FANUC Series 30i/300i/300is-MODEL A. Machining Center System. User's manual - page 259

A.PARAMETERS

APPENDIX

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As the size of the reference counter, specify the grid interval for the
reference position return in the grid method.
[Size of the reference counter]=[Grid interval]/[Detection unit]
[Grid interval]=[Amount of travel per rotation of the pulse coder]

The setting of a command multiplier is as follows:
(1) When command multiplier is 1 to 1/27

Set value = 1 / command multiplier + 100

Valid data range : 101 to 127

(2) When command multiply is 0.5 to 48

Set value = 2

command multiplier

Valid data range : 1 to 96

NOTE

If a feedrate exceeding the feedrate found by the
expression below is used, an incorrect travel
amount may result or a servo alarm may be issued.
Be sure to use a feedrate not exceeding the
feedrate found by the following expression:

Fmax[mm/min] = 196602

least command

increment / CMR

1821

Reference counter size for each axis

NOTE

When this parameter is set, the power must be
turned off before operation is continued.

[Input type] Parameter input

[Data type] 2-word axis

[Unit of data] Detection unit

[Valid data range] 0 to 999999999

Set a reference counter size.
As a reference counter size, specify a grid interval for reference
position return based on the grid method.
When a value less than 0 is set, the specification of 10000 is assumed.
When a linear scale with absolute address reference marks is used, set
the interval of mark 1.

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A.PARAMETERS

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1828

Positioning deviation limit for each axis in movement

[Input type] Parameter input

[Data type] 2-word axis

[Unit of data] Detection unit

[Valid data range] 0 to 99999999

Set the positioning deviation limit in movement for each axis.
If the positioning deviation exceeds the positioning deviation limit
during movement, a servo alarm (SV0411) is generated, and operation
is stopped immediately (as in emergency stop).
Generally, set the positioning deviation for rapid traverse plus some
margin in this parameter.

1829

Positioning deviation limit for each axis in the stopped state

[Input type] Parameter input

[Data type] 2-word axis

[Unit of data] Detection unit

[Valid data range] 0 to 99999999

Set the positioning deviation limit in the stopped state for each axis.
If, in the stopped state, the positioning deviation exceeds the
positioning deviation limit set for stopped state, a servo alarm
(SV0410) is generated, and operation is stopped immediately (as in
emergency stop).

1838

Position deviarion limit for each axis in moving during safety check

NOTE

When this parameter is set, the power must be
turned off before operation is continued.

[Input type] Paramete input

[Data type] 2-word axis

[Unit of data] Detection unit

[Valid data range] 0 to 99999999

Position deviation limit for each axis during moving for safety check
of Dual Check Safety function is specified.
If position deviation of a moving axis exceeds position deviation limit
while Safety Check is carried out (Safety Monitoring Request
“*VLDVx” =0), a servo alarm SV0475 or SV1071 is generated and
axes are stopped immediately like emergency stop state..
In Dual Check Safety function, positin deviation is always checked by
CNC and Servo. In case that Safety Check is carried out (Safety
Monitoring Request “*VLDVx” =0), the servo alarm SV0475 or
SV1071 is generated when each CPU finds out that the deviation
exceeds position deviation limit in moving state.

A.PARAMETERS

APPENDIX

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1841

Position deviation limit of each axis in moving state during other than Dual Check

Safety monitoring (for Dual Check Safety Function)

NOTE

When this parameter is set, the power must be
turned off before operation is continued.

[Input type] Parameter input

[Data type] 2 word axis

[Unit of data] Detection unit

[Valid data range] 0 to 99999999

Set the positioning deviation limit in moving state for each axis for
Dual Check Safety function, in case that Safety Check is not carried
out (Safety Monitoring Request “*VLDVx”=1).
In case that Safety Check is not carried out (Safety Monitoring
Request “*VLDVx” =1), servo alarm (SV0475,SV1071) is generated
and operation is stopped immediately (as in emergency stop), when
each CPU finds out that the deviation exceeds position deviation limit
in moving state.
If the value of this parameter is “0”, the parameter No.1828 is used for
the value of deviation limit in moving state.
In case that Safety Check is carried out (Safety Monitoring Request
“*VLDVx” =0), the parameter No.1838 is used for the value of
deviation limit in moving state.

