will acknowledge that a new message or alarm must be

displayed. Checking the BCD Format check box causes the OIT to interpret the value in the

Message Request Register as a Binary Coded Decimal (BCD) value. If this box is not checked, the

value is interpreted as a Decimal number.
The function key coils are used by the OIT to write information about function key activity to

the PLC. The function key coils are continuously read by the PLC ladder logic program to

determine what action to take when a key is pressed or released. The OIT updates this

Function Key Coils group box. Checking the Retentive check box causes the OIT to read and

return the values of the Function Key Coils when the OIT powers up. If this box is not

checked, all of the Function Key Coils are reset when the OIT powers up.
The status bit coils are used by the OIT and PLC to communicate status information between

the devices. The use of each status bit is explained in the “Operation” chapter of the OIT

Family Operation Manual. The status bit coils address is set in the text box in the Status Coil

group box.
The Address group box is used to specify the PLC address. Some PLCs require that a PLC address

be used in order to communicate with them.
The Source and Destination group boxed are only used in selected PLC protocols. Refer to

the Protocol Guides for more information.
The PLC password may be set in the Password group box. Several PLCs require the

password to be entered prior to any register or coil transaction.

OIT Options Group Box
Three items exist within the Options box: screen saver settings, supervisor settings, and

passwords.

Screen Saver Editor

Use of the screen saver will extend the life of the vacuum florescent display used in the

MAP340D. Maple Systems recommends the use of the screen saver on these models. To

enable the screen saver, check the Enable box and click on the Define button within the

Screen Saver box. The following window will be displayed:

OPERATION

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