Chapter 5: CPU Operation and Memory
57
F1.0 to F1.15 (F1 word register) Special Application Functions
Address
Function
Details
Note
F1.0
First single scan
Maintain On state for first single-scan period, when
the CPU changes its status from Stop to Run.
F1.1
Scan clock
Cycle On/Off state for each scan during the
program. (1Scan On, 1Scan Off)
F1.2
0.02 sec. Clock
10 ms: On, 10 ms: Off
10ms 10ms 10ms
F1.3
0.1 sec. Clock
50 ms: On, 50 ms: Off
50ms 50ms 50ms
F1.4
1 sec. Clock
500 ms: On, 500 ms: Off
500ms 500ms 500ms
F1.5
Instantaneous interrupt
On when power is off for over 20 ms.
Maintained
F1.6
Execute status
On when the CPU is in the run state.
F1.7
Keep error display
On when the K retentive data is destroyed and/or
changed.
F1.8
Carry Flag
On in the event of carry when performing math
instructions (ADD, SUB, etc.)
F1.9
Division by zero error
On when the denominator of division commands is
zero.
F1.10
Range designation error
On when the absolute address exceeds the
specified range.
F1.11
Reserved
System use.
Do not use.
F1.12
Reserved
System use.
Do not use.
F1.13
Reserved
System use.
Do not use.
F1.14
Reserved
System use.
Do not use.
F1.15
Reserved
System use.
Do not use.
Note:
The 16 bits in the F1 address provide the CPU's special function and self diagnosis result. They
are used for status contacts only, and are not used to modify or control the PLC. Only the F1.5
instantaneous interrupt display contact should be used as an output contact by the user, to be
turned off after power loss indication.
Summary of Contents for D320 PLC
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Page 18: ...6 D320 PLC User s Manual...
Page 28: ...16 D320 PLC User s Manual...
Page 34: ...22 D320 PLC User s Manual...
Page 78: ...66 D320 PLC User s Manual...
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