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3. SPECIFICATIONS
3 - 6
MELSEC
GOT
3.3.4 Precautions when using the special module monitor function
The precautions to follow when using the special module monitor function are
discussed below.
(1) Special function modules that cannot be monitored
Modules displayed as "special" on the system configuration screen cannot be
monitored using the special module monitor function.
To monitor these modules, use the system monitor function "BM Monitor".
(2) Display when connecting the small building-block type PLC CPU
This precaution pertains to a situation where an expansion base unit for a large
building block type of setup is connected to a small building-block type CPU (such
as the A1SCPU) in a station connected to the GOT.
In such a case, the special function module on the large expansion base unit is
displayed on the system configuration screen with the same model name as that of
the small building-block type special function module.
If there is no small building-block type special function module, "special" is
displayed and the object module cannot be monitored.
(Example)
[Module Model] [Model Name Displayed]
AD72 A1SD71
AJ71ID A1SJ71ID
AJ71PT32-S3 A1SJ71PT32-S3
AD75P A1SD75P
A68AND A1S64AD
A68RD A1S62RD
(3) Monitoring restricted special function modules
(a) When monitoring the AD71 (S1, S2, S7)
When the slot on front of the AD71 module is an empty slot, monitoring is done
in the following way.
1) The AD71 is treated as the AD72, and "AD72" is displayed on the system
configuration screen.
In this case, when monitoring the AD71, select the AD72 in the object
display position.
2) The monitor screen that is displayed by 1) above is for the AD72.
The number obtained by subtracting 10H from the I/O signal number on the
display is the number to be used when installing the AD71 in the 0 slot.
∗
If you do not want the AD1 to be treated as the AD72, execute "Shift the
installation position of AD71 forward" or "In the I/O assignments, assign
the empty slot in front of AD71 to the 16 X-Y points."
(b) When monitoring the A68AD installed in the small building-block type PLC CPU
With the GOT, the A68AD that is installed in the expansion base unit for the
building-block type setup connected to the small building-block type CPU (such
as the A1SCPU) is recognized as the A1S68AD and monitored as such.
Since the buffer memory composition of the A68AD and the A1S68AD is not
the same, different data is displayed on the screen when monitoring the
A68AD(displayed as the A1S68AD).
∗
An A68AD that is installed in the base unit of the building-block type PLC
CPU (such as the AnUCPU) can be monitored normally.