Omron FQM1-MMA21 Section, Circular Mode Operation, Single-rotationspeed control pattern

Pulse Outputs Section 7-6

Circular Mode Operation

A speed control pattern can be repeated in continuous speed control to con- trol a series of repetitive operations at specific positions. For example, the fol- lowing diagram shows an axis that repeatedly switches to low-speed operation at one position and switches to high-speed operation at another position. Since the speed control pattern must repeat in these applications, a counter cannot be used if it is reversible.

Single-rotation speed control pattern

High-speed region

Low-speed

0region

Pulse output PV

Target value 2

Target value 1

Time

Speed

(frequency)

High-speed region

Low-speed region

Controlled by ACC instruction.

Time

7-6-10 Range Comparison Bit Pattern Outputs from Pulse Output PVs

Bit patterns can be output internally in the Auxiliary Area when the pulse out- put PV is within a specified range.

The processing of the range-comparison bit pattern outputs for pulse output PVs is the same as the processing for high-speedcounter PVs, so refer to Checking for High-speed Counter Interrupts under High-speed Counter Func- tion Description in 7-5-8 Pulse Input Function Description for details.

7-6-11 Acceleration/Deceleration Rates in ACC(888) and PLS2(887) Instructions

The acceleration/deceleration rate’s speed-change cycle can be set to either 1 ms or 2 ms for the ACC(888) and PLS2(887) instructions. The same speed-change cycle setting applies to both pulse output 1 and 2 and both the ACC(888) and PLS2(887) instructions.

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