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MELSEC-Q
9 MAJOR POSITIONING CONTROL
Restrictions
A 0.9ms (QD75P
N /QD75D N) or 1.8ms (QD75P /QD75D ) error will occur in
the current value update timing when the stored "current feed value" is used in the
control.
A 0.9ms (QD75P
N /QD75D N) or 56.8ms (QD75P /QD75D ) error will occur
in the current value update timing when the stored "machine feed value" is used in
the control.
Monitoring the current value
The "current feed value" and "machine feed value" are stored in the following
buffer memory addresses, and can be read using a "DFRO (P) instruction" or
"DMOV (P) instruction" from the CPU module.
Buffer memory addresses
Axis 1 Axis 2 Axis 3 Axis 4
Md.20
Current feed value
800, 801 900, 901 1000, 1001 1100, 1101
Md.21
Machine feed value
802, 803 902, 903 1002, 1003 1102, 1103
(1) The following shows the examples of programs to read out the current feed
value of the axis 1 to D104 and D105 when X40 is turned ON.
(a) For the DFRO(P) instruction
(b) For the DMOV(P) instruction
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