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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
14 Handy Instruction – FNC 60 to FNC 69
14.1 FNC 60 – IST / Initial State
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
4. Special auxiliary relay (M) for IST instruction
Auxiliary relays (M) used in IST instruction are classified into two types. Some auxiliary relays are automatically
controlled by IST instruction itself according to the situation. Other auxiliary relays should be controlled by a program
for preparation of operation or for purpose of control.
1) Special auxiliary relays automatically controlled by IST instruction
a) M8040: STL transfer disable
When this special auxiliary relay turns ON, transfer of every state is disabled.
Individual operation mode:
M8040 is always effective.
Zero return operation mode and cycle operation mode:
When the stop button is pressed, the operation is held until the start button is pressed.
Stepping operation mode:
M8040 is always effective except when the start button is pressed. When the start button is
pressed, M8040 is not effective and transfer of states is allowed.
Others: The operation is latched when the PLC mode switches from STOP to RUN, and reset when the start
button is pressed.
Even in the transfer disabled status, the operation is held for outputs in the states.
b) M8041: Transfer start
This special auxiliary relay allows transfer from the initial state S2 to the next state.
Individual operation mode and zero return operation mode:
M8041 is not effective.
Stepping operation mode and cycle operation mode:
M8041 is effective only while the start button is pressed and held.
Continuous operation mode:
The operation is latched when the start button is pressed, and cleared when the stop button is
pressed.
c) M8042: Start pulse
M8042 is activated instantaneously only when the start button is pressed.
d) M8047: Enable STL monitoring
When IST instruction is executed, M8047 is set to ON.
When the M8047 turns ON, STL monitoring becomes valid, and state relay numbers (S0 to S899) in the ON
status are stored in turn in the ascending order of device number to the special auxiliary relays D8040 to
D8047.
Up to eight state relay numbers in the ON status can be monitored.
If either state relay is ON, the special auxiliary relay M8046 is set to ON.
2) Auxiliary relays controlled by a sequence program
→ For details of these controls, refer to the next page.
a) M8043: Zero return complete
Set this special auxiliary relay (M) to ON by a user program when the machine returns to the zero point in the
zero return operation mode.
b) M8044: Zero point condition
Detect the zero point condition of the machine, and drive this special auxiliary relay. This signal is effective in
every mode.
c) M8045: All output reset disable
When the mode is switched among individual operation mode, zero return operation mode and automatic
mode, all outputs and operation state relays are reset if the machine is not located at the zero point.
If M8045 has been set to ON in advance, however, only operation state relays are reset.