12CONTROL SUB FUNCTIONS

Example 2.

MELSEC-Q

(1)Using Expression 1, calculate the positioning address which can be specified in the system where the OP 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

=241583545.5 (m)

(2)Since the lower limit value of the positioning address calculated is within the range of Condition 2, the calculated address 187896454.4 (m) is the lower limit for positioning in the absolute position detection system.

Since the upper limit of the positioning address calculated is outside of the range of Condition 2, the upper limit value 214748364.7 (m) is the upper limit for positioning 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).

Positioning in excess of 187896454.4 (m) cannot be used in the absolute position detection system.

Unit: m

-214748364.8

Positioning address specifying range

214748364.7

 

 

 

 

(OP)

 

187896454.4

214740000.0

241583545.5

Unusable range in absolute

Usable range in absolute

Setting disallowed

position detection system

position detection system

Example 3.

(1)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)

(2)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)

12 - 56

Page 532
Image 532
Mitsubishi Electronics QD75P, QD75D user manual Usable range in absolute