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3 SPECIFICATIONS AND FUNCTIONS
Device
No.
RX(n+1)2
Axis 1
Drive unit
READY
RX(n+4)2
Axis 2
RX(n+1)3
Axis 1
Zero point
signal
RX(n+4)3
Axis 2
RX(n+1)4
Axis 1
In-position
signal
RX(n+4)4
Axis 2
RX(n+1)5
Axis 1
Near-point
dog signal
RX(n+4)5
Axis 2
RX(n+1)6
Axis 1
Stop signal
RX(n+4)6
Axis 2
RX(n+1)7
Axis 1
Upper limit
RX(n+4)7
Axis 2
RX(n+1)8
Axis 1
Lower limit
RX(n+4)8
Axis 2
RX(n+1)9
Axis 1
External
RX(n+4)9
Axis 2
start signal
RX(n+1)A
Axis 1
Speed/
RX(n+4)A
Axis 2
position
changeover
signal
RX(n+1)B
Axis 1
Deviation
RX(n+4)B
Axis 2
counter clear
signal
RX(n+1)C
Axis 1
Speed
RX(n+4)C
Axis 2
controlling
flag
RX(n+1)D
Axis 1
Speed/
RX(n+4)D
Axis 2
position
changeover
latch flag
Signal name
OFF: Drive unit READY
signal OFF
ON: Drive unit READY
signal ON
OFF: Zero point signal
OFF
ON: Zero point signal
ON
OFF: In-position signal
OFF
ON: In-position signal
ON
OFF: Near-point dog
signal OFF
ON: Near-point dog
signal ON
OFF: Stop signal OFF
ON: Stop signal ON
OFF: Upper limit signal
OFF
ON: Upper limit signal
ON
OFF: Lower limit signal
OFF
ON: Lower limit signal ON
OFF: External start signal
OFF
ON: External start signal
ON
OFF: Speed/ position
changeover signal
OFF
ON: Speed/ position
changeover signal
ON
OFF: Deviation counter
clear signal OFF
ON: Deviation counter
clear signal ON
OFF: Position being
controlled
ON: Speed being
controlled
OFF: Speed/ position
changeover not
executed
ON: Speed/ position
changeover
executed
This signal turns ON when the drive unit is normal and is ready to accept
feed pulses. (*
1
)
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. (*
This signal indicates ON/OFF of the in-position signal from the drive unit.
1
(*
)
This signal indicates ON/OFF of the near-point dog signal at a machine
zero point return. (*
1
)
This signal indicates ON/OFF of the stop signal. (*
This signal indicates ON/OFF of the upper limit signal. (*
This signal indicates ON/OFF of the lower limit signal. (*
This signal indicates ON/OFF of the external start signal. (*
This signal indicates ON/OFF of the speed/position changeover signal. (*
This signal indicates ON/OFF of the deviation counter clear signal. (*
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. (*
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. (*
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.)
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MELSEC-A
Details
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