Fuji Electric micrex-sx NP1F-MP1, Руководство пользователя

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7-32
7-4 Functions of the Position Command Mode
7-4-1 Positional deviation calculation
The operation of this function in the position command mode is shown below:
Positional deviation calculation
Pulse generator
(step command)
Command pulse
Feedback pulse
6) Count pulse select
Signal
select
Calculation
of
increment
Calculation
of
set value
Frequency data
Pulse count data
1) Position data
Feedback pulse
Deviation counter
2)
4)
3)
5)
1) Position data
• This is position command data sent from the CPU module (the number of pulses).
Position data is set in the upper word in the set value data area (one-word signed data).
2) Calculation of increment
• From the set value for position data which is sent from the CPU module, pulses for the increment and current
command position are calculated.
Pulses for the increment = Current set value - Previous set value
Increment is calculated each time data is received from the CPU module.
3) Calculation of set value
• The data which is to be set in the target frequency register is calculated.
• This module measures the time interval for receiving each time data is received from the CPU module.
The set value is calculated so that all the pulses which are set as the increment can be output within the time
interval for data receiving.
4) Pulse generator
• Outputs command pulses for positioning.
5) Deviation counter
• Calculates feedback pulse input.
6) Signal select
• Selects the command pulse signal or feedback pulse signal and outputs the selected signal to the current value
counter.
When feedback pulse select is enabled, the feedback pulse is selected.
When feedback pulse select is disabled, the command pulse is selected.
• When feedback pulse select is disabled, the command pulse signal is input to the deviation counter as a command
pulse as well as feedback pulse. (In this case, the deviation amount is always “0.”)