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I/O Allocation Method
I/O Allocation Tab Pages (Device - Parameter - Edit)
There are three ways to allocate I/O.
1.
Manual Allocation Using the Edit Window
Select a slave device from the Registered Device List and click the Edit Button. Use the Edit Window to
manually allocate memory to each slave.
2.
Allocation Using a Drag-and-drop Operation
Drag a device from the Registered Device List and drop it at the corresponding word location in the
memory block that you want to allocate.
3.
Auto-allocation
Select a device from the Registered Device List and click the Auto Button. This enables auto-allocation
for unused words. (A device for which the user setting was performed using the Advanced Setup Button
on the General Tab Page, however, cannot be automatically allocated.)
Note: An image like the following will be displayed in the Size Field of the Registered Device List for the I/
O data size of a device for which multiple connections are set on the General Tab Page.
To allocate the I/O on the left using a drag-and-drop operation, drag it with the left button on the
mouse. To allocate the I/O on the right using a drag-and-drop operation, drag with the right button on
the mouse. When there is only one connection, use the left button on the mouse.
Manual Allocation Using the Edit Window
Edit Button on an I/O Allocation Tab Page
Use the following procedure to allocate manually using the Edit Window.
1.
Select the device for which you want to edit the I/O allocation.
2.
Click the Edit Button.
3.
The Edit I/O Allocation Dialog Box will be displayed. Examples are shown below.
Specify Block 1 or 2, the allocated word, start byte (low byte: Low, high byte: High), and the number of
allocated bytes (occupied).
Specify the start word to allocate and the number of allocated bytes.
Byte location (i.e., high/low) can also be specified with the allocated word setting. When the number of
allocated bytes is 2 bytes or more, you must specify Low.
Allocating One Low Byte to a Device
+0CH
+1CH
+2CH
B-4 Manual I/O Allocation
High
15
8 7
Connections are specified in the General tab
with the advanced setup function
Low
0
#00
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