Mitsubishi FX3G Series User Manual page 139

FX /FX /FX PLC User's Manual - Positioning Control Edition
3G 3U 3UC
Built-in Positioning Functions
3) For , specify the near-point signal (DOG) input device number ( NO contact).
S
3
Turning on the near-point signal will reduce the speed to the creep speed. Turning off the near-point
signal will complete the zero return operation.
• If an input (X000 to X007) of the main unit is specified for the input signal, the PLC interruption function
will be used to stop the operation. (To output the CLEAR signal, turn on the "CLEAR signal output
function enable" relay.)
Under the following condition, however, operation may be affected by the input constant or the scan
time of the sequence program, and the operation, therefore, may not be stopped exactly at the origin.
-An input number of X010 or below (or other device (auxiliary relay, etc.)) is specified.
• If an input relay X010 or higher is specified for the near-point signal, the input filter (10 ms) will be
applied.
4) For , specify a pulse output number in the range of Y000 to Y003.
D
5) Zero return direction
For this instruction, the zero return direction is set to the reverse rotation direction.
(During zero return operation, the value indicated in the current value register will be decreased.)
To perform zero return in the forward rotation direction
direction output.
a) Turn on Y
b) Refresh Y
c) Execute the ZRN instruction (zero return instruction).
d) With the execution completion flag (M8029) of the ZRN instruction (zero return instruction), reset
Y (rotational direction signal).
Example program:
In the program shown below, Y004 is specified as the rotation direction signal output device for Y000.
Command
input
M8340
Y000 output
pulse monitor
*1. The pulses being output will always decrease the current value.
→ To use the main unit (transistor output), refer to Section 4.8.
→ To use a high-speed output special adapter, refer to Section 4.9.
(rotational direction signal).
output using the REF (FNC50) instruction.
FNC 50
REFP
FNC156
S
1•
DZRN
M8029
M8329
6 Mechanical Zero Return (DSZR/ZRN Instruction)
→ For details, refer to "1. Zero return operation".
*1
, follow the example program below to control the
→ For programming details, refer to Section 4.7.
RST M10
a)
RST M11
SET Y004
b)
Y000 K8
c)
S S Y000
2• 3•
d)
RST Y004
SET M10
Origin data reading completion flag
Resets the rotational direction signal
RST Y004
(Y004) using the instruction
execution abnormal end flag.
SET M11
Abnormal end of zero return
6.3 Zero Return (ZRN Instruction)
Turns on (sets) Y004 as the
rotational direction signal of Y000
(pulse output destination).
Refreshes Y000 to Y007.
Executes ZRN instruction.
Resets the rotational direction
signal (Y004) using the instruction
execution complete flag.
B - 101
A
B
Apx.