Mitsubishi Electric MELSEC-L LD75P User Manual page 573

3
Ex.
• There are the following conditions to calculate the positioning address:
Movement amount per pulse: 0.9 (m)

OP address: 0.0 (m)

Feedback pulses = 8192 (pulse)

• Calculate the positioning address from the output pulse count using range in Condition 1 and the
positioning address calculation expression (Expression 1).
Lower limit value of positioning address (the number of negative pulses in Condition 1 is used for

calculation)
(Positioning address)
= (Movement amount per pulse)  (Number of output pulses) + (OP address)
= 0.9  (-268435456) + 0.0
= -241591910.4 (m)
Upper limit value of positioning address (the number of positive pulses in Condition 1 is used for

calculation)
(Positioning address)
= (Movement amount per pulse)  (Number of output pulses) + (OP address)
= 0.9  268435455 + 0.0
= 241591909.5 (m)
• Since the upper/lower limit values of the positioning address calculated are outside of the range of
Condition 2, use the positioning address within the positioning range of Condition 2 (-214748364.8 to
214748364.7 (m)).
-241591910.4
(e) Concept for the unit of degree
• The positioning address is within the range 0 to 359.99999 at the position to which a machine OPR was
made. When the OP position is not 0, the range is also 0 to 359.99999.
• For positioning in the same direction, control from maximum to minimum (for address increase:
359.99999 to 0/for address decrease: 0 to 359.99999) cannot be exercised. ( Figures below)
Unusable in absolute position detection system.
Current value cannot be restored
properly at power supply on or resetting.
• When positioning is to be used in the absolute position detection system, set the upper/lower limit values
of the software stroke limit within the range 0 to 359.99999.
-214748364.8
Setting disallowed Usable range in absolute position detection system
OP
359.99999 359.99999
0
CHAPTER 12 CONTROL SUB FUNCTIONS
OP
0
214748364.7
Unusable in absolute position detection system.
0
Current value cannot be restored properly at
power-on or reset.
Usable range in absolute position detection system
(0 to 359.99999 )
Unit: µm
241591909.5
Setting disallowed
571
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