Mitsubishi Electric MELSEC-Q00U(J)CPU

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CHAPTER 2 APPLICATION OF PROGRAMMING
2
2.3 I/O Number Assignment 2.3.2 Setting I/O numbers
(3) Precautions
(a) Type setting
The type set in the I/O Assignment tab must be the same as that of the mounted module. Setting a different
type may cause incorrect operation. For an intelligent function module, the number of I/O points must also be
the same to the I/O assignment setting. The following table lists the operations when the mounted module type
differs from the one set in the I/O Assignment tab.
(b) I/O points of slots
The number of I/O points set in the I/O Assignment tab takes priority to that of mounted modules.
• When the number of I/O points is set to the number which is less than that of mounted I/O modules
The available number of I/O points for the mounted I/O modules will be reduced.
• When the number of I/O points is set to the number which is exceeding that of mounted I/O modules
The exceeded number of points will not be used in the I/O modules.
• Last I/O number
Set the last I/O number within the maximum number of I/O points. Failure to do so may cause an error
("SP. UNIT LAY ERR."). ("***" is displayed in "I/O Address" on the System Monitor screen.)
• When setting 0 points for empty slots
Setting "Empty" for Type and "0 Point" for Points even occupies one slot. To set slots after the specific slot
number unoccupied, set the number of slots in detail mode.
( Page 52, Section 2.2.1)
Mounted module
I/O assignment
setting
Result
Input module, output module,
I/O combined module
• Intelligent
• 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
• Intelligent
• Interrupt
Empty slot
All modules • Empty Empty slot
Other combinations -
Error does not occur but incorrect operation may
be caused. Or, error (PARAMETER ERROR (error
code: 3000)) is detected.
When the number of I/O points is set to 16 points in the I/O Assignment tab of the PLC parameter dialog
box for the slot where a 32-point input module is mounted, the second half 16 points of the module
becomes unavailable.
Ex.