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4
I/O NUMBER ASSIGNMENT
4
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4.3 I/O Assignment by GX Developer
4.3.2 Concept of I/O assignment using GX Developer
3) Last I/O number
In I/O assignment, set the last I/O number not to exceed the maximum value
(
CHAPTER 2) of the I/O points.
An error ("MODULE LAYOUT ERROR") will occur if the last I/O number
exceeds the maximum value of the I/O points. (System monitor of GX
Developer shows "***" as an I/O address.)
(b) Precautions for automatic start XY assignment by CPU module
When the start XY is not yet entered, the CPU module automatically assigns it. In
the case of 1) or 2) below, therefore, the start XY setting of each slot may overlap
the one assigned by the CPU module.
1) Settings of I/O numbers were exchanged in the start XY
2) There are slots with start XY setting and those without start XY setting
(automatically assigned slot)
The following example Diagram 4.4 shows overlapping start XY.
Diagram 4.4 I/O assignment with overlapping start XY
Base unit
Diagram 4.5 Start XY set by above I/O assignment
Be extremely careful not to overlap the start XY of each slot.
Overlapping start XY will result in an error ("MODULE LAYOUT ERROR").
Automatically
assigned slot
CPU
0
1
2
3
32
32
32
40
20
40
H
H
H
5F
3F
5F
H
H
H
Start XY overlaps!
Slot number
Number of I/O points
I/O number
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