40 D50 PLC User's Manual
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 on power loss.
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 used in LDR and
STO instructions 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.
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