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MELSEC-
A
3 SPECIFICATIONS AND FUNCTIONS
Device
No.
Signal name Details
RX(n+1)2
RX(n+4)2
Axis 1
Axis 2
Drive unit
READY
OFF: Drive unit READY
signal OFF
ON: Drive unit READY
signal ON
This signal turns ON when the drive unit is normal and is ready to accept
feed pulses. (*
1
)
RX(n+1)3
RX(n+4)3
Axis 1
Axis 2
Zero point
signal
OFF: Zero point signal
OFF
ON: Zero point signal
ON
This signal indicates the zero point signal at a machine zero point return.
The zero point signal of a pulse encoder, etc. is used generally. (*
1
)
RX(n+1)4
RX(n+4)4
Axis 1
Axis 2
In-position
signal
OFF: In-position signal
OFF
ON: In-position signal
ON
This signal indicates ON/OFF of the in-position signal from the drive unit.
(*
1
)
RX(n+1)5
RX(n+4)5
Axis 1
Axis 2
Near-point
dog signal
OFF: Near-point dog
signal OFF
ON: Near-point dog
signal ON
This signal indicates ON/OFF of the near-point dog signal at a machine
zero point return. (*
1
)
RX(n+1)6
RX(n+4)6
Axis 1
Axis 2
Stop signal OFF: Stop signal OFF
ON: Stop signal ON
This signal indicates ON/OFF of the stop signal. (*
1
)
RX(n+1)7
RX(n+4)7
Axis 1
Axis 2
Upper limit OFF: Upper limit signal
OFF
ON: Upper limit signal
ON
This signal indicates ON/OFF of the upper limit signal. (*
1
)
RX(n+1)8
RX(n+4)8
Axis 1
Axis 2
Lower limit
OFF: Lower limit signal
OFF
ON: Lower limit signal ON
This signal indicates ON/OFF of the lower limit signal. (*
1
)
RX(n+1)9
RX(n+4)9
Axis 1
Axis 2
External
start signal
OFF: External start signal
OFF
ON: External start signal
ON
This signal indicates ON/OFF of the external start signal. (*
1
)
RX(n+1)A
RX(n+4)A
Axis 1
Axis 2
Speed/
position
changeover
signal
OFF: Speed/ position
changeover signal
OFF
ON: Speed/ position
changeover signal
ON
This signal indicates ON/OFF of the speed/position changeover signal. (*
1
)
RX(n+1)B
RX(n+4)B
Axis 1
Axis 2
Deviation
counter clear
signal
OFF: Deviation counter
clear signal OFF
ON: Deviation counter
clear signal ON
This signal indicates ON/OFF of the deviation counter clear signal. (*
1
)
RX(n+1)C
RX(n+4)C
Axis 1
Axis 2
Speed
controlling
flag
OFF: Position being
controlled
ON: Speed being
controlled
This flag is ON during speed control and is used to judge whether speed
control or position control is being executed.
During speed/position changeover control, this flag is ON until speed
control is switched to position control by an external speed/position
changeover signal.
This flag turns OFF at power-on or at start of position control, JOG
operation or manual pulse generator operation. (*
1
)
RX(n+1)D
RX(n+4)D
Axis 1
Axis 2
Speed/
position
changeover
latch flag
OFF: Speed/ position
changeover not
executed
ON: Speed/ position
changeover
executed
During speed/position changeover control, this flag turns ON when speed
control is switched to position control and is used as a movement amount
change enable/disable interlock in position control.
This flag turns OFF at start of next positioning data execution, JOG
operation or manual pulse generator operation. (*
1
)
n: Address assigned to the master module by station number setting
*
1
: Updated every 56.8ms. (Not updated when processing is
completed within 56.8ms.)