Mitsubishi Electric FX3G SERIES Programming Manual page 764

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Operation of state relays and use of an output
two or more times
• In different state relays, the same output device (Y002 in this
example) can be programmed as shown in the right figure.
In this case, when S21 or S22 is ON, Y002 is output.
However, if the same output coil (Y002) in a state relay is
programmed in a ladder block program or if the same output
coil is programmed twice in one state relay, it is handled in
the same way as general double coil.
Interlock of outputs
• In the state relay ON status transfer process, both states
turn ON at the same time only momentarily (during one
operation cycle).
Accordingly, between a pair of outputs which should not be
set to ON at the same time, provide an interlock outside the
PLC in conformance to the handy manual of the PLC so that
simultaneous driving can be prevented.
In addition, provide on interlock in the program as shown in
the right figure.
Use of a timer two or more times
• In the same way as an output coil, a timer coil can be
programmed in different state relays. However, it is not
permitted to program the same timer coil in adjacent state
relays. If the same timer coil is programmed in adjacent
state relays, the timer coil is not set to OFF at process
transfer, so the current value is not reset.
Output driving method
• It is not permitted to program an instruction without a contact after an LD or LDI instruction from a bus line in a state
relay.
Change such a circuit as shown below.
10
10
762
Y001
X005
Y002
Y003
Change
Y001
Y003
X005
Y002
Move the
position.
20
21
22
Y002
20
Y001
21
40
41
42
Change
10
or
35 SFC Program and Step Ladder
35.1 SFC Program
Y001
Y002
When S21 or
S22 is ON,
Y002 is output.
Y002
Y001
Forward
rotation
Y002
Backward rotation
T1
K10
Not
T1
allowed
T1
K20
Y001
X005
Y002
M8000
Y003
RUN
Insert "Always ON"
monitor
contact.