1851

Backlash compensating value for each axis

[Input type] Parameter input

[Data type] Word axis

[Unit of data] Detection unit

[Valid data range] -9999 to 9999

Set the backlash compensating value for each axis.
When the machine moves in a direction opposite to the reference
position return direction after the power is turned on, the first backlash
compensation is performed.

1882

Interval of mark 2 of a linear scale with absolute address reference marks

NOTE

When this parameter is set, the power must be
turned off before operation is continued.

[Input type] Parameter input

[Data type] 2-word axis

[Unit of data] Detection unit

[Valid data range] 0 to 999999999

Set the interval of mark 2 of a linear scale with absolute address
reference marks.

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A.PARAMETERS

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1883

Distance 1 from the scale zero point to reference position (linear scale with

absolute address reference marks) or

distance 1 from the base point to reference position (linear scale with an

absolute address zero point)

NOTE

When this parameter is set, the power must be
turned off before operation is continued.

[Input type] Parameter input

[Data type] 2-word axis

[Unit of data] Detection unit

[Valid data range] -999999999 to 999999999

1884

Distance 2 from the scale zero point to reference position (linear scale with

absolute address reference marks) or distance 2 from the base point to

reference position (linear scale with an absolute address zero point)

NOTE

When this parameter is set, the power must be
turned off before operation is continued.

[Input type] Parameter input

[Data type] 2-word axis

[Unit of data] Detection unit

[Valid data range] -999 to 999

When a linear scale with absolute address reference marks is used, set
the distance from the scale zero point to reference position in
parameter Nos. 1883 and 1884).

Distance from the zero point to the reference position of a linear
scale
= No. 1884

1,000,000,000 + No. 1883

The scale zero point represents a point where mark 1 and mark 2
match. Usually, this point is a virtual point that does not physically
exist on the scale. (See the figure below.)
If the reference position is placed in the + direction when viewed from
the scale zero point, set a positive value. If the reference position is
placed in the - direction when viewed from the scale zero point, set a
negative value.

A.PARAMETERS

APPENDIX

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Mark 1 Mark 2

Mark 1

Mark 2

Zero point of encoder

Encoder end

Reference position

……..

Mark 1 = mark 2

41.8

8.2

42.0

8.0

Parameter No.1821

Parameter No.1882

Parameter No.1884

1,000,000,000 + Parameter No.1823

[Example of parameter settings] When an encoder as shown below is used with an IS-B, millimeter

machine:

20.000

19.980

9.940

10.060

9.960

10.040 9.980 10.020

5.000

20.000mm

20.020mm

-[9960/(20020-20000)*20000+5000] =

-9965000

Mark 1

Mark 2

Mark 1

Mark 2

Mark 1

Mark 2

Mark 1

Mark

Mark 2

Mark 1 = mark 2

Scale zero point

+ direction

- direction

Reference

position

Parameters

No.1821 (interval of mark 1)

= 20000

No.1882 (interval of mark 2)

= 20020

No.1883 (reference position) = position of point A + 5.000
= distance between A and B/(mark 2

−

mark 1)

mark 1 + 5000

= 9960/(20020-20000)

20000 + 5000

= 9965000
= -9965000 (the reference position is on the negative side)

[Setting parameter No. 1883]
When it is difficult to measure the distance from the scale zero point
to the reference position (parameter No. 1883), the method described
below can be used to find the distance.

<1> Set parameter No. 1815 to enable this function.

Set an appropriate value in parameter No. 1821 and No. 1882.

Set 0 in parameter No. 1240.

Set 0 in parameter No. 1883 and No. 1884.

<2> At an appropriate position, establish a reference position.

(As a result, the machine coordinate represents the distance from
the scale zero point to the current position.)

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<3> By jog feed or handle feed, place the machine at the accurate

reference position.

<4> In parameter No. 1883, set the machine coordinate of that time

converted to the detection unit (machine coordinate

CMR).

<5> If necessary, set parameter No. 1240.

When a linear scale with an absolute address zero point is used, set the

distance from the base point to the reference position in parameter
Nos. 1883 and 1884. The base point is a point at a scale end as shown
below.

If the reference position is located in the positive direction when

viewed from the base point, set a positive value; if the reference
position is located in the negative direction, set a negative value. Set
the value by following the steps explained below.

