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FX Series Programmable Controlers
5.13.7
ZRN (FNC 156)
Mnemonic
ZRN
FNC 156
Zero return
16 BIT OPERATION
M0
ZRN K1000 K100
machine position. However when the power to the PLC is turned off, this data is lost. To cope
with this the machine should return to the zero point when the power is turned ON, or during
initial set up, to teach the zero position.
[S
] is the Zero Return Speed, [S
1
the Pulse Output Designation.
Points to note:
a)Users may specify zero return speed [S
b)Users may specify the creep speed [S
c)If any device other than an input relay (X) is specified for the Near point signal [S3] it will be
affected by the operation cycle of the PLC and the dispersion of the zero point may be large.
d)Only Y000 or Y001 can be used for the pulse output [D].
Because of the nature of the high speed output, transistor type output units should be used
with this instruction. Relay type outputs will suffer a greatly reduced life, and will cause false
outputs to occur.
To ensure a 'clean' output signal when using transistor type units, the load current should be
200mA or higher with the FX2N Series. The load current should be 10 - 100mA with the FX1S/
1N Series. It may be necessary to use 'pull up' resistors.
e)If M8140 is set to ON, the clear signal is sent to the servo motor when the return to zero point
is complete.
f)Related device numbers.
D8141 (upper digit) & D8140 (lower digit) : Current value register of Y000 (32-bit)
D8143 (upper digit) & D8142 (lower digit) : Current value register of Y001 (32-bit)
D8147 (upper digit) & D8146 (lower digit) : Maximum speed when FNC156, FNC158 or
FNC159 are executed 100~100,000Hz.
D8148 : Acceleration/Deceleration time adopted when FNC156, FNC158 or FNC159 are
executed.
Function
Return to zero home
K,H,KnX,KnY,
point after machine
KnM,KnS
ON or initial setting.
T,C,D,V,Z
32 BIT OPERATION
[S
]
[S
]
[S
]
[D]
1
2
3
X003
Y000
] is the Creep Speed, [S
2
Operands
S
S
S
1
2
X,Y,
M,S
PULSE-P
Contents:
W h e n e x e c u t i n g i n c r e m e n t a l o r a b s o l u t e
positioning, the PLC stores the current position
va l u e s w h i c h in c r e a s e o r d e c r e a s e d u r in g
operation.
Using these values, the PLC always knows the
] is the Near Point Signal, and [D] is
3
] as, 16-bit 10 to 32,767Hz or 32-bit 10 to 100kHz.
1
} of 10 to 32,767Hz
2
Applied Instructions 5
FX
FX
FX
1S
1N
Program steps
D
3
ZRN:
Y
9 steps
Note:
DZRN:
Y000 or
17 steps
Y001 only
5-165
FX
2N
2NC
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