Maple Systems OIT Family - Manual (Page 33)

Recipe Screens
Recipe screens are screens that, when displayed on the OIT, allow the operator to
download or upload preset values into PLC registers. These preset values are configured
when programming the OIT and can also be modified (OIT3100/4100 Series only) at any
time by the OIT operator. Recipe screens allow the OIT operator to configure and start a
batch process.
Each recipe screen can include up to 20 ‘preset’ values. Each recipe screen also includes:
• An initiator, which is a single character in the bottom right corner of the recipe screen that
the OIT operator must change from ‘N’ to ‘Y’ to download the recipe to the PLC.
• A gate coil, which is a PLC relay coil that the OIT uses to signal the PLC that the recipe has
been downloaded and the batch process is ready to start (optional on the OIT3100/4100
Series).
On the OIT3100/4100 Series, you can also configure any Screen-Dependent Function
Key to upload or download a recipe. The PLC/Controller has the ability to send an
upload or download command to the OIT using the Message Request Register.
To download a recipe using the OIT keypad:
1. Display the Recipe Screen using a pre-programmed key or from a screen request by the
PLC.
2. When the recipe screen is initially displayed, the initiator is set to “N” and the gate
coil is set to “off” (the off state is configured by the system programmer to be either 0
or 1).
3. The OIT operator can use the arrow keys on the OIT keypad to move the focus cursor
to alter any recipe presets or other register monitors that are on screen.
4. To download using the recipe initiator, move the cursor to the initiator using the arrow keys.
Press the TOGGLE key to change the recipe initiator from “N” to “Y”. Then press the
ENTER key to begin the download process.
5. To download using a screen-dependent function key, press the function key when the recipe is
displayed. It is not necessary to change the recipe initiator. If the recipe screen is not already
displayed, pressing the screen dependent function key will display and download the recipe.
See section “Screen Dependent Function Keys” in Chapter 6: Key Types for information about
how to program the key to download a recipe.
6. The OIT writes the preset values to the predefined PLC registers and sets the gate coil
to the ‘on’ state. By setting the gate coil to the on state, the OIT signals the PLC that
the recipe has been downloaded and the batch process is ready to start.
To download a recipe using the message request register (MRR).
1. The PLC can start the download of a recipe by placing the screen number associated
with that screen in the Message Request Register, (see “PLC Screen Request” section in
Chapter 5: Displaying Stored Screens for m ore information about the Message Request
Register). To get the OIT to download the recipe, add +1000 to the screen number
before placing it into the MRR.
2. The OIT will read the MRR and display the recipe.
3. The OIT will automatically download the recipe.
4. The recipe screen will remain on the OIT display until another screen is requested.
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