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3 SPECIFICATIONS
3.5.2 Write data error code (buffer memory address: 0
3.5.3 Decimal point position (buffer memory address: 1
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Stores the error code and error-detected buffer memory address of the error detected
when write from PLC CPU to Q64TC buffer memory was performed.
b15
0
(1)
When data is written from the PLC CPU, the Q64TC checks:
• Whether write destination is read-only area or not
• Whether write destination is reserved area or not
• Whether write data range is proper or not
(2)
The following processings are performed at write error occurrence.
• Error code is stored (refer to Section 8.1 for error code details).
• Write error occurrence flag (Xn2) turns on.
(3) If more than one error has occurred, the error code and error occurrence address
of the error having the highest priority are stored. (Refer to Section 8.2 for details
of processing at error occurrence.)
(4)
Refer to Section 8.1 for error resetting.
(1) The decimal point position for the following data is stored according to the input
range setting which determines the measured temperature range.
• Temperature process value (PV)
• Set value (SV)
• Alert set value
"1" is stored if the input range of the measured temperature range with a decimal
point was set.
"0" is stored if the input range of the measured temperature range without a
decimal point was set.
(2) Refer to the following table when performing write/read of the above data from the
PLC CPU.
Decimal point
position
Buffer memory data is read as is and
0
used in sequence programs, etc.
One/tenth of the value read from a
1
sequence program or the like is used
as the actual value.
)
H
b4
b2
b0
to 4
)
H
H
For read
MELSEC-Q
Error code
Error occurrence address
For write
The specified value is written as is.
The value 10 times the specified
value is written.
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