IDEC MicroSmart User Manual

Page 356

20: P

ULSE

NSTRUCTIONS

20-28

« FC4A M

ICRO

MART

SER

’

ANUAL

Sample Program: ZRN1

This program demonstrates a user program of the ZRN1 instruction used for zero-return operation to generate output
pulses of 3 kHz initial pulse frequency from output Q0 while input I1 is on. When deceleration input I3 is turned on, the
output pulse frequency reduces to the creep pulse frequency of 800 Hz. When deceleration input I3 is turned off, ZRN1
stops generating output pulses.

Initial pulse frequency:

3,000 Hz

Creep pulse frequency:

800 Hz

Deceleration input:

I3 (high-speed deceleration input)

Operand Settings

Operand

Function

Description

Allocation No. (Value)

S1+0

Initial operation mode

Frequency range 100 to 10,000 Hz

D0 (1)

S1+1

Initial pulse frequency

10,000 Hz

× 30% = 3,000 Hz

D1 (30)

S1+2

Creep operation mode

Frequency range 10 to 1,000 Hz

D2 (0)

S1+3

Creep pulse frequency

1,000 Hz

× 80% = 800 Hz

D3 (80)

S1+4

Error status

Deceleration input

High-speed deceleration input

D1+0

Pulse output ON

0: Pulse output OFF
1: Pulse output ON

M100

D1+1

Pulse output complete

0: Pulse output not complete
1: Pulse output complete

M101

M8120

M8120 is the initialize pulse special internal relay.

When the CPU star ts, four MOV(W) instructions store parameters to data
registers D0 through D3.

D0 (initial operation mode): 1 (100 to 10,000 Hz)

D1 (initial pulse frequency): 30 (10,000 Hz

× 30% = 3,000 Hz)

D2 (creep operation mode): 0 (10 to 1,000 Hz)

D3 (creep pulse frequency): 80 (1,000 Hz

× 80% = 800 Hz)

Pulse output ON flag M100 is turned off.

Pulse output complete flag M101 is turned off.

When star t input I1 is turned on, ZRN1 star ts to generate output pulses
from output Q0.

REP

S1 –

MOV(W)

D1 –

REP

S1 –

MOV(W)

D1 –

REP

S1 –

MOV(W)

D1 –

REP

S1 –

MOV(W)

D1 –

M100

ZRN
1

S1
D0

M100

M101