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MELSEC-
A
12 CONTROL AUXILIARY FUNCTIONS
Example 1
(1) The conditions for calculation of the positioning address are indicated below.
Movement amount per pulse: 0.1 ( m)
Zero point address: 0.0 ( m)
Number of feedback pulses: 8192 (pulse)
(2) Calculate the upper and lower limit values of the positioning address that can
be specified from the range of using the number of output pulses in Condition
1 and the expression of calculating the positioning address (Expression 1).
Lower limit value of positioning address (calculated with the number of
negative side pulses in Condition 1)
(Positioning address) = (movement amount per pulse)
(number of output
pulses) + (zero point address)
= 0.1
(–268435456) + 0.0
= –26843545.6 (
m)
Upper limit value of positioning address (calculated with the number of
positive side pulses in Condition 1)
(Positioning address) = (movement amount per pulse)
(number of output
pulses) + (zero point address)
= 0.1
–268435455 + 0.0
= 26843545.5 (
m)
(3) The calculated upper and lower limit values of the positioning address are
within the range of Condition 2.
Hence, the positioning range calculated in Condition 1 [–26843545.6 (
m) to
26843545.5 (
m)] can be used in the absolute position detection system.
Positioning outside the range –26843545.6 (
m) to 26843545.5 ( m) cannot
be used in the absolute position detection system.
Zero point
0
-26843545.6 26843545.5
Range usable in absolute position
detection system
Range unusable
in absolute position
detection system
-214748364.8 214748364.7
Range unusable in
absolute position
detection system
Unit: m
Example 2
(1) Calculate the positioning address that can be specified in the system where
the zero point address in Example 1 is 214740000.0 (
m).
Lower limit value of positioning address
(Positioning address) = 0.1
(–268435456) + 214740000.0
= 187896454.4 (
m)
Upper limit value of positioning address
(Positioning address) = 0.1
(–268435456) + 214740000.0
= 187896454.4 (
m)
(2) Since the calculated lower limit value of the positioning address is within the
range of Condition 2, the calculated address 187896454.4 (
m) is the lower
limit for the positioning to be performed in the absolute position detection
system.
Since the calculated upper limit value of the positioning address is outside the
range of Condition 2, the upper limit value 214748364.7 (
m) of the positioning
range of Condition 2 is the upper limit for the positioning to be performed in the
absolute position detection system.
In the absolute position detection system, use the positioning address within
the range 187896454.4 (
m) to 214748364.7 ( m).
For positioning beyond 187896454.4 (
m), the positioning address cannot be
used in the absolute position detection system.
Unit: m
Setting disabled
241583545.5
(Zero point)
214740000.0
187896454.4
Range unusable in absolute
position detection system
Positioning address specifying range
214748364.7-214748364.8
Range usable in absolute
position detection system