8-57
8.4.18 Pulse Output Instruction Flag
- Note that there are the following restrictions on using each function of the pulse output
Allocation and role of pulse output instruction flag
- When a pulse output instruction (F171/F172/F174/F175/F177) or PWM output instruction (F173) is
executed and pulses are being output, the pulse output instruction flag of the corresponding channel is
ON. No other pulse output instruction can be executed as long as this flag is ON.
- The pulse output instruction flags are allocated to each channel.
Pulse output instruction flag
Operation of pulse output instruction flag
- The pulse output instruction flags vary even during scanning. Replace them with internal relays at the
beginning of the program when using them several times in the program.
8.4.19 Common Precautions for Pulse Output Instructions
- Note that there are the following restrictions on using each function of the pulse output
Precautions when using instructions in PULSE+SIGN mode (Common to F171, F172, F175, F177)
- When each instruction is executed, pulses are output approx. 300µs after the direction signal has been
output; the motor drive characteristics are simultaneously taken into consideration.
Stop by pulse output control instruction (F0) (Common to F171, F172, F174, F175, F177)
- When executing the deceleration stop with the pulse output control instruction (F0), the operations
being executed with various instructions are cancelled and the deceleration operation starts. When the
deceleration stop request flag (bit 5 of DT90052) is on, instructions cannot be executed. As for the data
table control instruction (F174), the operation is similar to that of the forced stop.
- When executing the forced stop (pulse output stop) with the pulse output control instruction (F0), the
operations being executed with various instructions are cancelled and the pulse output is immediately
stopped. When the forced stop request flag (bit 3 of DT90052) is one, instructions cannot be executed.
Specification of initial speed and speed error (Common to F171, F172, F174, F175, F177)
- Note that there are the following characteristics according to the initial speed specified with each
instruction.
(1) When the initial speed is 1 Hz or higher, and lower than 46 Hz, the control can be performed up to 10
kHz.
(2) When the initial speed is 46 Hz or higher, and lower than 184 Hz, the control can be performed up to
the maximum frequency.
(3) When the initial speed is 184 Hz or higher, the control can be performed up to the maximum
frequency. The speed error will be smallest.
Control code and quick start (Common to F171, F172, F175)
- When "Calculation only" is specified in the digit to set the output of the control code of each instruction,
the pulse output is not performed.
- Instructions can be quickly started when executing them for the same channel and with the same
parameter after executing calculation only.
Duty cycle of pulse output (Common to F171, F172, F174, F175, F177)
- Pulses are output with a 25% duty cycle.
To Next Page
Loading...
