Mitsubishi 00JCPU User Manual page 123

(3) Precautions
(a) Type setting
The type set to the I/O assignment tab must be the same as that of the mounted module.
Setting a different type may cause incorrect operation.
For the intelligent function module, the I/O points must also be the same in addition to the I/O assignment
setting.
Table4.1 shows the operations when the mounted module type differs from the one in the I/O assignment tab.
Mounted module
Input module, output module,
I/O combined module
Intelligent function module
Empty slot
All modules
Other combinations
(b) I/O points of slots
The number of I/O points for each slot selected in the I/O assignment tab is set in priority to those of mounted
modules.
1) When the preset number of I/O points is less than those of mounted I/O modules
The available points for the mounted I/O module will be decreased.
For example, when the number of I/O points is set to 16 points in the I/O assignment setting of PLC
parameter to the slot where a 32-point input module is mounted, the second half 16 points of the 32-point
input module becomes unavailable.
2) When the preset number of I/O points exceeds those of mounted I/O modules
The exceeded number of points will not be used in I/O modules.
3) Last I/O number
Set the last I/O number within the I/O point range.
Failure to do so causes an error ("SP. UNIT LAY ERR."). ("***" is displayed as an I/O address on the System
monitor screen of GX Developer.)
4) When setting 0 points in empty slots
Setting "Empty" and "0" to type and points respectively even occupies one slot.
To set any slots unoccupied after the specific slot number, set the number of slots in detail mode.
( )
Section 4.1.1
CHAPTER4 ASSIGNMENT OF BASE UNIT AND I/O NUMBER
Table4.1 Incorrect operation when the module type differs
I/O assignment setting
• Intelli.
• Interrupt
• Input
• Hi. input
• Output
• I/O combined
• Input
• Hi. input
• Output
• I/O combined
• Intelli.
• Interrupt
• Empty
–
Result
Error (SP.UNIT.LAY.ERR.)
Error (SP.UNIT.LAY.ERR.)
Empty slot
Empty slot
No error but the system will not operate normally.
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