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(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.
(b) I/O points of slots
The I/O assignment setting is used irrespective of the mounted module.
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.)
Table4.1 Incorrect operation when the module type differs
Mounted module I/O assignment setting Result
Input module, output module,
I/O combined module
• Intelli.
• Interrupt
Error (SP.UNIT.LAY.ERR.)
Intelligent function module
• Input
• Hi. input
• Output
•I/O combined
Error (SP.UNIT.LAY.ERR.)
Empty slot
• Input
• Hi. input
• Output
•I/O combined
• Intelli.
• 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)).
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