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MELSEC-A

3 SPECIFICATIONS AND FUNCTIONS

Device

No.

Signal name

Details

RX(n+1)E
RX(n+4)E

Axis 1
Axis 2

Command
in-position
signal

OFF: Outside in-position

range

ON: Within in-position

range

 This signal turns ON when the remaining distance falls within the

"command in-position range" set in the parameter.

 This signal turns OFF when the axis of the corresponding operation

moves.

 A command in-position check is performed every 56.8ms during position

control.
During speed control or during speed control of speed/position changeover
control, a command in-position check is not performed. (*

)

RX(n+1)F
RX(n+4)F

Axis 1
Axis 2

Zero point
return
request flag

OFF: Machine zero point

return complete

ON: Machine zero point

return being
requested

 This flag turns ON when any of the following conditions occurs, and turns

OFF at completion of a machine zero point return. (*

)

(a) When the drive unit READY signal turns OFF
(b) When the remote station READY signal turns ON
(c) When a machine zero point return starts

RX(n+2)0
RX(n+5)0

Axis 1
Axis 2

Zero point
return
complete
flag

OFF: Before machine

zero point return
completion

ON: After machine zero

point return
completion

 This flag turns ON at normal completion of a machine zero point return.
 This flag turns OFF at a machine zero point return start, positioning

operation start, JOG operation start or manual pulse generator operation
start or when the drive unit READY signal turns OFF. (*

)

RX(n+2)1
RX(n+5)1

Axis 1
Axis 2

Warning
detection

OFF: Without axis warning
ON: With axis warning

 This signal turns ON when an axis warning occurs.
 This signal turns OFF when the axis error is reset. (*1)

RX(n+2)2
RX(n+5)2

Axis 1
Axis 2

Speed
change 0
flag

OFF: New speed value is

other than 0

ON: New speed value is

 This signal turns ON when Speed change request (RY(n+2)7, RY(n+4)7)

is turned ON at a new speed value of 0.

 This signal turns OFF when Speed change request is turned ON at a new

speed value of other than 0. (*

)

RX(n+2)3
RX(n+5)3

Axis 1
Axis 2

Zero point
absolute
position
overflow flag

OFF: Overflow not

occurred

ON: Overflow occurred

 This signal turns ON when the zero point absolute position (*

) has

overflown due to a current value change. (*

)

RX(n+2)4
RX(n+5)4

Axis 1
Axis 2

Zero point
absolute
position
underflow
flag

OFF: Underflow not

occurred

ON: Underflow occurred

 This signal turns ON when the zero point absolute position (*

) has

underflown due to a current value change. (*

)

RX(n+2)5
RX(n+5)5

Axis 1
Axis 2

ABS data bit
0

OFF: bitOFF
ON: bitON

 This signal indicates the low-order bit of ABS data. (*

)

RX(n+2)6
RX(n+5)6

Axis 1
Axis 2

ABS data bit
1

OFF: bitOFF
ON: bitON

 This signal indicates the high-order bit of ABS data. (*

)

RX(n+2)7
RX(n+5)7

Axis 1
Axis 2

Transmissio
n data
READY flag

OFF: Trans-mission data

being prepared

ON: Trans-mission data

ready

 This signal indicates the preparation condition of transmission data in the

ABS transfer mode. (*

)

RX(n+2)8
RX(n+5)8

Axis 1
Axis 2

Restart
acceptance
complete flag

OFF: Restart not accepted
ON: Restart accepted

 This signal indicates a restart acceptance condition.

Initial data processing request

RX(n+7)8 Initial data

processing request

OFF: No initial data

processing request

ON: Initial data

processing being
requested

 After power-on or after a hardware reset, the D75P2 turns ON Initial data

request to request initial data setting.
This signal turns OFF when Initial data processing complete (RY(n+7)8)
turns ON.

n: Address assigned to the master module by station number setting
*

: Updated every 56.8ms. (Not update when processing is completed within 56.8ms.)

: Refer to section 12.6 for the zero point absolute position.

: Used for maintenance of the absolute position detection system. Unusable for normal operation.