Mitsubishi Electric MELSEC FX3U Programming Manual page 816

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Transfer of state relay ON status by a same signal
In some cases, it is necessary to transfer the state relay ON status by the ON/OFF operation of one
pushbutton switch.
To achieve such a transfer, it is necessary to convert the transfer signal into pulses in programming.
The following two methods are available to convert the transfer condition into pulses:
1. Procedure using PLS instruction
Immediately after M0 turns ON and then S50 turns ON, the
transfer condition M1 (NC contact) is open. As a result, it
is not possible to transfer the ON status to S51 at the same
time when S50 turns ON.
When M0 turns ON again, the ON status is transferred to
S51.
2. Procedure using a pulse contact instruction
(M2800 to M3071)
By using an auxiliary relay M2800 to M3071 in a rising/
falling edge detection instruction (LDP, LDF, ANDP,
ANDF, ORP or ORF), the ON status can be efficiently
transferred by the same signal.
When M2800 or later is specified as a device in a rising/
falling edge detection instruction, only the first rising/falling
edge detection instruction after a coil instruction is
executed. Accordingly, when X001 is set to ON, only the
transfer condition in a state relay currently in the ON status
is ON during one operation cycle, and then the ON status
is transferred to the next state relay.
*1. It is alright to program a device number used in LD, LDI, OR or ORI instructions after a corresponding
coil in the ladder block. However, if a same device number is programmed in LDP, LDF, ANDP,
ANDF, ORP or ORF instruction, the priority is given to such an instruction and the transfer condition is
not effective.
814
35 SFC Program and Step Ladder
Pulse signal
M0
1
50
PLS
M1 M0
2
51
PLS
M2 M0
3
(Transfer input)
X001
Ladder block
M2800
M2800
SFC block 0
1
50
2
51
3
35.1 SFC Program
TRAN
M1
TRAN
M2
TRAN
M2800
*1
M2800
TRAN
M2800
TRAN
M2800
TRAN