<1> Set bit 1 (OPT) of parameter No. 1815 , bit 2 (DCL) of parameter

No. 1815, and bit 3 (SDC) of parameter No. 1818 to enable this
function.
Set 0 in parameter No. 1240.
Set 0 in parameter No. 1883 and No. 1884.

<2> At an appropriate position, establish a reference position.

(Consequently, the machine coordinate value indicates the
distance from the base point to current position.)

<3> By jog feed or handle feed, place the machine at the accurate

reference position.

<4> In parameters Nos. 1883 and 1884, set the machine coordinate of

that time converted to the detection unit (machine coordinate

CMR).

If necessary, set parameter No. 1240.

NOTE

1 Set parameter Nos. 1883 and 1884 so that the distance from the scale zero point

(for a linear scale with absolute address reference marks) or the base point (for a
linear scale with an absolute address zero point) to the reference position is within
the range from -999,999,999,999 to +999,999,999,999. If a value beyond this range
is set, an alarm (PS 5325) is issued.

2 The scale area on the scale cannot be extended across the scale zero point or

base point. Make parameter settings not to cause the scale area to extend beyond
the scale zero point or base point.

Mark 1

Mark 2

Mark 1

Mark 2

Mark 1

Mark 1 Mark 2

Reference position

10.020

9.980

10.040

9.960

10.060 9.940

Base point

20.000

20.020

A.PARAMETERS

APPENDIX

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#7 #6 #5 #4 #3 #2 #1 #0

1902

ASE

FMD

[Input type] Parameter input

[Data

type]

Bit

NOTE

When at least one of these parameters is set, the
power must be turned off before operation is
continued.

# 0

FMD

The FSSB setting mode is:

0: Automatic setting mode.

(When the relationship between an axis and amplifier is defined
on the FSSB setting screen, parameter Nos. 1023, 1905, 1936 to
1939, and 14340 to 14407 (plus parameter Nos. 14408 to 14425
and 14444 to 14459 if an additional axis board is attached) are
automatically set.

1: Manual setting 2 mode.

(Parameter Nos. 1023, 1905, 1936 to 1939 and 14340 to 14407
(plus parameter Nos. 14408 to 14425 and 14444 to 14459 if an
additional axis board is attached) are to be manually set.)

# 1

ASE

When automatic setting mode is selected for FSSB setting (when the

FMD parameter (bit 0 of parameter No.1902) is set to 0), automatic
setting is:
0: Not

completed.

1: Completed.
This bit is automatically set to 1 upon the completion of automatic
setting.

#7 #6 #5 #4 #3 #2 #1 #0

1905

PM2

PM1

PM4

PM3

[Input type] Parameter input

[Data type] Bit axis

NOTE

When at least one of these parameters is set, the
power must be turned off before operation is
continued.

# 1

PM3

The third separate detector interface unit is:

0: Not

used.

1: Used.

# 2

PM4

The fourth separate detector interface unit is:

0: Not

used.

1: Used.

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A.PARAMETERS

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# 6

PM1

The first separate detector interface unit is:

0: Not

used.

1: Used.

# 7

PM2

The second separate detector interface unit is:

0: Not

used.

1: Used.

NOTE

When automatic setting mode is selected for FSSB
setting (when the parameter FMD (No.1902#0) is
set to 0), this parameter is automatically set when
input is performed with the FSSB setting screen.
When manual setting 2 mode is selected for FSSB
setting (when the parameter FMD (No.1902#0) is
set to 1), this parameter must be set directly. When
a separate detector interface unit is used, a
connector number must be set in the
corresponding parameter (No.1936, No.1937,
No.1938, or No.1939).

1936

Connector number of the first separate detector interface unit

1937

Connector number of the second separate detector interface unit

1938

Connector number of the third separate detector interface unit

1939

Connector number of the fourth separate detector interface unit

NOTE

When these parameters are set, the power must be
turned off before operation is continued.

[Input type] Parameter input

[Data type] Byte axis

[Valid data range] 0 to 7

Set the connector numbers corresponding to connectors to be
connected when the separate detector interface unit set by bit 1, 2, 6,
or 7 of parameter No. 1905 is used. The values to be set are indicated
below.
Within one separate detector interface unit, use connector numbers
sequentially. No intermediate number may be omitted.

Correspondence between connectors and connector numbers

Connector Connector

number

JF101 0
JF102 1
JF103 2
JF104 3
JF105 4
JF106 5

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