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CHAPTER 3 SPECIFICATIONS
3
3.3 I/O Signals Transferred to/from the CPU Module
3.3.2 Details of input signals
(6) E
2
PROM write completion flag (Xn8)
Turning E
2
PROM backup instruction (Yn8) on from off starts the writing of the buffer memory data to the
E
2
PROM. After the data writing is completed, this flag turns on. Turning E
2
PROM backup instruction (Yn8) off
from on also turns off this flag.
For details on the data writing to the E
2
PROM, refer to the following.
Page 270, Section 4.30
(7) Default value write completion flag (Xn9)
Turning Default setting registration instruction (Yn9) on from off starts the writing of the default value of the
Q64TCN to the buffer memory. After the data writing is completed, this flag turns on. Turning Default setting
registration instruction (Yn9) off from on also turns off this flag.
(a) Unused channel
For unused channels (which temperature sensors are not connected to), CH Unused channel setting
(Un\G61, Un\G93, Un\G125, Un\G157) must be set to Unused (1) after the completion of the writing of the
default value.
If not, the ALM LED blinks.
For details on the unused channel setting, refer to the following.
Page 297, Section 5.5
ON
OFF
ON
OFF
Before write to
E
2
PROM
During write to
E
2
PROM
Completion of write to
E
2
PROM
E
2
PROM backup instruction
(Yn8)
Execution status of
E
2
PROM write
E
2
PROM write completion
flag (Xn8)
Executed in a sequence program
Executed by the Q64TCN
Default setting registration instruction
(Yn9)
Buffer memory
Default value write completion flag
(Xn9)
User setting
value
Default value
OFF
OFF
ON
ON
During default setting
registration
Executed in a sequence program
Executed by the Q64TCN