630
8 APPLICATION INSTRUCTION
8.19 Initial State
■
IST instruction equivalent circuit
• The details on special relays (M) and initial state relays (S0 to S9) which are automatically controlled by the IST instruction
is as shown in the equivalent circuit below. (Refer to the equivalent circuit below for reference.) This equivalent circuit
cannot be programmed.
• When the operation mode is switched among the individual operation, zero return operation and automatic operation,all
outputs and conventional states are reset at one time unless the machine is located in the zero point. (Reset of all outputs
is not executed when SM8045 is driven.)
X24
SM8041
SM8041
Continuous
operation
X27
SM8041 is set to ON when the start button
is pressed in the automatic mode.
Especially in the continuous mode,
SM8041 holds its status by itself, and is
reset when the stop button is pressed.
Stop
X22
Stepping
operation
X23
Cycle
operation
X24
Continuous
operation
Transfer
start
X26 Automatic start
X26 Automatic start
X20
Individual
operation
Start pulse
X25 Zero return start
SM8042
X20
SM8040
Individual operation
STL transfer
disable
X21
Zero
return X027
SM8042
Start pulse
Stop
X22 Stepping operation
X23 Cycle
operation
X027Stop
SM8002Initial pulse
SM8040Self-holding
SM8000
SM8047
RUN monitor
Enable STL monitoring
X20
Individual
operation
S 0
SM8044
Zero point
condition
SM8043
Zero return
complete
X21 Zero return
S 1
X25
Zero return
start
Zero return
complete signal is
reset
SM8043
RST
PLS
X22 to X24
Automatic
operation
Zero return
complete
SM8043
SM8041
Transfer start
S 2
SM8040 is set to ON in the stepping
mode, and set to OFF every time the
start button is pressed.
In the zero return operation or cycle
operation, SM8040 holds its status by
itself when the stop button is pressed,
and is reset when the start button is
pressed.
The initial state is switched according to
each mode input, and SM8043 is
controlled at the same time.
However, it is necessary to control
SM8044 and SM8043 in user programs
also.
Zero return
X21
Automatic
X22 to X24
S1
SM8043
Switched
to X020
(individual
operation)
Zero return
complete
S2
Conventional states and
corresponding outputs are
reset at one time.
Individual
operation
X20
Automatic
X22 to X24
Switched
to X21
(zero
return
operation)
S2
When SM8045 is OFF, all
outputs are reset.
All output reset disable
S
M
8045
Even if the mode is switched from automatic operation to zero return operation while S2 is ON, state relays
(except initial state relays) and outputs are not reset.
Summary of Contents for MELSEC iQ-F FX5
Page 1: ...MELSEC iQ F FX5 Programming Manual Instructions Standard Functions Function Blocks ...
Page 2: ......
Page 17: ...15 CONTENTS ...
Page 24: ...22 MEMO ...
Page 1050: ...1048 26 TIME DATA FUNCTIONS 26 4 Division MEMO ...
Page 1068: ...1066 29 COUNTER FUNCTION BLOCKS 29 4 Counter Function Block Operation error There is no error ...
Page 1107: ...I 1105 MEMO ...
Page 1111: ......