4
I/O NUMBER ASSIGNMENT
4.7 I/O Assignment Using GX Developer
4.7.2 Concept of I/O assignment using GX Developer
4 - 27
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication using
built-in Ethernet ports of
CPU module
8
Communication with
Intelligent Function
Module
(2) Precautions for I/O assignment
(a) Slot status after I/O assignment
When I/O assignment setting has been made to a slot, that setting has
precedence over the mounted module.
1) When the preset number of points is less than the number of I/O points
of modules actually mounted
The I/O points for actually mounted modules are decreased.
For example, when a slot, to which a 32-point input module is installed, is set
to a 16-point input module in I/O assignment setting, the second half 16 points
of the 32-point input module becomes invalid.
2) When the preset number of points is less than the number of mounted
intelligent function module points
An error (SP.UNIT LAY ERR.) occurs.
3) When the preset number of points is greater than the number of I/O
points of modules actually mounted
The points in excess of the mounted module points are not used by the I/O
module.
4) Mounted module and I/O assigned module type
The mounted module type and the set type in the I/O assignment setting must
be the same.
If not, normal operation will not be performed.
For the intelligent function module, make sure that the numbers of I/O points
are the same.
Table4.4 describes the operations performed when the mounted module type
differs from the one in the I/O assignment setting.
Table4.4 List of operations performed when mounted module differs from I/O assignment
Mounted module
I/O assignment
setting
Result
Input module
Output module
Input / Output conposite module
Intelli. / Interrupt Error(SP.UNIT.LAY.ERR.)
Intelligent function module
Input / Hi. input
Output / I/O mix
Error(SP.UNIT.LAY.ERR.)
Empty slot
Input / Hi. input
Output / I/O mix
Intelli. / Interrupt
Empty slot
All modules Empty Empty slot
Other combinations
Error does not occur but
normal operation is not
performed.
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