Maple Systems OIT Family - Manual (Page 76)

When the OIT powers up, the global function keys can be initialized in one of two
modes: Default or Retentive. In default mode, each global function key coil in the PLC is
reset according to the configuration of each global function key:
• If the global function key is configured as Screen Display or Disabled, no change is made
to the global function key coil in the PLC.
• If the global function key is configured as Push On/Off, Latched, or Momentary, the
global function key coil in the PLC is cleared to 0.
In retentive mode, each global function key coil in the PLC is read and the state of each
Push On/Off global function key is set to match. This ensures that a process controlled by a
Push On/Off function key is not stopped just because the OIT reinitialized during operation.
Configuring the global function keys:
1. From the Configuration menu, choose Keyboard Settings, then choose Function Key
Editor. The Function Key Editor dialog box appears.
2. In the Function Key Coils Starting Address group box, select the starting PLC coil
address to use for the global function key coils. The global function key coils are a
consecutive block of coils, one for each global function key on your OIT, that start at
the selected PLC address.
3. In the Retentive Mode group box, select the Enable check box if you want the global
function key coils in the PLC to retain their last known state when the OIT reinitializes.
For more information, refer to the OIT Initialization section in this chapter.
4. In the Assignment group box, choose the option button that corresponds to the global
function key you want to configure.
5. In the Action group box, choose the action this global function key will perform.
Key Types 76
1010-0099, Rev. 07